356 CEYLON PEAKL OYSTER REPORT. 



Description : n C.b. ( m front of lateral Lateral spine 1. (anterior 



spines) + C.l. border) -H C.l. 



(a) Ovigerous ? . . 17-00 1*21 0'22 



(6) Adult 6. ... 17-25 1-22 0*22 



The specimens are about one-third the size given by Alcock. 



The hairs on outer parts of pterygostomian and subhepatic regions are not long, nor 

 do they form a dense felt. 



Length -j- breadth of meropods of walking legs 1, 2 and 3 is only about 0'33 (e.g., 

 meropod W.L. 3 of (a) ovigerous female = 9"5-J-3'15). 



Cryptosoma granulosum (de Haan), 1835 A.2, p. 152. 



Locality : Aripu coral reefs, Gulf of Manaar, two specimens. 

 Description: (a) Adult male, C.l. = 19-50; C.b. -J-C.l. = 0'92. 

 The granular transverse ridge at distal end of arm bears 2 spines only. 

 Remarks; Genus is new to Ceylon fauna. 



Matuta lunaris (Forsk.), 1775 A.2, p. 160 (under M. victor, Fabk.). 



Locality : Galle, one specimen. 



Description: Young female, C.l. = 38 50 ; C.b. (without spines) -4- C.l. = 1 "05 ; 

 lat. spine 1. (ant. border) -=- C.l. = 0-28 ; frontal b.-i-orbital b. = 1-10. 



Remarks: The M. lunaris of Alcock (A.2, p. 161) = M. planipes, Fabr., 1798 

 (Stebbing, in 'Mar. Inv. S. Africa,' iv., 1905). 



Matuta miersi, Henderson, 1886-87 A.2, p. 163. 



Locality : Gulf of Manaar and Palk Straits, two specimens (a, b) ; pearl banks, 

 Gulf of Manaar, three specimens (e, d, e). 

 Description : (,) Young ? , 



C.l 17-50 



C.b. (without spines)-=- C.l. . T03 



Front. b.-=- orbit, b. . . . 1*15 



Lat. spine L-S-C.l 0'17 



Cryptocnemus holds worthi, Miers (' Trans. Linn. Soc.,' 1877, p. 241). 



Locality : Gulf of Manaar, two specimens. 



Description : ( a ) ovigerous female. (b) female. 



C.l 7-25 7-25 



C.b. + C.l 1-38 1-48 



The carapace outline of this species is subject to some variation. Miers' specimen 

 and the present ones are the only three recorded so far as I am aware. In treating 

 this genus as non-Indian, Alcock overlooks Miers' locality -Ceylon. 



