ig22.j S. Kemp : Notes on Crustacea Decapoda. 283 



ohe at the base which is small, rounded and serrate and another 

 situated in the middle of the finger which is triangular and fits 

 between the two dactylar teeth. The latter is not serrate and is very 

 different from the low broad-based lobe found in C. biun°uiculatus. 



(vi) The last three peraeopods are slightly stouter than in the 

 preceding species. In the specimen examined the merus of the 

 third pair is 31 times and the propodus about 4 times as long as 

 wide. The dactylus (text-fig. 104c) is similar to that of the pre- 

 ceding species and bears a short tooth at the proximal end of the 

 basal protuberance. 



(vii) The dorsal spines of the telson (text-fig. 104 d) are very 

 large, rather more than one-sixth of the total length (terminal 

 spines excluded). The outermost pair of distal spines is shifted 

 forwards on to the dorsal surface of the telson and, though they 

 are very large, their tips do not reach the apex. There are thus in 

 this species three pairs of dorsal spines and two at the tip. The 

 intermediate pair of dorsal spines is situated just behind the middle 

 of the telson and the distance between them and the apex is greater 

 than that which separates them from the anterior pair. Of the 

 two pairs of spines at the apex the outer are slightly stouter than 

 the inner. 



The single specimen examined is a male 16 mm. in length. 

 Parisi notes that one of his examples was 23 mm. in length. 



C. nipponensis is easily distinguished by the unusual position 

 of the outermost terminal spines of the telson. The character is 

 evidently not an individual abnormality as it is shown in Parisi's 

 figure and referred to in his description. Except for the somewhat 

 shorter rostrum the anterior parts of my specimen agree precise^ 

 with Balss' figure. 



C 435/1. Misaki, Japan. N. Annandale, 1915 One. 



(Misaki Lab.). 



Although this species is here recorded for the fourth time, we 

 are still without information as to the mollusc in which it lives. 



The species is known only from Japan. De Haan gives no 

 definite locality for his specimens : those recorded by Balss and 

 Parisi were from Saga mi Bay. 



Conchodytes tridacnae Peters. 



1917. Conchodytes tridacnae, Borradaile, Trans- Linn. Soc. (2) Zoo/. 

 XVII, p. 393. 



The specimens that I refer to this species agree in the following 

 points : — 



(i) The rostrum in dorsal view is rather bluntly pointed and 

 reaches to or a little beyond the end of the antennal scale. 



(ii) The outer margin of the basal segment of the antennular 

 peduncle (text-fig. 105a) is distally rounded and not acutely pro- 

 duced as in the other Indo-Pacific species of the genus. 



(iii) The antepenultimate segment of the third maxilliped is 

 about 2*5 times as long as wide and at the distal end is not much 



