454 MAZATLAN UNIVALVES 
vol. ix. p. 521, no. 29.—Mke. in Zeit. f. Mal. 1847, p. 182, 
no. 22 :—do. 1851, p. 18, no. 83.—C. B. Ad. Pan. Shells, p. 128, 
no. 146. 
Ficula ventricosa, Chen. Ill. Conch. pl. 1, f. 1, pl. 2, f. 1. 
Bulla decussata, Wood, Ind. Test. Suppl. pl. 3, f. 3. 
Ficula decussata, Rve. Conch. Ic. pl. 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. Hanley 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. 
Hab.—Panama; 8 dead sp.; C. B. Adams.—Taboga, Col. 
Jewett.—S. W. Mexico, 1 sp. P. P. C.—San Blas, Kiener.— 
? Mazatlan, Lieut. Green :—do. extremely rare; ? Havre Col. | 
Famity TRITONIDA. 
Teeth in seven series, as in Natica. 
Genus TRITON, Lam. 
Lam. An. s. Vert. Ed. I. vol. vii. p. 176. 
Tritonium, Cuv. 1817.— Phil. Handb. Conch. p. 143.—H. & A. 
Ad. Gen. vol. i. p. 101. 
The familiar Lamarckian name is retained, because Tritonium 
is often employed in a different sense, as by Middendorff for 
Chrysodomus, &c., and also because it too nearly resembles 
Tritonia, a genus of Nudibranchs. 
Suscenus ARGOBUCCINUM, Klein. 
Argobuccinum + Lagena, H. & A. Ad. Gen. vol. i. p. 104. 
Cassidaria, pars, Hinds. 
580. ARGOBUCCINUM NoDosuUM, Chemn. 
Argo-buecinum nodosum, Chemn. Conch. Cab. vol. iv. p. 98, 
pl. 181, f. 1255-6, (1780.) 
