MUSEUM OF COMPARATIVE ZOOLOGY. 201 



anastomose in such a way as to divide these regions into cells of different sizes ; 

 they are armed with three small spines, the anterior of which is the spina 

 hepatica. 



The thoracic sterna are armed with two median spines, one of which is situ- 

 ated on the somite which normally bears the second jiair of legs (absent in this 

 genus), the other on the somite behind this. Abdominal pleursE acute. 



Chelipeds of moderate length, with a spine on each side of the distal end of 

 the carpus, and another long and acute one at the antero-internal angle of the 

 propodus. 



Length, 85 mm. 



Station 3424. 676 fathoms. 2 males, 3 females (1 ovig.). 

 " 3425. 680 " 1 male. 



Family GLYPHOCRANGONID-S!. 



Glyphocrangon alata, sp. nov. 



Rostrum armed with a pair of lateral spines on a level with the anterior end 

 of the eye ; posterior to this pair of spines follows a variable number of smaller 

 marginal spines (three to five on each side). The anterior half of the rostrum 

 is unarmed, although ciliated on the margin. A light spinulose carina runs 

 along the median line of the rostrum from the base to the anterior third (in 

 some specimens this carina is obsolete). On each aide of the median line there 

 are, on the basal part of the rostrum, four or five small spinules. 



Carapace and abdomen thickly tuberculated. On the antero-lateral regions 

 of the carapace, and on the abdominal pleurae, the tubercles assume a spiny 

 character. For the rest, the tubercles are mostly compressed, their tops trun- 

 cate and more or less eroded. It is further to be noted that these tubercles are 

 arranged in longitudinal rows, and that six of these rows on each side of the 

 carapace form, by their prominence, imperfect carinse, corresponding in position 

 to those commonly found in species of this genus. Between the external or- 

 bital spine and the spine at the antero-lateral angle of the carapace lies a 

 strong spinous tooth, acute at the end and vertically compressed, its base 

 broadening out in such a fashion that the whole tooth forms an acute, wing- 

 like expansion. Tliis is, in fact, the greatly developed anterior part of the 

 fourth carina (counting from the median dorsal line). Behind it the carina 

 continues as a low toothed ridge. A median interrupted dorsal carina runs 

 along the abdomen, broken up into two teeth on the base of the telson. 



Length, 116 mm. 



Station 1 12-}- specimens. 



" 3395. 730 fathoms. 1 

 « 3418. 660 " 2 



