Manchester Memoirs, Vol. xli. (1897), No. 1. 25 



YOLDIA TROPICA, Sp. 110V. (PL J, f. 29). 



Y. testa oblonga, trapezioide, temii, Iczvissima, spiraliter 

 striatula, epidevmide olivacea contecta, antice prolongata subro- 

 striata, postice brevi, rotundata, mavgine ventrali recto, dorsali 

 declivi, umbonibus parvis, lunula angustissima, dentibus anticis 

 septemdeeim, posticis quatuordecim,pectinaceis, intus albo-lactea. 



Alt. io 7 lat. 18, diam. 7*25 mm. 



Hab. Karachi. 



One perfect example of an interesting shell, of which 

 one valve also exists, unnamed, in the National Collection. 

 It is thin, covered with an olivaceous epidermis, spirally 

 finely striate, squarely elongate. Slightly swollen towards 

 the umbones, which are small, anteriorly prolongate, 

 posteriorly short and rounded, ventrally straight, dorsally 

 slightly sloping on each side of the umbones. The 

 anterior comb-like teeth are 17, the posterior 14 in 

 number. Within the shell is milky-white. 



c 



