CALLIOPE PINGALLI. 
263 
A MPHIP OB A . CrA MM A RI DES. 
NAT ATOUI A. 
Specific* character. Like C. Ossiani, but baying the last segment of the 
pereion, and first three of the pleon, with the posterior dorsal margins pro- 
duced into an obtuse tooth, each increasing in size posteriorly. 
Length \ inch. 
This species may possibly be only an exaggerated 
variety of C. Ossiani. All the features peculiar to that 
species appear, however, in this, to be so much de- 
veloped (as noticed in our descriptions), that they alto- 
gether change the appearance of the animal. 
The cephalon is produced anteriorly into a short flat 
rostrum. The back of the animal is round from the first 
to the seventh segment of the body, which is produced 
posteriorly and slightly elevated into a tooth. This 
feature is repeated in the first three segments of the 
tail, increasing in dimensions posteriorly. The teeth are 
