404 MESSRS. MELVILL AND STANDEN ON [June 18, 



Columbella (Mitrella) nomadica l , sp. n. (Plate XXI. 

 fig. 7.) 



C. testa fusiformi, oblong a, robusta, perlcevi, parum nitida, solida ; 

 anfractibus 8-9, quorum apkales tres Iceves, parvi, uni- 

 colores, cceteris albis, nigro-brunneo arete reticularis, interstitiis 

 rotundis, infra, ju.rta sutureu hie illie permaynis, eonspicuis, 

 anfraciu ultimo versus basim spiraliter sulculoso ; apertura 

 oblonga, labro e.vtvs crassiusculo, intv.s denticulato ; columella 

 simplici. 

 Lat. 8, lowj. 3 mm. 

 Hab. Karachi. 



With a considerable resemblance to C. cribraria Lam. of the 

 New World, this species is somewhat larger and coarser in detail ; 

 it is a particularly handsome form, and now that it has been 

 differentiated will be probably considered very distinct. 



Columbella (Mitrella) zebea Gray ( = miser Sowb.). 



P.G. Linjah. 



M.C. Not infrequent, under stones at low water. 



Mr. Pace writes : " A very elate and pale form of the species 

 known usually as C. miser Sowb., agreeing perfectly with the type 

 of C. elata Eeeve ; but the latter is recorded, perhaps erroneously, 

 to come from California." 



Columbella (Anachis) rugulosa Sowb. 

 I. Karachi. 



Columbella (Anachis) Terpsichore Leathes. 



M.C. Often on mud-covered rocks at low tide. 

 I. Bombay (Abercrombie). 



Mr. Pace notes on a specimen of gigantic dimensions (prob. 

 C. miser) from Mekran Coast, that it " in some respects approaches 

 C. terpsichore Leathes." Here we see the frequent futility of 

 subgeneric distinctions ; in the text-books the three nearly allied 

 Columbellae are at present placed in three subgenera, viz. : — 



C. (Atilia) elata Reeve. 



C. {Mitrella) miser Sowb. 



C. {Anachis) terpsichore Leathes. 



Columbella (Atilia) albinodulosa Gask. 

 M.C. Local. 



This was at first referred to G. nivosa Reeve, the body-whorl 

 being slightly nodulous and the brown maculation more intense. 



Columbella (Atilia) compressa Gask. 

 I. Karachi. An Erythraean species. 



Columbella (Atilia) conspersa Gask. 



P.G., I. No precise localities ; also dredged off Ceylon ( W. A. 

 Tindall). — Mr. S. Pace deems this synonymous with, at all events, 



1 nomadica, from the likeness in marking to the " opvi9 vofiaSuca," or 

 Guinea-fowl. 



