EEPOET OX THE PYCNOGONIDA. 55 



Habitat. — This iuteresting species was dredged during the Challenger Expedition at 

 Station 146. December 29, 1873. Lat. 46° 46' S., long. 45° 31' E. Depth of the sea, 

 1375 fathoms. Bottom temperature, 1"5° C. Sea bottom, globigerina ooze. 



Observations. — This species is, I beheve, closely allied to Ascorhynchus abyssi, 

 G. 0. Sars. It can, however, easily be distinguished from that species. 



1 . By the proboscis, which is as long as the trunk in Ascorhynchus abyssi, and only 

 two-thirds the length of the trunk in Ascorhynchus glaber. 



2. By the lateral processes of the Ijody, which in Ascorhynchus abyssi, " vix," iu 

 Ascorhynchus glaber are visibly longer than the l^readth of the body. 



3. By the oculiferous tubercle, which in Ascorhynchus abyssi is denticulate and 

 placed on the fore part of the first segment, while in Ascorhynchus glaber it is behind the 

 middle of the cephalothorax and quite smooth. 



4. By its three-jointed mandibles. 



5. By the legs, which are covered with short hairs and are twice as long as the body 

 in Ascorhynchus abyssi; in Ascorhynchus glaher, on the contrary, they are almost smooth, 

 and are only once and a half as long as the body. 



6. By the length of the body, 10 mm. in the Ascorhynchus abyssi, and 26 mm. iu 

 Ascorhynchus glaber. 



Ascorhynchus minutus, n. sp. (PI. VI. figs. 10-16). 



Diagnosis. — Proboscis not c[uite one-third of the total length of the body. Abdomen 

 one-thnd the length of the proboscis. Body and first joints of the legs furnished dorsally 

 with numerous strong spines. 



Description. — 



Length of tlie proboscis, ....... 2 mm. 



Length of the trunk, 



Length of the abdomen. 



Total length of the body, . 



Length of the cephalothoracic segment, 



Length of the thu'd leg, 



3-75 

 0-6.5 

 6-4 

 2-3 

 9 



The hodj of this nice little species is slender, and the intervals between the lateral 

 processes are great (PI. VI. fig. 10). The body and legs are almost eutkely smooth, single 

 hairs being found only at the distal extremities of the joints of the legs. The proboscis 

 is triangular, almost of the same form as that of Ascorhynchus glaber; it is distinctly divided 

 into three parts, the middle part l:)eing considerably swollen. The cephalothoracic seg- 

 ment is comparatively long, l^eiug as long as the remaining part of the Ixxly including 

 the abdomen. The oculiferous tubercle is situated in front of the middle of the cephalo- 

 thoracic segment and is much elevated ; the eyes are rudimentary. A distinct knob is 



