OF MOLLT78CA. 13 



4. T. tuberosum, t. 4. f. 1-6. 



5. T. pileare, t. 4. f. 3 <? . 



6. T. chlorostomum, t. 85. f. 2? . 



7. T. cancellatum, t. 265. f. 2. 



8. T. rubecula?, t. 85. f. 3. 



9. T. Spengleri, t. 4. f. 5. 



10. T. album (Nassaria a.), Adams, Gen. Moll. t. 13. f. 1. 



11. T. ?, Middendorf, M. R. t. 



The tentacles of Triton tuberosum are separate at the base ; the 

 proboscis is elongate. Teeth 3*1*3; the central one with a central, 

 large, and three smaller denticles on each side ; the inner lateral 

 tooth transverse, denticulated on its inner front edge ; the two outer 

 teeth subulate, curved. The operculum is ovate, rounded at each 

 end, with a subapical marginal nucleus. The animal and teeth of 

 T. subdistortum and T. chlorostomum were similar. 



3. EUTHRIA. 



A Triton, with abortive or rudimentary varices. Canal elongate, 

 rather bent up. Operculum ovate ; nucleus apical. 



1. E. lignaria, t. 89. f. 3, 9. 



** Operculum small, broad, sab trig onal ; nucleus apical; varices 

 acute, foliaceous. 



4. Persona. 



Shell ovate ; spire conic, with three sharp-edged dilated varices 

 on each two whorls ; aperture sinuous ; lip veined. Operculum small, 

 broad. 



1. P. anus, t. 85. f. 4. 



2. P. cancellina, Adams, Gen. Moll. t. 11. f. 2. 



The head of Persona anus is truncate ; the tentacles subulate ; pro- 

 boscis elongate. Teeth 3 • 1 * 3 ; central with three small lateral and 

 one much larger central denticle ; the inner lateral transverse, den- 

 tated on the inner part of edge ; the two outer lateral conical, sub- 

 ulate, arched. The operculum triangular, as broad as long. 



Fam. XV. VERENADiE. 



Shell thin, ventricose, keeled, umbilicated. Aperture larger than 

 the spire, compressed into a partial canal in front. Periostraca 

 horny, rising into hairs at the angles of the shell. The axis placed 

 considerably to the left of the canal. Operculum horny ; nucleus 

 on the front of the outer edge. 



This family is the Buccinoid representative in this group. 



