CEEITHIUM.— Plate XY. 



spiraUter minute striata; anfractihus brevibiis, rec- 

 tiusculis, triserialim tubemdiferis ; apertiird subquad- 

 ratd, columella rectiusculd, canali brevi. 

 The Californian Cerituium. Shell short, oval, ob- 

 tuse, white, painted with dark, square, irregular 

 spots, spirally miuutely striated ; whorls short, rather 

 straight, with tubercles in three rows ; aperture 

 rather square, columella rather straight, canal short. 



SOWEKBY. 



Hab. California. 



The tubercles, in three spiral rows, are of a peculiar 

 oblong form, and very prominent and regular. 



Species 105. (Mus. Cuming.) 



Cekithium nivosum. Cerith. testa brevi, subventricosd, 

 alba, spiraliler striata ; anfractibus paucis, veidricosis, 

 triseriatim uoduli/eris ; aperturd expansd, labro intus 

 subcrentdalo, columella brevi, canali brevissimo. 



The snowy Cerithium. Shell short, rather ventricose, 

 white, spirally striated ; whorls few, ventricose, with 

 nodules in three rows; aperture expanded, outer lip 

 slightly crenulated within, columella short, canal very 

 short. 



Sowerby, Thes. Conch, sp. 115. f. 205. 



Hab. ? 



Species 106. (Mus. Cuming.) 



Ceuithium c^latum. Gerith. testa conico-pyramidatd, 

 jialUdd, anfractibus novem, rectiusculis, tuberculorum 

 seriebus tribus armaiis, tuberculis productis, longitudi- 

 naliter oblongis, suturd excavatd ; anfractu ultimo in- 

 fra, bicostalo ; aperturd subovali, canali brevi, aperto. 



The embossed Cerithium. Shell conically pj'ramidal, 

 pale ; whorls nine, rather straight, armed with three 

 rows of tubercles, tubercles prominent, lougitudiually 

 oblong, suture excavated ; last whorl with two ribs 

 beneath ; aperture rather oval, canal short, open. 



Gould, Otia, p. 62. 



Hab. Tierra del Fueuo. 



Species 107. (Mus. Cuming.) 

 Cerithium Kissoide. Cerith. testa parvd, suboeutri- 

 cosd, acuminatd, albd ; anfractibus paucis, spiraliler 

 striatis, longitudinaliter plicatis, ad suiuram supra et 

 infra medium triserialim tuberculiferis, suturd sub- 

 excavatd, rdtimo anfractu infra alternatim lirato ; 

 aperturd ovali, labro expanse, intus incrassato, valide 

 plicato, columelld brevi, canali brevissimo, aperto. 

 The Eissoa-like Cerithium. Shell small, rather ven- 

 tricose, acuminated, white ; whorls few, spirally stri- 

 ated, longitudinally plaited, with three rows of tu- 

 bercles at the suture, and above and below the centre, 

 suture rather hollow ; last whorl alternately ridged 

 beneath; aperture oval, outer lip expanded, thick- 

 ened within, columella short, canal very short, open. 



SOWERBY. 



llab. Island of St. Thomas, West Indies. 



Species 108. (Mus. Cuming.) 



Cerithium Thomasije. Cerith. testa subventricosd, albd, 

 sparsim ruhro-iaacHlatd, longitudinaliter plicatd, plicis 

 tuberculis rotundis, Icevibus quatuor armatis, interstitiis 

 spiraliler striatis ; anfractu ultimo infra costato, inter 

 costo.s minute lirato ; aperturd subovali, labro expanso, 

 intus incrassato, plicato, canali obliquo, brevi, semi- 

 clauso. 



St. Thomas's Cerithium. Shell rather ventricose, white, 

 with a few reddish spots, longitudinally plaited, 

 plaits armed with four round, smooth tubercles, in- 

 terstices spirally striated; last whorl ribbed beneath, 

 between the ribs minutely striated ; aperture rather 

 oval, outer lip expanded, thickened and plaited with- 

 in, canal oblique, short, partly closed. 



SoWERBY. 



Hab. Island of St. Thomas, West Indies. 



