CERITHIUM.— Plate XVIII. 



Species 138. (Mus. Cuming.) 



Cerithtom inscolptum. Ceritk. testa devatd, siib- 

 acundnatd, caniled ; aiifractibus rectiascuUs, ad su- 

 turam rotuiidis, albo-fasciatis, spwaliter distanter sul- 

 caiis, ultimo rotundo ; aperturd rotunda, castaned, 

 colnmelld brevissimd, canali brevissimo, aperto. 



The unsculptured Cerithium. Shell elevated, slightly 

 acuminated, blue ; whorls rather straight, rounded at 

 the suture, white-bauded, spirally distantly sulcated, 

 the last round ; aperture round, chestnut colour, 

 columella very short, canal very shoi-t, open. 



SOWEEBY. 



Hab. South Australia. 



Species 129. Mus. Cuming.) 



Cekithium l.^certinum. Cerith. testa elongatd, sub- 

 venlricosd, fused j anfractibus numerosis, ad margiuem 

 crenulatis, costis tuber cuViferls quatuor cinciis, costis 

 duabus superioribus approximatis, alteris magis distaii- 

 tibus, interlineatis ; aperturd subrotundd, columeUd 

 alba, reetiusculd, canali brevissimo, aperto, labro tenui. 



The lizard Cerithium. Shell long, rather ventricose, 

 brown ; whorls numerous, crenulated at the edge, 

 girt with fom- tubercled ribs, the two upper ribs near, 

 the others more distant, with an interstitial line; 

 aperture rather round, columella white, rather straight, 

 canal very short, open, outer lip thin. 



Gould, Otia, p. 141. 



Eab. Sydney Harbour, U.S. 



This shell differs from C. Lima materially in sculpture. 



Species 129. (Mus. Cuming.) 



Cerithium tenue. Cerith. testa parvd, angiistd, tenui, 

 longitudinaliter plicatd, spiraliter crebricostatd, alba, 

 fusco variegatd ; aperturd subrotundd, columella brevi, 

 canali brevissimo, labro intns crenulato. 



The thin Cerithium. Shell small, narrow, thin, lon- 

 gitudinally plaited, spirally closely ribbed, white, 

 varied with brown ; aperture rather round, columella 

 short, canal very short, outer lip crenulated within. 



Sowerby, Thes. Conch. Cerithium, sp. 119. f. 212. 



Hab, Port Lincoln. 



This little species is usually dark-banded at the sutures 

 and at the lower part of the last whorl. Our Figure 130 « 

 represents a variety, with only a small chestnut spot on 

 the last whorl. 



Species 131. (Mus. Cuming.) 



Cerithium glariosum. Cerith. testd elongatd, angusid, 

 nigrescetite ; anfractibus numerosis, rectiusculis, fu- 

 berculorum seriebus quatuor cinctis, longitudinaliter 

 plicatis, suturd excavald, aperturd parvd, canali bre- 

 vissimo. 



The gravelly Cerithium. Shell long, narrow, blackish; 

 whorls numerous, rather straight, girt with four rows 

 of tubercles, longitudinally plicated, suture excavated ; 

 aperture small, canal very short. 



Gould, Otia {Bitiium). 



Hab. Loochoo Islands and Bonin Islands. 



