4° 



shape of the terminal joint: the dactyH, that measure one-third of the propodi, show still the 

 same slender form as those of the 4'^ pair, so that these legs are not yet cheliform as 

 is the case in the adult female. 



The pleopods of the 2^'^ — 5''^ abdominal somites are already shaped as in the adult female; 

 they are biramous, the outer branch foliaceous, the inner slender, much shorter than the exopod 

 and supporting an Appendix interna, that is also slender and a little shorter than the endopod. 



Of this young female a detailed description was given, because it has nearly the same 

 size as the "Challenger" type. As regards the other older and partly adult specimens I can 

 therefore be shorter. 



In two males, 134 mm. and 107 mm. long, and in two females measuring 174 mm. and 

 164 mm., the latter of which is egg-bearing, all from Stat. 38, then furthermore in two males, long 

 134 mm. (PI. II, fig. 5) and i 19 mm., and in a female, long 122 mm., from Stat. 297, the frontal 

 margin bears in the middle the same small conical tooth, which has been described 

 in the young female and which, no doubt, represents the rostrum, that occurs in the genera 

 Palinnriis s.s., Palitiiistits A. M.-Edw. and Jastis Parker. In all the other specimens, however, 

 20 in number, this tooth is completely wanting, the frontal margin being quite entire, 

 as in the "Challenger" type. Like in the three cited genera, the large supra-orbital spines are 

 turned outward and flattened above at their base; at their inner side the frontal margin projects 

 more or less far forward and this prominence is usually cut into 2, 3 or 4 small, acute teeth, 

 rarely, like in the male, long 142 mm., from Stat. 297 this prominence is rounded, unarmed. 

 Behind the large supra-orbital spine there is another, which is much smaller, its posterior margin 

 being little more than half as long as that of the large (proportion 8 : 14); this second tooth 

 or spine is also directed outward and their tips are slightly farther distant from one another 

 than those of the supra-orbital spines. The 2"^^ spine is followed posteriorly by a third, which is 

 much smaller than the second, its posterior margin measuring only about Ys of that of the second; 

 these spines are slightly less distant from one another than those of the two anterior pairs. 

 Alcock's description (I.e. 1901, p. 185) is not clear, as regards these spines, for they are not 

 only regarded as defining the lateral margins of the carapace, but they are described as three large 

 teeth, which is apparently not the case, the third being very small. In the original description 

 of this species SrEXCE Bate speaks of 3 or 4 teeth, but four are figured on either side. The 

 large infra-orbital spine is little smaller than the supra-orbital one, but distinctly larger than 

 the spine behind it; its outer margin is curved and it is directed more or less outward. Alcock 

 says that there is a small spine below and anterior to it; in all the specimens, lying before 

 me, one observes here a prominence about half as long as the infra-orbital spine and cut into 

 2, 3 or 4 acute teeth. 



The spiniform teeth on the middle of carapace and abdomen, like also those on the 

 lateral, angular margins of the carapace, described as occurring in the young female, become 

 gradually lower and less prominent, the older the specimens are, so that those in 

 the middle line of the abdomen appear at last as narrow, elongate and low tubercles, that are 

 blunt and obtuse on the 2 or 3 anterior somites. The pleura of the 3"' — 6''' somites terminate, 

 even in the largest individuals, in a pair of spines, which are larger in the female than in 



