360 PROCEEDINGS OF THE ACADEMY OF [NoV,, 



MARINE MOLLUSKS OF HAW AH— XIV, XV. 



BY HENRY A. PILSBRY. 



Part of the Hawaiian tectibranch mollusks were considered in 

 part II of this series. ^ Others were found in the Bryan and Thaa- 

 num collections, and in material taken in 1913. Probably further 

 additions can be made when material collected this year is assorted; 

 but as the following revision has already been held some time 

 awaiting the preparation of illustrations, it is thought best to publish 

 at this time. 



Very little is known of the ecology of Hawaiian Tectibranchs. 

 Collectors of living specimens should note their stations and such 

 conditions as can be observed. 



Little additional information has come to hand on the Aplysioid 

 and Notaspidian Tectibranchs since the publication of Manual of 

 Conchology, Vol. XVI, in which the known species are described. 



Key to Hawaiian genera of cephalaspidian Tectibranchs. 



1. Shell an open, flat spiral, wholly concealed, the mantle concres- 



cent over it Aglaja Ren. 



Shell not covered by the mantle 2 



2. Spire exposed 3 



Spire deeply sunken or concealed 6 



3. Spire more or less conic, the apex not depressed 4 



Spire convex or level, apex not projecting above the following 



whorl Hydatinidoe. 



4. Larger shells, with a strong columellar fold or a basal truncation ; 



spiral grooves punctured when present 5 



Smaller, white shells with a weak columellar fold and without 

 punctured spiral grooves; apical whorl tilted on edge. 



Acteodna Gray. 



5. Columella having a strong, bilobed fold above, concave below; 



imperforate Pupa Bolt. 



Columella straight, with a small fold above and obliquely truncate 

 at base; shell oval, with close spiral sculpture; perforate. 



BuUina Fer. 



1 Proc. A. N. S. Phila., 1917, p. 214. 



