ig22.] 



S. Kemp: Notes on Crustacea Decapoda. 



183 



C 364-5/1. Kilalcarai, Gulf of Manaar. S. Kemp, Feb., Forty-four, includ- 



1913. ing Types. 



C 366/1. Port Blnir, Andamans. S. Kemp, March, About one hun- 



1915 ; March, dred. 



1021. 



In the Gulf of Manaar the species was caught at low water 

 by working a hand-net among corals belonging to the genus 

 Montipora. At Port Blair it was obtained by precisely similar 

 methods from a large Alcyonarian belonging to the family Alcyon- 

 idae. When the net was worked elsewhere no prawns were cap- 

 tured and this fact leads me to believe that there is a real asso- 

 ciation between the Carids and the Coelenterates on which they 

 were found. 



The diversity of form in the second peraeopods is a very 

 remarkable feature of this species. The largest specimens, as 

 noted above, are from the Gulf of Manaar and of these the great 

 majority are ovigerous females. The collection from this locality 

 has unfortunately suffered damage and only a comparatively 

 small number of individuals possess both the second peraeopods. 

 The collection from Port Blair contains very few ovigerous speci- 

 mens ; the majority are young and it is possible that the characters 

 of the second legs would undergo modification with further 

 growth. 



In specimens in which both the second legs are present the 

 combination of structural types which go to form a pair is as 

 follows : — 



Types of 



structure found 



in a pair.' 



Number of specimens. 



G. of Manaar. 



Andamans. 



<ul 

 bb 



be 

 bd 

 r.v. 

 i-d 

 dd 



3 



5 

 3 



4 

 - 2 



1 

 7. 

 3o 



60 



Legs of types b and c show a certain amount of variation 

 and it is sometimes a little difficult to distinguish between them. 

 Those of types a and d, on the other hand, appear to be very 

 constant ; they show little variation and can always be recognised 

 at a glance. 



Legs of type a are invariably issociated with those of type d 

 and the specimens which possess this combination are all ovigerous 



1 The letters in this column refer to the description on pp. 18 1, 182 and to the 

 figures in text-fig. 38. 



