S8 
CRUSTACEA. 
21. Crangon salebrosus. n.s. 
Crang. salebrosus, thorace septem-carinato, segmentis binis spinis utrinque terminatis. 
Long. corp. unc. 4. Color fuscus. 
Young and full-grown specimens of this species were taken along the shores of Kamtschatka. 
The general habit of the body is granulate and scabrous. The thorax is seven-carinate ; the lateral 
carince serrate, the inferior ones indicated by tubercles longitudinally disposed, the middle one with 
two or three serrate, but not very acute or produced spines ; a lateral carina is carried on by tubercles 
along the abdominal segments. It may be remarked, that these carina are neater and more distinct 
in the younger specimens, being confounded with neighbouring tubercles in the full-grown animat. 
The rostrum is short, depressed, grooved on each side. There is a short spine at the anterior margin 
of the thorax beneath the eye, and a large and considerably produced one at the inferior angle ; other 
spines exist at the commencement of the carina;: there are four spines beneath the thorax, as in Cran- 
gon Boreas. As in that species also, the antenna do not exceed the length of the thorax. The abdomi- 
nal segments terminate below in two spines, excepting the last, which has a single spine and a double 
carina along the dorsum. The ultimate joints of the fourth and fifth pairs of feet are slender, and 
curved, and terminate acutely. 
Plate XXVII. Fig. 1. Crangon salebrosus. 
22. Crangon lar. n. s. 
Crang. Icevis, rostro emarginato, oculorum pedunculis approximatis porrectis. 
Long. corp. unc. 3g. 
One large and some smaller specimens of this species were taken in the Arctic seas, but the pre- 
cise situation is not indicated. The length of the larger specimen is four inches. Its exterior is 
smooth and shining. The thorax has two spines behind the rostrum, one on each side at the anterior 
margin, and another some way behind these. The rostrum is elevated, but truncate at the apex, or 
emarginate; the eyes are situated immediately beneath it, their peduncles lying parallel with each 
other, and in the same line with the body. The second joint of the superior antenna is dilated and 
spiniform externally, the seta projects very little beyond the lamina of the inferior antenna ; these, as 
in the preceding species, not exceeding the length of the thorax. The ultimate joints of the fourth 
and fifth pairs of legs are compressed and lanceolate. The abdominal segments are simply ciliate 
inferiorly ; the first five are carinate above, the last has a double carina which is continued along the 
middle lamella of the tail, where towards the end they become indicated by lateral spines. 
Plate XXVIII. Fig. 1. Crangon lar. 
Genus HIPPOLITE, Leach, Malacostr. Pod. Brit. 
23. Hippolite aculeata. 
Alpheus aculeatus. Sabine, Suppl. to Parry's Voyage, p. 237. pi. 2. Jig. 9, 10. 
As it seems now agreed to restrict the genus Alpheus of Lamarck to those species whose second 
pair of claws are shorter than the first, I have referred this and the following species to the well-founded 
genus of Leach and Desmarest. 
The specimens are from the Arctic seas. 
24. Hippolite armata. n. s. 
Hip. thoracis carina quadri-dentata , margins antico trispinoso, segmentis spinis binis aut terms utrinque terminatis. 
Long. corp. unc. 3, lin. 3. 
In this species the thorax is granulate, with the inferior and posterior margin canaliculate ; along 
the middle line it bears four elevated spines; the anterior margin has three spines. The rostrum is 
