402 MESSKS. MELVILL AND STA.NDEN ON [June 18, 



oblonga, labro extus la?vi,incrassato, intns 8-9-denticulato, denti- 

 culis albis vel (rarius) sanguineo-tinctis j columella jlexuosa, alba 

 vel sanguinea ; canali paullum recurvo. 

 Long. 9, lat. 2*50 mm. 



Hab. P.O. Bushire. Gulf of Oman, Maskat. 

 M.C. Charbar. Sandy mud, 5 fathoms. 

 An elegant species which, in Mr. Pace's opinion, is distinct from 

 all described, though near to C.pudica Braz. from the Torres Straits. 

 Prom this it would seem to differ in size, number of whorls, peri- 

 stome, though similar in disposition of markings and general form. 

 One Charbar example possesses the periostracum, thin, semitrans- 

 parent, sericeous, and olivaceous in colour. 



Columbella (Mitrella) alizonjE, sp. ii. (Plate XXI. tig. 5.) 



C. testa lo3vi, ovato-fusiformi, infra medium anfractus xdtimi 

 conspicue sulculosa ad basim, solida, straminea, plus minus 

 castaneo-maculata vel fasciata ; anfractibus octo, quorum tres 

 apicales vitrei, Iceves, cceteris vice ventricmis, IcBvissimis, irftimo 

 cceteros magnitudine sv/perante (7 mm.), tumidulo ; apertura 

 obliqua, oblonga, intus pallide violacea vel albescente, labro intus 

 circa quinque-denticulato ; columella quadri- vel quinque-tuber- 

 culata, nitida, paullulum incrassata ; canali lato. 



Long. 11-25, lat. 4' 50 mm. 



Hab. P.G. Shaikh Shuaib Island ; Bushire ; also dredged 

 lat. 27° N., long. 52° E., and 26° N., 57° K, on the telegraph- 



I. Lat. 18° 58' N., long. 71° 45' E., 40 fathoms. 



Variable only in disposition of marking and pattern ; the shell 

 being uniformly smooth, body-whorl tumid, the remainder hardly 

 ventricose ; apical whorls three, vitreous. Occasionally, as in the 

 specimens dredged at lat. 27° from the cable, they are wholly 

 brown or chestnut-coloured, with hardly any discernible pattern ; 

 and again, as in the Bushire examples, beautifully tessellate, having 

 on the body-whorl rounded spiral, regularly-arranged clear spaces 

 beneath the sutures, and a well-defined central fascia below. 



Mr. Pace considers this quite distinct from C. (Mitrella) dunkeri 

 Tryon (=varians Dnkr. prseocc). Upon carefully comparing it with 

 authentic specimens of this latter, to which it is certainly nearly 

 allied, we note, first, that G. alizonce possesses 8 as against 7 whorls, 

 that the body-whorl is bolder and more tumid, that the disposition 

 of marking is not so variable, C. dunkeri being either liueated, 

 longitudinally linear-striped, or transversely dotted, and reticulate 1 ; 

 and, lastly, the mouth-processes and denticulations are stronger and 

 better defined. The species, in fact, is larger and more solid in 

 every way. We dedicate this interesting form to Miss Alizon 

 Townsend, daughter of its discoverer. 



1 Some examples also being almost unicolorous lilac or salmon-coloured. 



