CCXXXVl 
APPENDIX. 
size ; each segment of the body is also armed beneath with a spine of less 
strength than those which have been just described ; the rostrum has a strong 
tooth beneath, which does not appear in the figure in Phipps’s voyage. 
Crangon Septemcarinatus. 
C. thorace septem-carinato ; cariiiis serratis ; pedibus secundi paris brevissimis inunguiculatis. 
Plate II, fig. 11 — 13. 
Several specimens of this undescribed species were taken in the trawl on 
the west coast of Davis’ Strait. Length four inches ; colour varied red and 
white above, white beneath. Thorax seven-carinate, the three lateral carinae 
on each side serrate, the middle one with strong spines ; rostrum short, 
curving down between the eyes, grooved in the centre ; the five upper 
carinae carried on in very faint rudiments along the back ; the terminal setae 
of the superior antennae inserted nearly in the same horizontal line ; the 
interior one being the longest ; the first joint of the inferior antennae scarcely 
produced beyond the middle of the squama ; a strong spine on the abdomen 
directed forward between the chelate legs; the last joint of the pediform 
palpi sub-acuminate, rather longer than the preceding ; second pair of legs 
slender, very short, bristled and unarmed, (mag?iijied in Jig. 13,) in which 
last essential point it differs from the Pontophilus Spinosus of Dr. Leach, 
Mai. Pod. Brit., t. 37, to which in other respects this species bears a near 
resemblance. 
It is proper to notice, that a rigid application of every part of the character 
of the genus Crangon of Lamarck would exclude the Septemcarinatus, by 
reason of the second pair of legs being unarmed, and would render necessary 
the establishment of a new genus, of which it would be the only known species, 
and might possibly be the only existing one ; it may, however, be questioned 
whether the pursuit of natural history be either forwarded, or rendered more 
attractive by the multiplication of genera, which is a consequence of the 
extent and precision which have been introduced into the characters of some 
