138 ON CRUSTACEANS FROM DUKE-OF-YORK ISLAND. ([Feb. 20, 
Cancer hydromus, Herbst, J. c. p. 16, pl. xli. fig. 2, 2 (1796). 
Cardisoma carnifex, Latr. Encycl. Méth. Hist. Nat. x. p. 685 
(1825) ; M.-Edw. Hist. Nat. Crust. ii. p. 23 (1837); A. M.-Edw. 
Nouv. Arch. Mus. Hist. Nat. ix. p. 264 (1873). 
In the single imperfect specimen (male) of this species in the 
collection a very small tooth exists at some distance behind the 
external orbital angle; the raised line defining the antero-lateral 
margins is continued but a short distance backward beyond this 
tooth; the left anterior leg is the larger; the ambulatory legs are 
clothed with long hairs. 
PAGURUS PUNCTULATUS. 
Pagurus punctulatus, Olivier, Encycl. Meth. viii. p. 641 (1811) ; 
M.-Edw. Hist. Nat. Crust. ii. p. 222 (1837). 
A single specimen of this very common species is in the collection, 
a female, inhabiting the shell of Doliwm perdiz. 
White, in the ‘List of Crustacea in the Collection of the British 
Museum,’ p. 60, adopts Herbst’s earlier name of Cancer megistos for 
this species; but, as the description and figure of C’. megistos are 
wanting in the only copy of Herbst’s work that I have seen, I retain 
for the present Milne-Edwards’s designation of Pagurus punctulatus, 
by which this species is generally known. 
PARRIBACUS ANTARCTICUS. 
Scyllarus antarcticus, Lund, Skrivt. Naturh. Selsk. Kjdben. 
Bd. ii. Heft 2, p. 22 (1793); Fabr. Ent. Syst. Suppl. p. 399 
(1798). 
Ibacus antarticus, M.-Edw. Hist. Nat. Crust. ii. p. 287 (1837). 
Parribacus antareticus, Dana, U.S. Expl. Exp. xiii. Crust. 1. 
p- 517, pl. xxxii. fig. 6 (1852). 
Two specimens, a male and a female, were collected. The male 
has the appendages (pleopoda) of the second and third abdominal 
segments much larger than those of the female, foliaceous, and equally 
developed; in those of the fourth and fifth segments the inner ramus 
is rudimentary. In the female the third, fourth, and fifth segments 
have the inner ramus of the appendages produced, substyliform, and 
two-jointed at its extremity. 
LySIOSQUILLA MACULATA. 
Squilla maculata, Fabr. Ent. Syst. ii. p. 511 (1793); Lamarck, 
Hist. Ann. sans Vert. v. p. 188 (1818) ; M.-Edw. Hist. Nat. Crust. 
ii. p. 518 (1837). 
Cancer (Mantis) arenarius, Herbst. Naturg. Krabben u. Krebse, 
ii. p. 96, pl. xxxiil. fig. 2 (1796). 
One specimen, a male, of this common Indo-Pacific species is in 
the collection. It is of rather small size (about 8 inches). This 
species, when fully grown, is probably the largest of the genus. 
