,is extremity ill a considerable distance from the edge. Also 

 le posterior part ot the duplicative is of considerable breadth 

 lough by far not so broad as the former. 



The olonr of the shell in a living state of the animal is 

 irk greenish, especially on t lie upper and hind pari, as also on 

 ic outer half of the anterior extremity exhibiting inside the shelf- 

 ke duplicative. Some areas of the shell arc, however, more 

 dlucid, allowing some of the inner parts to be faintly traced, 

 s in most other Oyprididae, there are 2 diagonal bands of a 

 ghter hue, running on either side from the centre of the shell 

 wards the posterior extremity and indicating the place where 

 ie coecal appendages of the intestine and the ovaries lie imbed- 

 id between the lamellae of the valves. 



' its outer faces. Its structure agrees exactly with that in the 



iliar little apppendage o 

 This appendage (fig. 9), 



the whole rather 



