256 



Records of the Indian Museum. [Vol,. XXIV, 



Text-fig. 85.— Anchistus miersi (de Man). 

 Dactylus of third peraeopod. 



are two rather small teeth on the proximal part of the inner mar- 

 gin of the dactylus ' and 8 or 9 small denticles on the proximal 



half of the fixed finger. In 

 a specimen from Pulo Con- 

 dore the carpus is as broad as 

 long and the palm is nearly 

 twice the length of the fin- 

 gers : there is only one large 

 tooth at the base of the dac- 

 tylus l and 5 denticles on the 

 fixed finger. The distal part 

 of the upper border of the 

 dactylus of the last three legs 

 is bent inwards the segment 

 thus forming a sort of scoop 

 (text-fig. 85). There is a 

 large tooth on the posterior 

 margin. On the reflected 

 part near the tip of the dactylus there are a number of extremely 

 minute spinules, only visible under a high power of the microscope. 

 The lateral margins of the telson are armed with two pairs of very 

 small spines arranged in the same way as in A . inermis. 



8238/6. Elphinstone I., Mergui J. Anderson, March, Two, Types. 



Archipelago. 1887. 



C 418/1. Port Blair, Andamans. S. Kemp, Feb., 1921. One, young. 



The specimen from Port Blair, which is only 11 mm. in length, 

 was found in a Tridacna on the shore at Aberdeen. It was almost 

 transparent when alive, with large sparsely distributed red chroma- 

 tophores. 



1 have also seen specimens belonging to the Paris Museum 

 from Batavia (Reynaud coll. ) and from Pulo Condore (Germain coll.) . 

 The specimen from the latter locality was found in Tridacna. 



A . miersi has been recorded from Mangareva in the Gambier 

 Is. in the pearl oyster (Nobili), from Funafuti in the Ellice Is. 

 (Whitelegge), from the D'Entrecasteaux Is., British New Guinea, 

 in Tridacna squamosa (Borradaile), from Elphinstone I. in the 

 Mergui Archipelago (de Man), the Maldives (Borradaile), the 

 Seychelles (Borradaile), from the vicinity of Arzanal. in the Persian 

 Gulf, in Spondylus (Nobili), from the Red Sea, in Pinna (Nobili) 

 and from Suakin Harbour, in Pinna (Tattersall). 4 The species has 

 thus been recorded from four different genera of lamellibranchs. 



Anchistus demani, sp. nov. 



This species is closely related to A. miersi, but is distinguished 

 by the following characters : — 



I In addition to the rounded knob near the articulation. 



II Tattersall states that Henderson has recorded the species from the coasts 

 of India, but I have not been able to find the reference. 



