CCSXXVl 
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 ; carinis serratis ; pedibus secundi paris brevissimis inunguiculatis. 
Plate II, fig. II— 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 carinss 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 antenna; 
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, (magiiified in fig. IS,) 
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 
