HETEROCARPUS HOSTILIS. 153 
108 mm.; length of antenna, 400 mm.; length of antennal scale, 27.5 mm. ; 
length of telson, 27 mm. 
Station 3353. 695 fathoms. 22 specimens (“1 doz. rejected”’). 
9 
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This species is nearly related to H. alphonsi Bate, from off the Philippine 
Islands and Japan, but may be easily distinguished from the latter species by 
the more upturned rostrum, by the presence of but one tooth in the median 
dorsal line of the carapace back of the base of the rostrum (in H. alphonsi 
there are two*), and by the éwo spines on the third abdominal segment. 
In one ovigerous female from Station 3353 the teeth on the upper side of 
the rostrum are reduced to four (there are seven below). This is probably 
an abnormal variety merely. This specimen was drawn in color from life by 
Mr. Westergren. The ground color is bright red, with large patches of 
green on the carapace and abdomen. The green areas in the sketch corre- 
spond in their position to patches of mud still adhering to the specimen 
in alcohol, so that I think the green color is attributable to the mud, 
not to color-markings in the shell of the prawn. The bottom on which the 
specimen lived was composed of green mud. 
In another specimen, also a female, from Station 5595, the rostrum is 
very different from the normal type, being shorter — equal in length to the 
rest of the carapace —and armed with a single tooth, near the base, above. 
The inferior rostral teeth are smaller, more closely set, and more numerous 
(eighteen) than in the normal form. The carapace of this specimen is rep- 
resented on Plate XLI. (Fig. 1”). As this unique specimen differs in no 
other respect from H. hostilis, and comes from the same locality, I am dis- 
posed to regard it also as a mere variety or “sport” of that species. 
From Station 3363 (978 fathoms), 3370 (134 fathoms), and 3406 (551 
fathoms) come seven small specimens, ranging from 48 to 81 mm. in length, 
that differ considerably from the adult specimens of 7. hostilis. The rostrum 
is more nearly horizontal, and has about twelve teeth above and fourteen 
* Among the large number of specimens of H/. hosfilis examined, I have found a very few (four) with two 
spines on the carapace back of the rostrum, as in 1. a/phons?. 
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