CARCINOLOGICAL STUDIES. 245 



The larger hand of the male is 20^/3 mm. long above, 

 but 22 mm. below, the chela of the female 15 mm. above. 

 Behind the third maxillipedes and close to them , the 

 sternum presents a transverse groove. 



Dr. Hilgendorf finally adds that in a younger male 

 specimen from Port Mackay, only 20mm. broad, the two 

 anterior legs are still nearly equal and that the trans- 

 verse groove on the sternum is still wanting. 



8. G eotelphusa loxophthalm a , n. sp. ') 



(Fig. 3). 



One single male specimen , collected by Schwaner at 

 the island of Borneo and presented to the Leyden Museum 

 in 1846. 



This interesting new species , which has no postfron- 

 tal ridge and which therefore ought to be referred to 

 the subgenus Geotelphusa , may at first sight be recog- 

 nized by the oblique direction of its small or- 

 bits, by the narrow front and by the enlarged carapace. 



The cephalothorax is much enlarged and exactly 

 once and a half as broad as long. It is somewhat 

 convex from behind forwards, especially anteriorly, whe- 

 reas it is more flattened posteriorly. As in Geot. picta , 

 the cervical suture is interrupted on each side of the pos- 

 terior part of the gastric region ; the median H-like im- 

 pression is rather shallow, but the oblique anterior fur- 

 rows, separating the gastric from the anterior branchial 

 regions, are deeper. A postfrontal crest may be consi- 

 dered to w a n t in this species , for it is only represented 

 by the two very low, somewhat erose elevations, which 

 are situated behind the front and separated, as usually, 

 from one another by the median frontal furrow. The 

 front is very narrow and the orbits are small, 

 so that the distance between the external orbital anj^les 



1) Ao|rf?, oblique. 



Notes from the Leyden ^lusevim , Vol. XIV. 



