420 071 the Galatlieidea of the ^Challenger'' Expedition. 



Diptychus parvuluSj n. sp. 



Eostrum about three times tlie length of the ocular peduncles, 

 entire, the upper surface slightly hollowed out. Carapace 

 smooth and glabrous^ the lateral borders minutely dentate.. 

 Chelipedes with the meral and carpal joints short and armed 

 with small teeth, the hand longer and more dilated than either 

 of the former joints. Ambulatory limbs with the meral joints 

 slightly dentate, the propodi furnished distally with a series 

 of spines on the lower border. 



Length of body (of a c?) 12 millim. ; length of chelipedes 

 17 millim. 



Loc. Station 310 [Straits of Magellan], 400 fathoms. 



Di'ptychus poUtus, n. sp. 



E-ostrum narrow, only slightly exceeding the ocular pedun- 

 cles ; apex subobtuse. Carapace narrow and glabrous, without 

 spines or hairs. Chelipedes smooth, the propodal joint 

 slightly broader and longer than the carpal, tlie digits with 

 two rounded tubercles on the inner border, both fingers clothed 

 at their extremities with delicate hairs. Ambulatory limbs 

 slender, the tarsal and propodiil joints with a few spines, 

 otherwise smooth. 



Length of body (of a cJ ) 15 millim. ; length of chelipedes 

 24 millim. 



Loc. Station 171 [north of the Kermadec Islands], 600 

 fathoms. 



Diptychus australisj n. sp. 



Allied to the last, but differs in the following respects : — 

 The gastric region of the carapace is swollen and bears two 

 very minute denticles. The chelipedes are proportionately 

 longer and more slender, especially the carpal joints ; the inner 

 surface of the meral and ischial joints with several rows of 

 very minute tubercles. The propodi of the ambulatory limbs 

 long. The squama of the external antennas equals the ped- 

 uncle in length, whereas in D. politus it is very small. 



Length of body (of an adult ?) 21 millim.; length of 

 chelipedes 39 millim. 



Loc. Station 164 [off Port Jackson], 410 fathoms; station 



170 [north of the Kermadec Islands], 520 fathoms; station 



171 [north of the Kermadec Islands], 600 fathoms ; station 

 194 [off Banda Island], 360 fathoms. 



Diptychus gracilimanus^ n. sp. 

 Allied to D. politus and D. australis, but differs from both 



