ig22.] S.Kemp: Notes on Crustacea Decapoda. 281 



(iii) The antepenultimate segment of the third maxilliped 

 (text-fig. 103a) is broad ; its greatest breadth is more than half its 

 length and at the distal end it is conspicuously wider than the 

 penultimate segment. The latter is rather less than twice as long 

 as wide and is a little longer than the ultimate segment. 



(iv) The carpus of the first peraeopods is about equal in 

 length with the merus. 



(v) There is one tooth on the dactylus of the second peraeo- 

 pod (text-fig. 103&) and two on the fixed finger, all of which are 

 rounded and, as a rule, finely serrate. The anterior tooth of the 

 fixed finger has the form of a very broad and gently convex 

 lobe. 



(vi) The last three peraeopods are comparatively slender. In 

 the third pair the merus is from 3*5 to 4 times and the propodus 

 from 45 to 5 limes as long as broad. The terminal claw of the 

 dactylus (text fig. 103c) is bent at an angle of about 45 to the 

 main axis of the segment and the basal protuberance bears a short 

 tooth on its proximal side. 



(vii) The dorsal spines of the telson (text-fig. 103d) are very 

 large, fully one-sixth of the total length (terminal spines excluded). 

 The distance between the posterior pair and the apex is equal, or 

 almost equal, to the distance between the two pairs. The lateral 

 apical teeth are compa r atively large and are situated at or very 

 near the distal end ' ; the mtermediate pair is conspicuously stouter 

 than the median. 



Large females sometimes reach a length of 35 mm. ; males do 

 not exceed 25 mm. 



Living specimens are semitransparent and colourless or pale 

 yellowish when alive. Females are closely sprinkled with minute 

 white dots, with the eggs and ovary very dark brown. 



4910/10. Andamans. A. R. S. Anderson. Thirty-five. 



C 43-I/1. Port Blair, Andamans. S. Kemp, Feb., Twenty-five. 



March, 1921. 



The specimens I have myself found were all obtained in Pinna 

 bicolor, Gmelin, 2 a mollusc which is common at low water in Bri- 

 gade Creek and on the shore south of Viper I. The same lamelli- 

 branch also harbours Anchistus inermis, a prawn which is almost 

 identical with Conchodytes biunguiculatus in colouration. Practically 

 every large Pinna which was opened contained a pair of either the 

 Conchodytes or the Anchistus, but the two species were never dis- 

 covered in the same mollusc. 



The species was described by Paulson from the Red Sea. I 

 think it probable that the specimens from Pinna recorded by Nobili 

 and Pearson from the Red Sea and from Cheval Paar in the G. of 

 Manaar, under the name C. meleagrinae , belong to this species. 

 The only other record of a Conchodytes from Pinna is that of 



' They are placed further forwards in Paulson's figure than in any specimen 

 I have seen. 



1 I am indebted to Dr. Baini Prashad for the identification of this species. 



