EEPORT ON THE PYCNOGONIDA. 



57 



3 mm., whereas the length of the body of Ascorhynchus minutus is only 6'4 mm., and 

 that of the proboscis 2 mm. 



2. The abdomen of Ascorhynchus ramipes is about as long as the proboscis, while 

 that of Ascorhynchus minutus is nearly one-third the length of the proboscis. 



3. On the dorsal surface the thoracic segments and the lateral processes in Asco- 

 rhynchus ramiiJes show round knobs, in Ascorhynchus minutus distinct prickles. 



4. The four last joints of the ovigerous legs of Ascorhynchus ramipes are furnished 

 with a single row of denticulated spines; those oi Ascorhynchus minutus with three distinct 

 rows. (I think this difference is not a real one : Bohm's observation and description will, 

 no doubt, in this respect, be found deficient.) 



5. The first true leg of AscorhyncMis ramipes is not furnished with a claw, that 

 of Ascorhynchus minutus has a small, but distinct claw. 



Ascorhynchus oHhorhynchus, n. sp. (PI. V. figs. 11-13; PI. VI. figs. 1-4; PI. XV. 

 figs. 14, 15). 



Diagnosis. — Proboscis almost half the length of the body. Abdomen not quite one- 

 third the length of the proboscis. Dorsal surface with a row of prickles, also the lateral 

 processes. 



Descrip)tion. — 



The body of this species is very slender and almost smooth. The proboscis does 

 not incline to the ventral side, and is not so much swollen as in the other species of 

 Ascorhynchus, consequently the form is not pyriform, but rather club-shaped. The 

 proboscis shows longitudinal furrows ; the mouth is, as in the other species, triangular 

 and very small (PL XV. fig. 14). 



The cephalothoracic segment is comparatively short, being only half as long as the 

 proboscis ; the mandibles and the palpi are placed on distinct prominences. The 

 oculiferous tubercle is elevated and conical, and furnished with four distinct eyes ; the 

 lateral processes for the ovigerous legs are very small, those for the first pair of true legs as 

 weU as those for the following legs are of considerable size. The lateral processes of the true 

 legs are widely separated, thus contributing to the slender appearance of the whole body. 

 Posteriorly the cephalothoracic, as well as the two following segments, are consider- 

 ably elevated dorsally, while the anterior part of the following segment is much narrower, 



(ZOOL. CHALL. EXP. PART X. 1881.) K 8 



