Tail very long. Cerata long, set in 9 groups. Body yellowish white;
cerata olive with white tips. Radula uniseriate; 2D teeth; median cusp
short; 6—7 lateral denticles.
\TI&t'via Bergh 7 is distinguished from Cuthona merely by having the front of the
foot not rounded but with the corners produced into horn-like processes. This does not
seem sufficient as a generic character, and Hervia should probably be reckoned as only a
sub-genus. On the other hand it might be equally well described as a Ooryphella, with
a uniseriate radula. One species, H. modesta, is recorded from the north Atlantic
(Kattegat). The colour in life is unknown, in alcohol brownish. The cerata are set in
seven groups. The radula consists of twenty-one teeth, with a strongish central cusp
and twelve to fourteen lateral denticles.]
Genus 7. iEolidiella Bergh.
Bergh 12, pp. 7 - 1 2 ; 1 3 ,pp. 22—26; VayssiSre 1, pp. 107—111.
Body somewhat elongate and depressed. Cerata somewhat flattened. Corners of
foot produced into short processes. Rhinophores not perfoliate but sometimes transversely
wrinkled or furrowed. Jaws not denticulate. Teeth pectiniform, but divided
into two halves, and with a more or less developed median denticle. Ptyaline glands
present.
1. JEUa- glauca (A. & H.),s^-
{Pt. 4, Fam. 3, PI. 11.)
2. JElla- alderi (Cooes).
{Pt. 6, Fam. 3, PZ. TO.)
3. iEUa- angulata A. & H.
{Pt. 2, Fam. 3, PI. 23.)
See the description of this species, pp. 131—132.
4. sanguinea (Norman).
Norman, in Ann. Mag. Nat. Hist., 1877, On Two New British Nudibranchs.
“ Our new form comes nearest to E. glauca, from which it differs in its
more attenuated form, in its more numerous transverse rows of branchi®
and more numerous branchi® in those rows, in its more brilliant body-
colour and in its branchi® being blood-red instead of sage-green.” The
dentition is unknown.
One may doubt if these species are really distinct from one another or from JEolidiella
scemmeringii found in the Mediterranean.
Spurilla Bergh, which differs from JEolidiella only in having the rhinophores'
perfoliate, and Berghia Trinchese, in which they are perfoliate and also bear small knobs,
should probably be regarded as sub-genera of JEolidiella. In JEolidiella the rhinophores
are a little wrinkled, and it does not seem as if the greater development of these wrinkles
should constitute a generic difference.
For the occurrence of Berghia ccerulescens in British waters see Eliot 1, p. 357.
The specimen preserved at Plymouth under this name is really a Facelina coronata, but
Professor Garstang tells me that he believes the species does occur at Plymouth. There
is no reason why it should not, for it is reported to be plentiful at Arcachon and even at
St. Malo. See Cu&iot 2, pp. 8—9.
Genus 8. jEolidia Cuv.
Bergh 6, pp. 618—620; 7, pp. 695—696; 10, p. 822; 18, pp. 130—133; 50, p. 127; 51, p. 451;
Eliot, 5, pp. 351—352.
Body stoutish, flattened. Corners of foot slightly produced. Rhinophores smooth.
Cerata flattened. Anus dextro-dorsal. Jaws with smooth edges. Teeth simply pectinate
without any median cusp or division into two halves.
1. ^E. papillosa L.
{Pt. 6, Fam. 3, PI. 9.)
The three known species of JEolidia, namely this one, 2E. serotina (Chile and Falkland
Islands), and FE. herculea (California), show few decided differences and are perhaps merely
varieties.
y. SERRATE.
The radula is uniseriate, but the teeth are fused together so that it resembles
a jagged thread.
The researches of Mr. Evans make it probable that this group ought to receive the
rank of a separate family.
Genus 1. Calma A. & H.
Animal flattish. Cerata arranged in rows and sometimes arising from a pedestal.
No cnidocysts. Rhinophores simple. Anterior comers of foot produced into prolongations.
Genitalia unarmed, jaws not denticulate. Radula a continuous band not divided into
separate teeth, and merely bearing serrulations on the upper surface. Digestive system
much simpler and less ramified than is usual in the JBolididm. Renal organ also simple
and not ramified. Hermaphrodite gland symmetrically arranged on the two sides of
the body.1
* 1. C. glaucoides A. &. H.
(Pi. 6, Fam. 3, PI. 22; and Pi. 8, PI. V,fig. 8.)
1 Since the ab0TB ™ written Mr- Evans has discovered that G. glaucoides has neither intestine
nor anal opening, and that the male and female openings are separate as in Fiona. In view of these
discoveries, the animal shonld probably be made the type of a separate family, bnt the inform.*:™
was reoeived too late to make the necessary changes in the text of the present work,