CEEITHIUM.— Plate X. 



Species 68. (Mus. Cuming.) 



Cerithium Nov.e-Hibeeni/e. Ceriih. tesld elungntd, 

 albil, minute striata, aiifractibiis medio aiigulatis, lon- 

 gitudinaliter distanter plicatis, plicis magiiis nodosis, 

 medio angulatis, ultimo anfractu biseriaiim noduliferis, 

 aperturd subqitadratd, columelld brevi, caiiali brevis- 

 simo, aperto, labro iiitii.'i crenato. 



The New-Ireland Cerithiom. Shell elongated, white, 

 minutely striated, whorls angulated in the centre, 

 longitudinally distantly-plicated, the plaits large, tu- 

 berculated, angulated in the middle, aperture rather 

 square, columella short, canal very short, open, outer 

 lip crenulated within. 



A. Adams, Sowerby's Thes. Couch. Cerithium sp. 33. 



Hab. Florida. 



A white species, with large angular tubes. 



Species 69. (Fig. a, b, Mus. Cuming.) 



Cerithium munitum. Cerith. testa fyramidatd, alba, 

 varicosd, aufraciibus numei'osis, medio angulatis, longi- 

 tudinaliter pliciferis, spiraliter costis nodosis validis 

 cinclis, ultimo infra costis duabus ad plicas in tuber- 

 culis magnis productis, aperturd subrotundd, columelld 

 rectiusculd, canali brevi, labro acute laqueato. 



The fortified Cekithium. Shell tapering, white, va- 

 ricose, whorls numerous, angular in the middle, lon- 

 gitudinally plicated, spirally circled with strong tu- 



berculated ribs, the last with two ribs produced on 

 the plicae into large tubercles, aperture rather rounded, 

 columella rather straight, canal short, outer lip 

 sharply fluted. 



Philippi, Enum. Moll. Sicil. 



Hub. Mediterranean. 



A species of pyramidal form, distinguished by two large 

 ribs encircling the last whorl, which are produced on the 

 plaits into large angular tubercles. 



Species 70. (Mus. Cuming.) 



Cerithium gemma. Ceriih. testa oblongd, spiraliter 

 striata, albidd, avfractibus subventricosis, tuberculis in 

 seriebus tribus instructis, maeulis nigrescentibus super 

 tubercula duobus alternis pictis, aperturd brevi, ovatd, 

 columella rectiusculd, canali brevi, labro crenato, in- 

 crassato. 



The gem Ceiuthium. Shell oblong, spirally striated, 

 whitish, with whorls a little ventricose, set with tu- 

 bercles in three rows, with black spots painted on 

 them iu alternate twos, aperture short, oval, columella 

 rather straight, canal short, inner lip thick. 



SowERBY, Thes. Conch. Cerithium sp. 105. 



Hab. Island of Luzon, Philippines. 



The regularly set tubercles present a gem-like appear- 

 ance, and are neatly painted with dark-brown in alternate 

 couples. 



