10 Dr. J. C. Melvill on Marine MoUusca 



Cerithium trigonostomum, sp. n. (PI. I. fig. 15.) 



C. testa parva, regulari, fusiformi, pallide ochracea vel alba ; an- 

 fracfcibus 11, quorum apicalis perminutus, laevis, caeteris ad 

 suturas impressis, regulariter costulatis, costis utrinque gemmu- 

 latis, ad medium spiraliter uniliratis, superficie rugosa, ultimo 

 anfractu multilirato, pra3cipue ad basin, et bino gemmularum 

 ordine ad costas infra peripheriam decorato ; apertura subtrigona, 

 labro recte effuso, obtusangulo, breviter ad basin rostrato. 



Long. 6 - 75, lat. 2 mm. 



Hob. Mekran Coast, Charbar, 40 fathoms. 



A few examples only of a neat little Cerithium, with 

 regularly chased whorls, there being two rows of beading on 

 the riblets on either side of the sutures, a strong median lira 

 dividing them. The body-whorl is well furnished with liree 

 below the periphery to the base. Mouth subtrigonous, outer 

 lip somewhat angled and prominent, shortly beaked basally. 



Cerithiopsis eutreta *, sp. n. (PI. II. fig. 16.) 



C. testa minuta, attenuato-cylindrica, tenui, ochro-cinerea ; an- 

 fractibus ad 10, quorum apicales 3 ochracei, laeves, caeteris ventri- 

 cosulis, ad suturas impressis, ad medium spiraliter tribus carinulis 

 deeoratis, ultimo quatuor, infra et supra, juxta suturas, spatio 

 intervallari praeditis, quod, cum interstitiis inter carinas spirales, 

 minute fovcolatum et alveatum est ; apertura ovata, labro paullum 

 effuso, tenui, columella excavata, canali producto. 



Long. 3, lat. 1 mm. 



liab. Persian Gulf, Henjam Island. 



With C. henjamensis one specimen only of a distinct little 

 shell occurred, its sculpture being peculiar. Ten-whorled, 

 the three apical being smooth, the remainder thrice spirally 

 keeled, these keels being approximate to each other ; on 

 either side between them and the sutures the surface is plain 

 but much pitted and honeycombed; the same alveate con- 

 dition obtains between the spiral keels, of which the body- 

 whorl possesses four, with curtly angled base, and plain ; 

 the mouth oval, columella slightly excavate. 



Cerithiopsis henjamensis, sp. n. (PL IT. fig. 17.) 



C. testa parva, angusta, attenuato-cylindrica, laete ocbraceo- 

 brunnea, solidula ; anfractibus ad 13, quorum apicales 3 laevissimi, 

 vitrei, ochracei, caeteris ad suturas haud multum impressis, tri- 

 plici gemmarum spiralium serie arete praeditis ; anfractu ultimo 



* evrprjTos, honeycombed. 



