258 



the abdomen oC the cf is different, but, as the author remarks, this abdomen was rumpled in 

 the specimen figured. 



Accordino- to Dana the O of the species differs bj' the carapace being a good deal 

 broader than long; in the cT length and breadth are nearly equal. 



P. odcsHS came from the Fiji Islands and Borneo; P. siamcnsis originates from the 

 Gulf of Siam. 



Dimensions in mm. : 



P'ronto-orbital distance 1.48 



Length of carapace 3. — 



Breadth of carapace 3.08 



Length ) . J-. f , ■ r n • 1 * '■°3 



I of meropodite of 5^ pair of walking les^s -, 

 Breadth! ^ ^ ^ s ^ y ^^^ 



" , I of meropodite of Atli pair of walking les;s ( 

 Breadth I ^ ^ ' ^ ^ | q,^ 



4. Pinnotheres edwardsi de Man. 



Stat. 258. Tual, Kei Islands. Depth 22 m. 3 9- 



Three large individuals, without eggs, and the host of which is unknown, were taken. 

 They so closely resemble the figure of de Man that I cannot doubt their identity with P. edwardsi. 



The carapace is subcircular, hard, little flexible, with the middle parts somewhat elevated 

 and free from hairs ; towards the margins the surface is concealed by a dense down of soft 

 and thick hairs. After removal of these hairs several larger and smaller depressions, regularly 

 arranged, are disclosed; it is in these depressions that a particular kind of very short and 

 fine hairs, differing from the ordinary downy hairs, is retained. The carapace is moderately 

 vaulted, most so in the anterior part, where it passes gradually into the deflexed front, the 

 triangular middle portion of which is even curved backward ; the surface of the front is divided 

 by a faint median sulcus. The eyes are small, but quite distinct. 



The e.Kternal maxillipeds agree Avith de Man's description and figure, but the latter 

 seems to have been taken from the object when in place: in situ the dactylus presents itself 

 as a very narrow and slender rod, reaching exactly to the level of the obliquely-truncate distal 

 margin of the propodus, but when the external maxilliped is severed from the body and examined 

 separately the dactylus turns out to be flattened and somewhat curved towards the propodus. 



Chelipeds ^) and walking legs are short and covered with the two kinds of hairs observed 

 on the cephalothorax: thick, dense, soft hairs, which are easily detached and, beneath these, 

 very short, slender hairs, much more firmly implanted. Walking legs short, dactyli subequal, 

 all terminating into a fine, curved point. 



The only specimen hitherto known was taken from an Ostrea in the Mergui Archipelago. 



Dimensions in mm. ; 



Length of carapace. . . 18.5 

 Breadth of carapace . . 18.5 



l) Ai.coCK says that the fingers of the chela are unarmed, but in my specimens the usual, though low, tooth near the base of 

 the dactylus is distinctly seen. 



