152 THE VOYAGE OF H.M.S. CHALLENGER. 



and excavated inferiorly. The ambulatory limbs are granular, and the anterior margin of 

 the meri is spiny ; the dactyli are narrow, slightly tortuous, and almost smooth. The 

 abdominal segments are transversely carinated, and granulated towards the lateral margins; 

 the posterior margin of the sixth segment gives rise to two prominent rounded lobes. 



This species was taken by the " Talisman " in the Atlantic, off the north-west coast 

 of Africa, at a depth of 4000 metres (2187 fathoms). 



Munidopsis suhsquamosa, Henderson (PI. XVII. fig. 4). 



Munidopsis suhsquamosa, Henderson, Ann. and Mag. Nat. Hist., ser. 5, vol. xvi. p. 414, 1885. 



Characters. — The carapace is slightly pubescent, and covered with flattened scale-like 

 tubercles, which on the posterior half are elongated to form short transverse ridges. The 

 gastric area is convex and distinctly circumscribed, with its rounded lateral margins 

 formed by the cervical grooves, which pass unusually far forwards ; the scale-like tubercles 

 are well marked, and a few of those near the base of the rostrum terminate in short stout 

 spines ; the hepatic areas are flattened and depressed ; the cardiac area is indistinctly 

 mapped out, and a somewhat deep groove crosses it transversely near its middle, the 

 short ridge-like elevations are well seen on the posterior part of this area as well as on 

 the branchial regions. The rostrum is almost horizontal, and a little more than one-thii'd 

 the length of the carapace, with the upper surface granular and carinated, and the lower 

 surface smooth ; the apex is narrow and acute, but a considerable widening out takes 

 place near the base. The lateral margin of the carapace is armed with two broadly 

 conical yet acute spines, the second of which is almost horizontal in direction, and 

 separated from the first (placed at the antero-lateral angle) by the cervical groove ; a few 

 spinules are situated further back on the border, and a short spine occurs on the antero- 

 lateral margin immediately behind the antennal peduncle ; the posterior margin is broad 

 and transversely grooved, with a narrow and smooth strip of carapace in front. 



The chelipedes are comparatively short, and the joints are covered with small 

 rounded tubercles, many of which are pubescent ; a few short spines also occur on the upper 

 surface of the merus and carpus. The propodus is slightly dilated, while the fingers exceed 

 the palm in length, and their inner surfaces are deeply excavated towards the apices. 

 The ambulatory limbs are moderately long, the meral, carpal, and propodal joints are 

 tuberculate, and a series of short spines occurs on their front margin ; the dactyli are 

 smooth and fairly well curved, with the lower margin denticulate, the denticulations 

 increasing in size towards the apex. 



The eyes are of moderate size and possess but slight mobility, a small free rectangular 

 plate occurs on the ventral surface between the two ; each peduncle beyond the inner 

 margin of the cornea has a narrow acute spine. The antennal flagellum is apparently of 

 great length though deficient in the single specimen. The merus of the external maxilli- 



