204 BULLETIN OF THE 
Heterocarpus hostilis, sp. nov. 
Similar to H. alphonsi Bate, from off the Philippine Islands and J apan, but 
readily distinguished from that species by the stronger upward curve of the 
rostrum, by the presence of but one tooth in the median dorsal line of the 
carapace back of the base of the rostrum, and by the two spines on the third 
abdominal segment. 
Length, 197 mm.; rostrum, 70 mm. ; carapace, including rostrum, 108 mm. 
Station 3353. 695 fathoms. 22 specimens. 
mi, 20008 IA 24 m 
9 InODOd gue. 6 3 Hs 
E BUB SAOR Y 20- “ 
Ar 09801 ag ene 6 e 
P OBB. LUQUE TY 8 “ 
OOO Bl 2 A 
Heterocarpus affinis, sp. nov. 
Very similar to H. hostilis, from which it differs in the following particulars. 
The rostrum is much shorter; measured from the tip to the posterior limit 
of the orbit, it about equals the rest of the carapace in length. There are 
fewer teeth on its dorsal margin (five or six) ; the number of teeth on its lower 
margin varies from six to ten. The median dorsal line of the carapace is more 
convex, and it is armed, back of the base of the rostrum, with two acute teeth, 
where there is but one tooth in M. hostilis. 
It bears a resemblance, further, to M. dorsalis Bate, collected by the “ Chal- 
lenger” in the Banda Sea, but it may be at once distinguished from the 
Oriental species by its shorter rostrum and the presence of two median teeth 
on the third abdominal segment. 
H. affinis and H. hostilis belong to different geographical areas. HH. affinis 
is the more northern form, found off Acapulco and Cape Corrientes, while 
H. hostilis was obtained in the Gulf of Panama. 
Station 3418, 660 fathoms. 13 specimens. 
" — 8494. 676 " 5 E 
E 3425. 680 i 9 d 
Famil NEMATOCARCINIDZE. 
Nematocarcinus agassizii, sp. nov. 
The rostrum is one fifth longer than the rest of the carapace (in some small 
specimens only equal to the rest of the carapace), slender, nearly horizontal 
for the basal two fifths of its length, the remaining portion gently upturned and 
ending in a very acute point; its upper margin is continued backward in the 
