CERITHIDEA.— Plate I. 



striated beneath, outer lip mucli expanded, sonie- 

 wliat flattened, produced in front of the canal. 



Wood, Snpp. 4. pi. 4. f. 8. 



Hub. Malacca. 



This well-known shell frequently loses its apex. 



Species 5. (Mus. Cuming.) 



Ceritiiidea quadrata. Ca\ testa pyramidali, fmcd, 

 spiralili'r sulcata, longitudinaliler crebri-costatd ; an- 

 fractibus rectiusndis, idlimo itifrn quadrnto, lubro ex- 

 panso, aiitice prodiicto. 



The square Cerithidea. Shell pyramidal, brown, spi- 

 rally grooved, longitudinally closely ribbed: whorls 

 rather straight, the last square beneath, outer lip ex- 

 panded, produced in front. 



SOWERBY. 



Hab. Malacca. 



Species 6. (Mus. Cuming.) 



Cerithidea Kieneri. Cur. testa pyrmnidatd, fused, spi- 

 raliter sulcata, longitudlnalUcr costatd, costis distaii- 

 tibus nodidosis ; anfractihus iiumerosis, rotttndis, labro 

 valde expanso, aide canalem prodiiclo. 



Kiexer's Cerithidea. Shell pyramidal, brown, spi- 

 rally grooved, longitudinally ribbed, ribs distant, no- 

 dulose ; whorls numerous, rounded, outer lip much 

 expanded, produced in front of the canal. 



HOMBRON. 



Hab. Philippines and Borneo. 



This is a much narrower shell tiiau C obtiisa, and the 

 ribs are more distant. 



Species 7. (Mus. Cuming.) 



Cerithidea sacrata. Cer. testa fusco-idgrescenfi, tenui, 

 Irevi, elongald ; anfractibus iiiniierosis, siibrotutidh, 

 InngdudinaUter coslafis, spirnUter siibsidcafis, medio 

 albo-ttsniatis, costis nodiferis, varice ittio, laterali ; 

 aperturd subquadratd, labro crasso. 



The dedicated Cerithidea. Shell blackish-brown, 

 thin, smooth, long ; whorls numerous, rather rounded, 

 longitudinally ribbed, spirally suloated, with a white 

 band in the middle, ribs nodulose, a single lateral 

 varix ; aperture subquadrate, outer lip thick. 



Gould. 



Hab. California. 



This shell approximates nearly to C. varicosa, but it is 

 not, like that species, strongly reticulated. 



Species 8. (Mus. Cuming.) 



Cerithidea Mazatlanica. Cer. testa uigrescetdi, crassd, 

 li.ris spiralibiis et costis nodulosis cancellatd, unicari- 

 cosd ; anfractibus subrotitndis, medio fusco-tceniatis ; 

 aperturd suhpurpured, labro crasso, siiiuato. 



The Mazatlan Cerithidea. Shell rather black, thick, 

 cancellated with nodulose ribs and spiral ridges, with 

 a single varix ; whorls rather rouiul, with a brown 

 band in the middle ; aperture rather purple, outer lip 

 thick, sinuous. 



Carpenter. 



Hab. Mazatlan. 



Small, and darkly coloured, with only one varix, but in 

 general characters rather closely resembling C. varicosa, of 

 which it is perhaps only a variety. 



