O r d e r A c a r id e a .
There is work yet to be done under this order. The following
have, however, been added to Mr. Walker’s l i s t :—
Acarus, Linn.
A . d om e s t i c u s .—The Cheese-mite.
Ixodes? Latr.
I . p lu m b e u s ?—Cow-tick.
Leptus? Latr.
L . a u tu m n a l i s ?—This “ Hay-bug,” as it is called, is larger in
size and deeper in colour than the English Harvest-bug, and may
therefore be quite different. I t is abundant during hay time, and
has yet to be identified.
C LA S S V .— A N N E L ID A .
The late Dr. W. Baird described the following species of Earthworms
in the “ Linnean Society’s Journal: Zoology,” vol. xi. 1871.
Lumbricus, Linn.
* L . r u b r o - f a s c i a tu s , Baird.—About 2 to 3 inches in length, of
a dirty yellowish colour, banded across the back with a broad fascia
o f a red hue.
Megascolex, Temple.
*M . (P e r i c h a e t a ) S a n c ta e h e l e n a , Baird.— From 1 to 3 inches
in length, of a dull red colour, with 86 rings about the body. both
species inhabit the earth in moist situations on the high land. At
certain times in the year they may be seen lying in a dead and
half dying state on the hard surface of the roadways.
V. ANNULOIDA,
C LA S S I .— S C O L E C ID A .
There is yet work to be accomplished, more than I have been
able to do, in this branch; but, so far, the following will embrace
pretty nearly the most abundant species of the Echinodermata.
C L A S S I I .— E C H IN O D E R M A T A .
O r d e r E c h t n id e a (or Sea-urchins).
Cidaris, Klein.
*C. m e t u l a r i a , Lamck.—The thick-spined Sea-Egg of th e
Island is taken from deep water round the coast. I t is found
also at the Mauritius, the Seychelles, and St. Domingo. There are
two varieties of this species found at St. Helena.
Echinometra, Breyn.
* E . a c u f e r a , Blainville:—The common thin-spined, black Sea-
Egg, which abounds on the rocky coast all along the sea-shore just
below high-water mark. This creature bores a hole in the solid
basaltic rock sufficiently deep to protect itself. I t occurs also at
Ascension Island, Yera Cruz, Martinique.
There is a third, a very fine-spined Sea-urchin, the fragments of
which I have picked up occasionally on the windward sea-coast, but
I never obtained a complete specimen.
O r d e r A s t e r id e a (or Star-fishes).
Asterina, Gray.
*A . m i n u t a ?— A small greenish Star-fish, found abundantly
sticking close to the rocks around the sea-coast, about high water
mark.
O r d e r O ph it jr id e a (or Sand-stars).
Echinaster, Gray.
* E . sp. ?—A bright orange-coloured Sea-star. This brilliant
creature may often be seen lying at the sea bottom near the shore,
at the depth of a fathom or two.
There are several species of sand-stars, some of them very large
and taken from deep water. I sent a collection of them to the
British Museum with the fishes, but as yet they have not been
examined.