CEEITHIUM.— Plate XIX. 





Species 137. (Mus. Cuming.) 



Ceeithium elongatum. Cerith. testa attenuatd, fusco- 

 mgrescente, longitudiyialiter oblique pUcatd, plicis m- 

 lidis tuberculom; anfractibus obliquis, ventricosis, 

 sutnrd excavata ; apertvrd ovatd, canali brevi, aperto. 



The elongated Cerithium. Shell attenuated, blackish- 

 brown, longitudinally obliquely plicated, plaits strong, 

 tuberculated ; whorls oblique, ventricose, suture ex- 

 cavated ; aperture oval, canal short, open. 



SowERBY, Thes. Conch. Cerithium, sp. 132. f. 233, 234. 



Hab. Australia; Strange. 



Species 138. (Mus. Cuming.) 



Cerithidm gracillimum. Cerith. testa attenuatd, fusco 

 nigrescente, longiludinaliter leviter plicatd, spiraliter 

 tuherculiferd ; anfractibus obliquis, subventricosis, su 

 turd subexcamtd ; aperturd parvd, canali brevi, aperto 



The very slender Cerithium. Shell attenuated 

 blackish-brown, longitudinally lightly plicated, sp 

 rally tuberculated ; whorls oblique, rather ventricose 

 suture slightly excavated ; aperture small, canal short 

 open. 



Sowerby. 



Hab. ? 



The shell is narrower than C. elongatum, the whorls less 



oblique, the longitudinal plaits less prominent, and the 



tubercles smaller. 



cylindraced, pallida, longitudinal iter plicatd, plicis 

 numerosis, validis, tuberculiferis ; anfractibus rectius- 

 culis, subquadratis, liris quatuor undulatis cinctis, 

 vltimo subtus bicostato, subtruncato, suturd valde ex- 

 cavatd ; aperturd subquadratd, canali brevissimo. 



The eoue-threaded Cerithium. Shell oblong-cylin- 

 drical, pale, longitudinally plaited, plaits numerous, 

 strong, tuberculated ; whorls rather straight, rather 

 square, girt with four undulating ridges, the last 

 with two ribs beneath, somewhat truncated, suture 

 deeply excavated ; aperture nearly square, canal very 

 short. 



Carpenter (Bittium). 



Hob. Mazatlan. 



Species 139. (Mus. Cuming.) 

 Cerithium quadrifilatum. Cerith. testd oblongo-sub- 



Species 140. (Mus. Cuming.) 



Cerithium eugatum. Cerith. testd oblongo-cylindraced, 

 pallida, longitudinaliter plicatd, plicis numerosis, sub- 

 obliquis, tuberculiferis; anfractibus numerosis, sub- 

 obliquis, liris tribus undulatis cinctis, ultima subtus 

 bicostatd, subfusiformi, suturd excavatd; aperturd 

 ovatd, canali brevi, columelld rectiusculd, acuta. 



The rugose Cerithium. Shell oblong - cylindrical, 

 pale, longitudinally plaited, plaits numerous, rather 

 oblique, tuberculated ; whorls numerous, rather ob- 

 lique, girt with three undulated ribs, the last double- 

 ribbed, subfiisiform beneath, suture excavated ; aper- 

 ture ovate, canal short, columella rather straight, 

 pointed. 



Carpenter. 



Hab. Santa Barbara. 



