Goree Island, Senegambia. 369 
the carapace and postabdomen, the number of the spines on 
the terminal segment, the existence of a spine on the carpus 
of the large raptorial limbs, in the form of the spines of the 
basal prolongation of the uropoda, &c. 
It scarcely differs, indeed, except in the somewhat less- 
elongated, slightly transverse rostral plate (which, as in the 
typical examples of C. acanthocarpus, has its anterior margin 
armed with a short spine, and its antero-lateral angles not 
prolonged into spines), its less prominent eyes, and in having 
the dactylus of the raptorial limbs armed with seven, not six, 
spines on their inner margins; the penultimate spine is also 
relatively not so short as in the two specimens of C. acantho- 
carpus above referred to; the small spinules on the latero- 
posterior margin of the terminal segment are somewhat more 
elongated. The example from Goree Island measures barely 
1 inch 4 lines (34 millim.), whereas the smallest (the type) 
specimen of C. acanthocarpus measures about 2 inches 6 lines 
(64 millim.); and in the absence of a larger series for compa- 
rison I do not venture to regard the distinctions above men- 
tioned as of specific value ; yet, in consideration of the widely- 
separated localities, it appears desirable to apply a distinct 
designation to the West-African variety. As in the typical 
form, the lamellate appendage of the antepenultimate joint is 
less dilated in the last pair of thoracic limbs than in the pre- 
ceding*. 
Lysiosquilla armata, Smith}, from the coast of New 
England, is a very distinct species from the foregoing, differ- 
ing (it would appear) in the form of the rostrum and terminal 
segment, as well as in having ten spines on the prehensile 
edge of the dactylus of the “ raptorial limbs ” (second maxil- 
lipedes). 
ISOPODA. 
Cirolana Swainsonii. 
Nelocira Swainsonit, Leach, Dict. Sci. Nat. xii. p. 347 (1818); Des- 
marest, Consid. Crust. p. 302, pl. xlvili. fig. 2 (1825) ; M.-Edwards, 
Cr. in Cuvier, Régne Anim., Atlas, pl. Ixvii. fig. 4. 
Eurydice Swainson, M.-Edwards, Hist. Nat. Crust. iii. p. 288 (1840) ; 
White, List Crust. Brit. Mus. p. 106 (1847). 
? Cirolana /urtipes, Heller, Verh. zool.-bot. Gesellsch. Wien, xvi. 
p. 742 (1866); Stalio, Atti Istit. Veneto (ser. 5), ili. p. 1875 
(1876-77). ; 
There are in the collection six small specimens that I refer 
* Vide Ann. & Mag. Nat. Hist. (ser. 5), v. p. 125 (1880). 
+ Proc. U.S. Nat. Mus. iii. p. 446 (1881). 
