15 315 



Family Calappidæ. 



Subfamily Calappinæ. 

 Calappa lophos (Herbst). 



"i Calappa lophos Alcock, LXV, 144, 189G (not C. guerini Capello). 



20 miles south of Koh Samit, 20 fath., mud; I. 31; Ic?. 4 miles south of 

 Koh Sakait, 9 fath., shell bottom; II. 3; 1 ?. Koh Kam, 5 fath., gravel; II. 6; 1 c? 

 1 Ç 3 juv. Between Koh Mesan and Cap Liant, 5 — 8 fath., sand, stones; II. 7; 3 

 juv. Gulf of Rayong, 7 — 10 fath., sand, mud, shells; II. 8; 2 juv. Tung Kaben, 6 

 fath., sand, mud, phanerogams; II. 22; 1 juv. Koh Chuen, 30 fath., shell bottom; 

 II; 1 juv. 



The specimens are all small, the largest being 485 mm. wide. I have for 

 comparison an adult Ç 76 mm. wide from Japan, which has the characteristics of 

 DE Haan's fig. 1, pi. XX (Fauna Japonica, Crustacea), and differs from Alcock's 

 description (loc. cit.) in having its extreme length (547 mm.) more than -/a of its 

 extreme breadth; in the front projecting forward beyond the level of the orbits; in 

 having the anterior border of the endostomial septum convex and not incised. In 

 the series of 14 Siamese specimens the width increases with age; a specimen 6 mm. 

 long is only 65 wide, while one 25 mm. long is a little longer than wide. 



Perhaps Alcock had a species other than C. lophos and conspecific with C. 

 guerini Capello. 



Subfamily Matutinse. 

 Matuta banksii Leach. 



Matuta banksii Alcock, LXV, 158, 1896. 



Between Koh Mesan and Cap Liant, 9 fath.; II. 4; 2 juv. Between Koh Mesan 

 and Cap Liant, 5—8 fath., sand, stones; II. 7 ; 1 juv. Koh Kam, 5 fath., gravel; II. 

 6; 2 juv. Between Koh Riat and Koh Mesan, 3—5 fath., sand, algæ; II. 7; le? 1 ? 

 4 juv. Koh Kahdat, 4—5 fath., sand, stones; II. 15—18; 1 c? 1 ? 2 juv. 



Matuta lunaris (Forskål). 



Maluta viclor Alcock, LXV, 160, 1896. 



Southwest coast of Koh Chang, sand, in shrimp net; I. 18; 2 juv. Coast of 

 Koh Kong; I. 23; 13c? 7 ?• Koh Chik; II. 2: le?. Shore outside the mangrove at 

 the Station on Koh Chang; III. 11; 1 Ç. 



