C E R I T H I U M . 



Plate XVII. 



Species 117. (Fig- a, b, Mus. Cuming.) 



Cekithium costifeeum. Cerith. testa, angustatd, tentii, 

 elongatd, fulvd, spiraliler coslatd ; anfractibns »u- 

 merosis, apicalibus angudissinih, medianis injlatis, aii- 

 gulatis, lougitudinalUer costiferis, ultimo contraclo, 

 infra coda spirali cincto ; aperturd pand, varice co- 

 lumellari crasso subreflexo, canali fere clauso, labro 

 expanso, fasciatim picto. 



The ribbed Cerithium. Shell narrow, thin, long, 

 pale-brown, spirally ribbed ; whorls numerous, those 

 near the a])ex narrow, those in the centre inflated, 

 angular, longitudinally ribbed, the last contracted, 

 encircled beneath with a spiral rib ; aperture small, 

 columcllar varix thick, rather reflected, canal nearly 

 closed, outer lip expanded, banded. 



A. Adams, Sowerby's Thes. Conch. Cerith. 7. 220. 

 Cmtliinm costatum, Sowerby (by error). 



Hab. ? 



Eather more solid, more ventricose, and more strongly 

 ribbed than C. luacrostonia. 



Species 118. (Fig. a, b, Mus. Cuming.) 



Cerithium macrostoma. Cerith. tentd gracili,elongaid, 

 pallide fulvd, tenui, spiraliter striatd, longitudinaliter 

 creberrinie costatd ; anfractibus numerosis, medianis 

 subinflatis, uUimis duobus coitiracHs ; aperturd ovali, 

 varice columellari crasso, canali fere clauso, labro valde 

 expanso, fasciato. 



The large-mouthed CERixmrJi. Shell narrow, long, 

 pale-fulvous, thin ; spirally striated, longitudinally 

 and closely ribbed ; whorls numerous, the central 

 ones slightly inflated, the last two contracted ; aper- 

 ture oval, columellar varix thick, canal nearly closed, 

 outer lip much expanded, banded. 



Hinds, Voy. Sulph. pi. svi. f. 12. 



Hab. Borneo. 



A very thin and slender species. 



Species 119. (Mus. Cumiug.) 

 Cerithium T/Eniatum. Cerith. testd ventricosd, pgrami- 



datd, spiraliter striata, pallide filled, ad arifraclum 

 ultimiim et apertiiram spiraliter fusco-rahescente tcc- 

 niatd ; anfractibus numerosis, apicalibus angnlutis 

 angustissimis, medianis injlatis, infra prope suturam 

 angulatis, pliciferis, ultimo subcontracto, siiprd pli- 

 cato ; aperturd ovald, colitmelld breoi, alba, canali brevi, 

 aperto, labro tenui, pauliilum refiexo. 



The ribanded Cerithium. Shell ventricose, taper- 

 ing, spirally striated, pale-fulvous, ribanded with 

 reddish-brown on the last whorl, and in the aperture ; 

 whorls numerous, those of the apex angular and very 

 narrow, those in the centre ventricose, angular and 

 plicated beneath, near the suture, the last rather 

 contracted, plaited above ; aperture oval, columella 

 short, white, canal short, open, outer lip thin, a little 

 reflected. 



Sowerby. 



Hab. Cape Natal. 



Eesembling Cerillimm pingue, but m\ich narrower, with 

 the plaits on the last whorl much smaller and more nu- 

 merous. 



Species 120. (Fig. a, b, Mus. Cuming.) 



Cerithium contractum. Cerith. testd solidd, ventri- 

 cosd, spiraliter creberrinie striatd, longitudinaliter 

 plicatd ; anfractibus apicalibus angustatis, medianis 

 inftatis, infra medium angulatis, costis tubercnlaribns 

 subobliquis armatis, ultimo valide contraclo ; aperturd 

 obliqud, colnmelld Ijrevi, aperto, labro tenui, lineis ru- 

 bris picto, infra expanso. 



The contracted Cerithium. Shell solid, ventricose, 

 spirally closely striated, longitudinally plaited ; api- 

 cal whorls narrow, central inflated, angular below 

 the middle, armed with tubercular, rather oblique 

 ribs, the last much contracted ; aperture oblique, 

 columella short, canal short, open, outer lip thin, 

 marked with red lines, expanded Ijeneath. 



SowEEBT, Thes. Conch. Cerithium, no. 12i. f. 218. 



Hab. Cape Natal. 



A much narrower and more solid shell than Cerithium 

 pingue. 



December, 186.5. 



