CRl'STACKA MAI.ACOSTRACA. HI 



From these enumerations it is seen that this species goes down to 1199 &" the warm 

 area, to 1333 lath, in the cold area, and that in high latitudes it has been taken in depths of 10 and 

 of about 35 fath. 



79. Uyarachna bicornis n. sp. 

 (PI. XI, figs.8a-8c). 



Female (without marsupium). Closely allied to /. hirticffa but distinguished by a few fea- 

 tures. The head, which is about as broad as first thoracic segment (fig. 8 a), has its upper surface 

 -mouth, excepting that it possesses a single pair of conspicuous, robust, somewhat conical, acute pro- 

 tuberances or teeth, placed at some distance from the hind margin and considerably apart from one another. 

 The basal joint of the antennulae (fig. 8 b) about as broad as the length of its inner margin, while 

 the distal part outside the articulation of next joint is produced into a good-sized triangle terminating 

 in a spine; the outer margin of the joint has no spines, but at most some short setae. The basal 

 joint of the antennae (fig. 8b) is broad, with the outer corner considerably produced and terminating 

 in a thick spine. 



Second thoracic segment broader than the head and considerably broader than fifth segment 

 (fig. 8 a). The four anterior segments with partly moderately small, partly very small spines along their 

 anterior margins, about ten spines on the second and only a few on fourth segment; the shape of the 

 sides of the four anterior segments and the epimera may be sufficiently seen on the figure. The 

 abdominal operculum has a high keel with many spines; the uropods without exopod. 



Length of the largest specimen 87 mm. 



Remarks. This species is certainly valid, not a variety of /. hirticeps; the curious armature 

 of the head and the absence of spines on the outer margin of the basal autennnlar joint must be 

 good characters. 



Occurrence. Gathered by the "IngolF at a very deep station in the warm area. 



Davis Strait: Stat 36: Lat. 6i5o' N., Long. 562i' W., 1435 fath., temp. 1-5; ^ spec. 



80. Uyarachna dubia n. sp. 

 (PI. XI, figs. 93-9 c). 



Female (without marsupium) and Male. Closely allied to I.hirttccps. Head distinctly nar- 

 rower than the first and somewhat narrower than second segment; its surface is completely smooth, 

 without any trace of spines. Basal joint of the antennulae (fig. gb) scarcely as broad as the length 

 of its inner margin, while the distal outer pan is produced into a considerable or even rather long 

 triangle terminating in a small spine and a feathered seta; the outer margin with at most a few thin, 

 nearly setiform spines; in the female (fig. gb) the flagellnm consists of five joints, the four distal very 

 slender and moderately long, while in the male the flagellum is considerably thicker and longer, with 

 about nineteen short joints. The anterior margin of the four anterior thoracic segments without 

 spines or distinct crenulation. The shape of the epimera may be seen on fig. 9 a. The female oper- 

 culum has a high keel with strong seta:; the uropods without cxopod. 



