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HETEROCARrUS IIOSTILIS. 



153 



108 mm.; length of antenna, 400 mm. j length of antennal scale, 27.5 mm, 



length of telson, 27 mm. 



Station 3353. 695 fathoms. 22 specimens (^^ doz. rejected"). 



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3363. 

 3364. 



3371. 



3380. 



3395. 



978 

 902 



770 



899 



1020 



730 



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This species is nearly related to 77. alphonsi Bate^ from off the Philippine 

 Islands and Japan, but may be easily distinguinhed 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 IL 

 there are two *), and by the kuo 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 3395, the rostrum is 

 very different from the nornuil 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 II, hostiUs, 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 IL hostiUs. The rostrum 

 is more nearly horizontal, and has about twelve teeth above and fourteen 



* Among the large number of specimens of IT. Imtilh cxamlucd, I have found a very few (four) with two 

 spiiiea on the carapace buck of the rostfuin, as in 77. alphonsi. 



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