Daix. — Mollusca and Brachiopoda. 



PLATE 12. 



Cavolina occidentalis Dall, with the animal fully expanded, drawn from life 

 by W. H. Dall ; max. lat. 22.0 mm. ; p. 233. 



The same with tlie pteropodia partly folded preparatory to their with- 

 drawal into the test ; width about 12 mm. 



View of the "head" from above, showing the notched junction of the 

 pteropodia and the strongly contrasted asymmetrical eye pedicels, much 

 magnified. 



Irenosyrinx persimilis Dall ; alt. 100.0 ram. ; p. 271. 



Leucosyrinx ? pacijica Dall ; alt. 23.0 mm. ; p. 270. 



Murex ( Tritonalla) diomedaeus Dall, vertical view showing varices ; p. 313. 



The same, alt. 29.0 mm. ; p. 313. 



Fusinus fragilissiynus Dall, alt. 21 mm. ; p. 301. 



Trivia panamensis Dall, profile view, Ion. 4.2 mm. ; p. 324. 



Trivia atomaria Dall, profile view, Ion. 3.2 mm. ; p. 323. 



Trivia panamensis Dall, basal view, p. 324. 



Trivia atomaria Dall, basal view, p. 323. 



The same, dorsal view. 



Trivia panamensis Dall, dorsal view, p. 324. 



Figures 3 and 7-12 were drawn by the late Dr. J. C. McConnell, the others by 

 Miss Evelyn Mitchell. * 



