454 MAZATLAK UNIVALVES 



vol. ix. p. 521, no. 2Q—MJce. in Zeit. f. Mai. 1847, p. 182, 

 no. 22 -.—do. 1851, p. 18, no. 83.— C. B. Ad. Pan. Shells, p. 128, 

 no. 146. 



Ficula ventricosa, Chen. HI. Conch, pi. 1, f. 1, pi. 2, f. 1. 



Bulla decussata, Wood, Ind. Test. Suppl. pi. 3, f. 3. 



Ficula decussata, Rve. Conch. Ic. pi. 1, f. 3. 



The existence of this remarkable shell in the Mazatlan fauna, 

 is not yet satisfactorily ascertained. It was entirely absent 

 from the L'pool Col. ; but Mr. Hanlej' states that a very few 

 specimens were sold at the auctions with the Havre Col. It 

 occurs in Menke's list ; but the shells collected by Melchers 

 were mixed with bought specimens. In Dr. Gould's collections, 

 a specimen occurs, marked doubtfully from Mazatlan by 

 Lieut. Green. It appears to be rare every where. 



Sah. — Panama; 8 dead sp. ; C. B. Adams. — Taboga, Col. 

 Jewett.—S. W. Mexico, 1 sp. P. P. C— San Bias, Kiener.— 

 ? Mazatlan, Lieut. Green : — do. extremely rare ; ? Havre Col.} 



Family TEITONID^. 

 Teeth in seven series, as in Natica. 



Genus TEITON, Lam. 



Lam. An. s. Vert. Ed. I. vol. vii. p. 176. 



Tritonium, Cuv. 1817.— Phil. Handh. Conch, p. 143.— S". Sf A. 

 Ad. Gen. vol. i. p. 101. 



The familiar Lamarckian name is retained, because Tritonium 

 is often employed in a different sense, as bj' Middendorff for 

 Chrysodomus, &c., and also because it too nearly resembles 

 Tritonia, a genus of Nudibranchs. 



Subgenus AEGOBUCCINTBi:, Klein. 



Argobuccinum + Lagena, H. Sf A. Ad. Gen. vol. i. p. 104. 

 Cassidaria, pars. Hinds. 



580. Aegobuccinum nodosum, Chemn. 



Argo-buccinum nodosum, Chemn. Conch. Cab. vol. iv. p. 98, 

 pi. 131, f. 1255-6, (1780.) 



