KERGUELEN ISLAND. 279 
Gould ; a very peculiar whelk, Meoduccinum Eatoni, Smith; a 
Natica, NV. sculpta, v. Martens; and a Photinula, P. expansa, Sow., 
also known from the Crozets, South Georgia and the Falklands, 
where it is common. 
Crustacea are more numerous. The only species of crab found at 
Kerguelen is the little Halicarcinus planatus (Fabr.), which seems to 
be widely distributed throughout the Antarctic region, though a 
critical comparison of specimens from different localities is still to be 
desired. We here meet with the characteristic Isopod genus Serolis, 
represented by two species, one of which, S. latifrons (Miers), whose 
range extends to the Crozets and the Auckland Islands, occurs in 
great swarms in places where the bottom is sandy ; the other species, 
S. septemcarinata (Miers), known also from Marion Island and Prince 
Edward Island, is less abundant. Many other Isopods also occur, 
e.g. Sphwroma gigas, already alluded to; Cassidina emarginata, Gueér., 
a Magellan and Falkland Islands species ; C. maculata, Stud., possibly 
not distinct from the preceding (Stebbing, P.Z.S. 1900, p. 561); 
Aga semicarinata, Miers (similar to 4. serripes, M.E., from Péron’s 
voyage) ; etc. 
Bryozoa and Hydroids form numerous colonies on the Alge and 
the mussel-shells. A species of Pedicellina, P. Breusingi, Studer, 
deserves further study : it is supposed to be identical with P. australis, 
Ridley, from Magellan (P. Z. S. 1881, p. 61); a Pedicellina, in all 
probability the same, has also been mentioned by Joliet (C. R. 1879, 
p. 392) as occurring at St. Paul’s Island. Among the Hydroids we 
have, besides those already mentioned, Tubularia kerguelensis, Stud. ; 
Halecicum mutilum, Allm.; Hypanthea repens, Allm.; and two 
Sertularelle, viz. S. wnilateralis, Allm., and another which was at 
first described by Allman as S. kerguelensis, but afterwards referred 
by him to the widely distributed S. polyzonias, L. 
A small bright-red Nereis, NV. Hatoni, M‘Int., a Lumbriconereis 
perhaps indentical with the L. kerguelensis, Grube, found at greater 
depths, and a Polynoid, Hermadion magelhaense, Kbg., white with 
reddish-brown elytra, represent our knowledge of the Worms. 
Holothurians are abundant, especially Cucumaria crocea, Less., an 
orange-yellow species with brood-pouches for the young ; also Semperia 
parva, Ludw., and Chirodota Studeri, Théel. Ophioglypha brevispina, 
Smith, is a common brittle-star. Of Asterids we have here the six- 
rayed Asterias perriert, Smith ; also Porania antarctica, Smith; and 
lastly the remarkable Leptoptychaster kerguelensis, Smith, whose eggs 
develop in a cavity on its back, overarched by a roof of modified 
spines, 
