FAUNA OF THE INLAND SEA OF SINGGORA. 99 



swimming-craba (Portunidae) Hie Indian Edible Crab (Scylla serrata), 

 which is also the common edible crab of the Malay Peninsula, and the 

 Blue Swimming Crab (Nej-)tanus pelagicus) are common. No ]'otamonid 

 apparently enters this part of the lake, though P. (jermaini occurs in 

 ditches and ponds at Singgora. 



Hermit-crabs (Paguridea) are prevented from making their way 

 fur any distance into the lake by the absence of large Gastropod shells 

 in which they might protect their soft bodies. At the mouth, the 

 common Indo-Pacific estuariiie form Clihanarius padavensis is very 

 abundant, living when adult in marine shells such as those of Purpura 

 and Murex which it brings in from the sea. 



The principal edible prawns at Singgora belong partly to the 

 marine and estuarine family Penaeidae and partly to the freshwater 

 genus Palaemon. Palaemoa carciaus, which has already been noticed 

 as occurring in the Patalung River, commonly enters brackish water in 

 this region to breed, while other members of the genus live in it 

 habitually. The small Atyid shrimps that live among weeds in the 

 inner lake appear near the edge of the outer lake at places where 

 the surface-drainage is sufficient to lessen the salinity of the water. 

 Some interesting burrowing forms occur in the mud of the connect- 

 ing channel, in particular Vpofjehia heterocheir Kemp, l which was 

 only known hitherto from backwaters and marine lakes on the coasts 

 of India. 



Several species of Mantis Shrimp ( Stomatopoda ) occur in the 

 outer channel near Singgora. The}- all belong to widely distributed 

 types. 



A considerable number of Ampliipods and Isopods were collected. 

 The former include the four-eyed Quadrivisio, the latter are remarkable 

 for the abundance of certain species parasitic, or quasi-parasitic, on fishes. 

 Two of these have been described from the Tal6 Sap by Lanchester, - 

 who has also described a peculiar little barnacle {Phdi/lepas Oj'JdopIdlus) 



1. Kemp, Mem. Jiul. .!/«.«., vul V, j). 257, pi. xiii, figs. (3, 7(1915). 

 Strictly speaking this species, which belongs to the group ThalassiiiiJe.a, is not 

 a prawn or !>iiriiup as it belongs to the Reptantia and not to the Caridea, but it 

 has a prawn-like appearance. 



2. Lanciicster, I'loc. Zool. Soc. Loiidun. 1902, pp. 377, 378, pi. xxxv. 

 figs. 5, 8, 0. 



VOL. II, DEC. I'JIO. 



