156 Dr. J. 0. Melvill on Marine Molhisca 



Hab. Karachi. 



Allied to D. porcatum, Gould, from Hongkong-, to which 

 at first I was inclined to allocate it. I am particularly in- 

 debted to Mr. J. R. le B. Tomlin for having, at my request, 

 carefully examined and compared it with its congeners in the 

 British Museum, and his verdict is as follows : — " I examined 

 the single example of D. porcatum in the Cumingian collec- 

 tion, which is, I fancy, a co-type, and has a label, pasted 

 underneath, in what I believe to be Gould's handwriting. 

 Your Karachi shell is very similar, but more tapering, and 

 possesses ribs running the whole length of the shell, whereas 

 in porcatum the alternate ribs stop abruptly about § of the 

 way" (in Jiff., Aug. 10, 1916). It gives me sincere pleasure 

 to baptize this neat species with Mr. le Brockton Tomlin's 

 name. 



Divaricella cypselis*, sp. n. (PI. V. fig. 33.) 



I), testa rot undo- globulari, parva albo-cinerea, delicatula, antice 

 dorsaliter excayata, postice leniter declivi, deinde circa mar- 

 ginem ventralem ro tun data, umbonibus contiguis, parvis, super- 

 flcie, spatio centrali valvae utriusque excepto, arctissime con- 

 centrice lirata, et antice, simul ac postice radiatim decussata, ad 

 jimcturas lirarum gemmata, valvis profunde convexis. 



Alt. 4, lat. 5, diam. 2*45 mm. 



Hob. Karachi, 20-30 fathoms. 



A small rounded species, with finely sculptured divaricate 

 liration, the surface of both valves being smooth centrally, 

 and finely radiately decussate both anteriorly and posteriorly. 

 The umbones are small, acute, shining. 



Phacoides malcolmensis, sp. n. (PI. V. fig. 32.) 



P. testa parva, fere rotunda, alba, arctissime concentrice lamellata, 

 lamellis paullulum flexuosis, hie illic irregularibus, supra, juxta 

 et infra umbones sub lente minutissime decussatis, umbonibus 

 prominulis contiguis, parvis, antice paullum excavata, deinde 

 rotundata, postice recte declivi marginem apud dorsalem, dentibus 

 normalibus. 



Long. 9 - 25, lat. 10 mm. (sp. map). 



Hab. Persian Gulf, Malcolm Inlet, 35 fathoms. 

 A small white species with a fugitive light olive epidermis, 

 very closely lamellate throughout. Only two or three 



* icti^6Xis, a chest or box. 



