REPORT ON THE ANOMURA. 109 



Antennal peduncle nfirrow and elongated, placed under the eye-stalk, and composed of 

 five joints, the second of which is provided with a slender movable acicle. Second 

 abdominal segment with its lateral margin prolonged into anteriorly directed spines ; all 

 the appendages except the penultimate pair absent in the male. Telson comparatively 

 small in size, transversely segmented, and folded under the preceding abdominal segments. 

 Branchiae absent from the bases of the external maxillipedes. 



This remarkable genus apparently forms a connecting link between Munida and the 

 genera Ptychogaster and Urojiijtchus ; it agrees closely with the first of these in the 

 arrangement of the frontal spines (with the exception that there is an additional pair of 

 supraorbitals), the presence of pubescent strise on the carapace, and the shape of the 

 chelipedes and ambulatory limbs, while it resembles the two last in having the swimming 

 fan somewhat rudimentary and folded under the remainder of the abdomen. In some 

 respects it occupies a unique position among Galathodea, for, as has been pointed out by 

 Professor Smith, the pair of rudimentary arthrobrauchiae usually present on the eighth 

 body segment are absent, and the first five abdominal segments are without appendages 

 in the male, while an examination of the Challenger species shows some peculiarities in the 

 arrangement of the antennal peduncle, which I take to be of generic value. ^ The only 

 previously described species, Eummiida picta, S. I. Smith, was taken by the United 

 States Fish Commission ofi' the south coast of New England, at a depth of from 115 to 

 158 fathoms. 



Eumunida smithii, Henderson (PI. XV. fig. 5). 



Eumunida Smithii, Henderson, Ann. and Mag. Nat. Hist., ser. 5, vol. xvi. p. 413, 1885. 



Characters.—l!\i& carapace is very slightly arched from side to side, with its surface 

 glabrous, and crossed by about a dozen sparingly ciliated transverse strise. The frontal 

 spines are all slender and deflexed, but especially the rostrum, which is about one-third 

 longer than the first supraorbital, and nearly twice the length of the second. The gastric 

 area is flattened and circumscribed, with a slight hollowing out towards the base of the 

 rostrum, and the transverse striae have a tendency to become squamose, more par- 

 ticularly in front ; the hepatic area is deeply concave, and on its upper boundary three 

 small spinules pass in an oblique line from the base of the second supraorbital spine, the 

 first being very minute, and the third or most posterior being slightly larger than the 

 second ; the cardiac area is circumscribed anteriorly, but like the remainder of the carapace 

 is unarmed. The lateral margin of the carapace is armed with six curved spinules, 

 gradually decreasing in size from before backwards, of which one is placed in front of the 



1 The presence of an additional segment may possibly be a specific and not a generic character, for I have already 

 noticed the occurrence of a similar number in a species of Porcellana {Porcellana, serratifwns, Stimpson), in which 

 genus the normal number is four. 



(ZOOL. CHALL. EXP. — PART LXIX. — 1888.) ZzZ 22 



