1922. J S. Kemp : Notes on Crustacea Decapoda. 247 



antennal scale by the greater part of the chela. The merus is 

 rather less than 3 times as long as wide; it is conspicuously tuber- 

 culate along its lower border, but does not bear a distal tooth. 

 The carpus is a little longer than broad and is about half the length 

 of the merus. Its surface is somewhat uneven and it bears one 

 obscure tubercle on its upper surface and two beneath. There is 

 an excavation in the anterior margin on the inner side and the 

 border above this excavation is obscurely crenulate. The chela is 

 about 3 times as long as the merus and the fingers are a little less 

 than half the length of the palm. The palm is nearly 3 times as 

 long as wide and is rather closely covered with conspicuous tubercles 

 except on the middle of its inner face. The fixed finger is bent 

 at an obtuse angle to the palm There is a large triangular tooth 

 at the base of the dactylus which fits into a socket in the fixed 

 finger (text-fig. 80c). In the proximal third of the fixed finger there 

 are two teeth separated by a shallow excavation ; the anterior of 

 these is blunt and little developed, the posterior is broad and 

 crenulate on the summit. The tips of the fingers are inturned and 

 cross one another when the claw is closed. 



The last three peraeopods are stout ; the third (text-fig. 8od) 

 reach a little beyond the antennal scale, the fifth to the end of 

 the basal antennular segment. In the third pair the merus is 5*5 

 times as long as wide and the propodus is 5-5 times as long as the 

 dactylus. In the third and fourth pairs the posterior margin of 

 the propodus is thickly furnished with spinules along its entire 

 length ; in the fifth pair the spinules are restricted to the distal 

 end. The dactylus (text-fig. 8oe) is broad and biunguiculate, with 

 the accessory claw large. 



The pleurobranchs as in other Pontoniinae are ave in number, 

 one being situated above the base of each peraeopod. 



The sixth abdominal somite is short ; it bears a strong spine 

 on either side of the base of the telson and one at each postero- 

 lateral angle. The telson is flattened above, with two pairs of large 

 dorsal spines. The anterior pair is situated well in advance of the 

 middle, while the posterior pair is midway between the anterior 

 pair and the apex. At the tip of the telson there are as usual 6 

 spines, the intermediate pair the longest. The median pair is 

 unusually slender. 



The species is described from a single male about 24 mm. in 

 length. 



The specimen is the property of the Paris Museum. It was 

 obtained in August 1890 at Noumea in New Caledonia by Abbe 

 Cullieret. 



Genus Anchistus Borradaile. 



1898. Anchistus, Borradaile, Ann. Mag. Nat. Hist. (7) II, p. 387. 

 1917. Anchistus, Borradaile, Trans. Linn. Soc. (2) Zool. XVII, p. 387. 



The genera Anchistus and Pontonia comprise species which have 

 adopted a more secluded mode of life than any of those contained 

 in the preceding genera. The species of Anchistus live in the mantle - 



