338 A. Alcock — Carcinological Fauna of India* [No. 3, 



The Pinnoteraa live as parasites or messmates, generally within the 

 mantles of Lamellibranch Mollusks. 



Key to the Indian species of Pinno teres. 



I. The dactylus of the external maxillipeds is articulated far 

 back on the inner or flexor edge of the propodite : the 

 eyes in the female are not entirely visible in an ordinary 

 dorsal view : — 



1. The dactyli of all the legs are about equal : — 



i. Carapace somewhat octagonal in outline, 

 with deepish tomentose pits separating the 

 branchial from the median regions : first 

 three pairs of legs nearly equal in length : 

 dactyli of all the legs of fair length P. Edivardsi. 



ii. Carapace circular, perfectly smooth : second 

 pair of legs decidedly the longest : dactyli of 

 all the legs very short P. mactricola. 



2. Dactylus of the 3rd pair of legs longer than any of 



the others P. purpureus. 



3. Dactylus of the 4th pair of legs longer than any of 



the others P. parvulus. 



II. The dactylus of the external maxillipeds is articulated to 

 the tip of the propodite : the eyes in the female are 

 entirely dorsal ... , P. alyssicola. 



37. Pinnoteres Edivardsi, de Man. 



Pinnotheres Ediuardsi, de Man, Journ. Linn. Soc, Zool., XXII. 1887-88, p. 103, 

 pi. vi. figs. 6-9 (1889). 



The description applies to the female. 



The length of the carapace is nearly equal to the greatest breadth. 

 Carapace octagonal in shnpe, with the angles rounded : its dorsal surface 

 little convex, with tomentose depressions of some size and depth 

 separating the median from the branchial regions. The deflexed part 

 of the front is very distinctly triangular. Eyes very small, but deeply 

 pigmented. 



Dactylus of external maxillipeds slender and inconspicuous ; placed 

 far back on the inner edge of the spathulate propodite. 



Chelipeds and legs more or less downy, especially on their under 

 surface. Chelipeds nearly as long as the carapace, a little longer and 

 much stouter than the legs, unarmed : dactylus as long as the upper 

 border of the palm. 



Legs rather coarse : the first 3 pairs are about equal in length, the 

 4th pair is a little shorter. 



Carapace 15 millim. long and J 6 millim. broad. 



From an Ostrsea from Mergui. 



