Goree Island, Senegambia. 365 
which does not reach the size of the Gorean specimens, which 
present all the characters of the typical form of S. arctus*. 
In two small specimens from Mr. Watson’s Madeiran col- 
lection, and in the one from the same locality referred to b 
me in my recent report on the Crustacea collected by Dr. 
Coppinger, of H.M.S. ‘ Alert,’ under the name of S. arctus f, 
the carapace is much depressed and nearly smooth, but little 
broader than long, with scarcely any trace of squamiform 
tubercles and the median dorsal teeth very low; the lateral 
- caring distinct, and reaching nearly to the posterior margin ; 
the lateral lobes of the second to fifth postabdominal segments 
are angulated, but the angies not produced into spines; there 
is a strong spine on the sternum, at base of each of the fifth 
pair of legs. I have little doubt that these belong to the 
species recently described by Prof. S. I. Smith under the 
name of S. depressus, the types of which were dredged in 
86 fathoms off the New-England coast t. 
Possibly, as Prof. Smith remarks, both the depressed form 
of the carapace and the prominence of the sternal spines may 
be due to immaturity. 
S. Gundlachi, von Martens, from Cuba §, appears to bear a 
considerable resemblance to S. arctus, var. paradoxus, if the 
figure may be trusted; but the spines of the carapace are 
differently arranged. Prof. 8. I. Smith (¢. c. p. 431), I may 
add, apparently regards this species as synonymous with his’ 
S. americanus, which has the median crest of the carapace 
“high, covered with low squamiform tubercles, tridentate, 
the anterior tooth small, and situated halfway between the 
front and second tooth,” &c. 
Crangon (Cheraphilus) cataphractus, Olivi. 
There is in the collection a single small specimen (a female 
with ova), length rather over 11 lines (24 millim.) , which I 
refer, with scarcely any doubt, to this species. The position 
of the spines of the carapace and the sculpture of the post- 
abdominal segments are similar to those obtaining in the Medi- 
terranean examples in the collection of the British Museum ; 
but the spines are much smaller. 
Alpheus paracrinitus, sp.n. (Pl. XVI. fig. 6.) 
Rostrum triangulate, acute, arising from the frontal margin 
* M. Brullé, in Webb and Berthelot’s ‘Tles Canaries,’ Crust. p. 18 
(1836-44), mentions the occurrence of S. arctus at the Canaries. 
+ Proc. Zool. Soc. 1881, p. 63. 
{ Proc. U.S. Nat. Museum, iti. p. 429 (1881). 
§ Arch. f. Naturg. p. 128, pl. v. fig. 13 (1872). 
