MOLLUSCA OF INDIA. 177 



Size: maj. diam. 2"23, alt. axis I'G mm. 



Its nearest ally is K. nonqsteinensis (described in Part iii. p. 72, 

 Plate XVI. fig. 2), of the North-western Khasi Hills ; but it is 

 broader on the keel in proportion to height of spire and much 

 flatter on the base. 



Genus Taphrospika, W. T. Blf. 

 Taphrospira, W. T. Blf. P. Z. S. 1904, ii. p. 441. 



Original description : — " Testa depressa vel globoso-depressa^ tenuis, 

 cornea, ab iUd Macrochlamydis Bs., fossa spirali extra suturam in 

 omnibus anfractibus tantum diversa. 



" Typus T. convallata, Bs. Animal not known. 



" So far as is known, the following species should be referred to 

 this genus : — 



" T. convallata, Bens. Tenasserim. (Conch. Ind. pi. Ixxxviii. 

 figs. 2, 3.) 



" T. bathtjchara.v, Bens. MS. Andaman Islands. 



" T. compluvialis, Blf. Arakan Hills. (Conch. Ind. pi. Ixxxviii. 

 figs. 1, 4.) 



" T. excavata, n. sp. Hills south of Assam." 



Taphrospika bathtcharax, Bs. MS, (Plate CXI. figs. 1-1/.) 



A close ally of T. convallata, Bs. 



Locality. On the Analokatag Stream, Southern Andaman {O. 

 Rogers, Esq.). 



Animal ochraceous, dark grey on the extremity of foot ; mucous 

 gland overhung by a pointed termination (fig. 1). Sole of foot 

 divided ; usual peripodial grooves with a broad margin below. 



The right shell-lobe (fig. 1 a) is long and fairly broad at base, 

 and in life probably very extensible over the shell. The left shell- 

 lobe (figs. 1 & 1 fZ) is very broad and smooth and must spread over a 

 large surface of the shell. The dorsal lobes are all small, the left in 

 two parts, the posterior situated under the left shell-lobe and distant 

 from the anterior lobe. The wall of the branchial chamber is 

 sparsely spotted. The animal was in an excellent state of preserva- 

 tion, the generative organs at their full maturity (fig. 1 e). The 

 most notable thing is the absence of the amatorial organ. The 

 penis is elongate, there is a short kale-sac contiguous to the junction 

 of the vas deferens, followed by a moderately long epiphaUus, up to 

 the penis retractor muscle ; there is no caecum, the tube bends on 

 itself and soon expands into a convoluted mass with an indistinct 

 coiled appearance when looked at with transmitted light, thence it 

 becomes much narrower and leads away towards the generative 

 aperture. The above swollen portion looks as if we had here the 

 representative of the coiled caecum oi MacrocJilamys much modified 



