CEEITH IDEA.— Plate IV. 



Species 27. (Mus. Cuming.) 



Cerithidea bicauinata. Cer. testa pyraniidaU^fmco- 

 nlgricaute, ad sutiiram alLo-lineald, lu)igitiidiualiter 

 costatd, infra spiraliter acute iicarinatd ; aperturd 

 mbquadi-atd, cunali sid)prorJucto. 



The bicarinated Cerithidea. Sliell pyramidal, brown- 

 ish-black, with a white line at the suture, longitudi- 

 nalh' ribbed, spirally shai^ply two-keeled beneath ; 

 aperture rather square, canal slightly produced. 



Gray, Fauna of New Zealand. 

 Cmthiimi tiitulentum, Kiener. 



Halj. New Zealand. 



Species 28. 



Cerithidea subcarinata. Gcr. teiitdparva,l(Evi,fusco- 

 rdyricaHte, longiludbialiler costata, wfra spiratiter 

 tricarinatd ; aperturd parvd, subrotimdd, lubro paulo 

 producto, canali brevi, profunda. 



The subcakinated Cerithidea. Shell small, smooth, 

 blackish-brown, longitudinally ribbed, spirally trica- 

 rinate beneath ; aperture small, rather round, outer 

 lip a little produced, canal short, deep. 



SOWEUBY. 



Hub. New Zealand. 



A curious little brown shell, showing three rather ob- 

 scure ribs at the lower part of the last whorl. 



Species 29. (Mus. Cuming.) 



Cerithidea pulchra. Cer. testa pyramidali, soUda, 

 veiitricosd, spiraliter liratd, longitiidinaliler costatd, 

 fused, albo et fusco-nigricante fusciatd, costis nodosis, 

 arcuatis ; anfractibus rotundis, ultimo infra carina- 

 to, infra carinam. striato ; aperturd magna, rotunda, 

 columeJld subplanulatd, canali angnstu, lubro late 

 expanse, uigro. 



The beautiful Cerithidea. Shell pyramidal, solid, 

 ventricose, spirally ridged, longitudinally ribbed, 

 brown, banded with white and blackish-brown, ribs 

 nodose, curved ; whorls round, the last keeled below, 

 striated under the keel ; aperture large, round, colu- 

 mella rather flat, canal narrow, outer lip widely ex- 

 panded, black. 



C. B. Adams. 



Hab. Panama. 



More solid than C. Montagnei, the whorls crossed by 



strise, and the ribs consequently nodose. The outer lip 



is black. 



