REPORT ON THE PYCNOGONIDA. 



53 



The only specimen of this species collected l)y the Challenger is a male fm-nished with 

 genital jiores on the second joint of the two last legs. 



Habitat. — This small species w^as dredged during the Challenger Expedition between 

 Celebes and Halmahera. 



Station 196. October 13, 1874. Lat. 0' 48' S., long. 126° 58' E. Depth, 825 

 fathoms. Bottom temperatm^e, 2 '4° C. Sea l)ottom, rock. 



Observations. — This fine species is highly interesting, Ijeing among the slender 

 species of Nymplion, the only one in which the form of the two last joints of the leg 

 shows a remarkable likeness to that of the same joints of most other genera of Pycno- 

 gonida. This, however, is not the only characteristic point ; a second is that the claws 

 of the mandibles are not armed wdth a row of very numerous spines as in the other 

 species of Nymplion, but only with three, four, or five spines. The species is blind, yet 

 the depth from which it was In-ought up was only 825 fathoms, whereas Nymphon 

 meridionale, Hoek, e.g., lives at a depth of 1674 fothoms and has four distinct eyes. 



Ascorhynchus, G. 0. Sars. 



Ascorhynchus glaber, n. sp. (PL VI. figs. 5-9 ; PI. XV. fig. 16). 



Diagnosis. — Proboscis one-tlm-d of the total length of the Ijody. Aljdomen half as 

 long as the proljoscis. Body and legs almost entirely smooth, with the exception of three 

 strong spines placed dorsally on the hinder margin of the first three thoracic segments. 



Description. — 



intervals between the lateral processes. The proboscis is very stout, pyriform, distinctly 

 triangular in transverse section ; each of the three sides of the proboscis is longitudinally 

 furrowed in the middle ; at its extremity the proboscis is sharply pointed, the mouth is 

 small and triangular. The proboscis is distinctly divided into a fore, middle, and hinder 

 part, the latter tapering towards the extremity, where it articulates with the cephalo- 

 thorax (PI. XV. fig. 16). The length of the cephalothoracic segment is very con- 

 siderable, being aljout half that of the trunk. Anterior to the insertion of the palpi it is a 

 little narrower, and at the front part it l)ears the mandil^les, between which it shows 

 a small azygous knob. On the dorsal surface a slight elevation is ol)served between the 

 two palpi, whereas behind the middle, almost exactly l^etween the two ovigerous legs, the 



