356 CEYLON PEARL OYSTER REPORT. 



Description : r* '^' ^ n ^ ront * l atera l Lateral spine 1. (anterior 



spines) -f- C.I. border) 4- C.I. 



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



(b) Adult rf. . . . 17'25 1'22 0'22 



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



The hairs on outer parts of pterygostoraian 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-i-315). 



Cryptosoma granulosum (DE HAAN), 1835 A. 2, p. 152. 



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

 Description: (a) Adult male, C.I. = 19 '50 ; C.b. -e-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, FABR.). 



Locality : Galle, one specimen. 



Description: Young female, C.I. = 38 '50 ; C.b. (without spines) -=- C.I. = 1'05; 

 lat. spine 1. (ant. border)-;- C.I. = 0'28 ; frontal b. -=- orbital b. = 110. 



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, 6) ; pearl banks, 

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



Description : (a) Young ? . (6) ad. ? . (c) ad. <?. (d) ad. rf. () ad. rf. 



C.I 17'50 2075 2375 26'50 '27'50 



C.b. (without spines) -T- C.I. . 1'03 1'04 1'03 I'Ol 1'02 



Front. b.-r orbit, b. . . . 1-15 112 111 MO 110 



Lat. spinel. -T- C.I 017 014 Oil 017 012 



Cryptocnemus holdsworthi, MIERS (' Trans. Linn. Soc.,' 1877, p. 241). 



Locality : Gulf of Manaar, two specimens. 



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



C.I 7-25 7-25 



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



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



