216 PROCEEDINGS OF THE CALIFORNIA 



radiis intensioribus longitudinalibus ornata ; annulis gracillimis, creberrimis, 

 rotundatis, baud elevatis circ. lxxx. ciucta ; interstitiis nullis ; sculptura Jongi- 

 tudinali nulla ; apertura acuta, vix contracts, vix declivi ; septo subungulato, 

 submucronato ; margine laterali recto; apice acuto, ad augulum circ. 45°, 

 maxime elevato ; operculo vix concavo, lira spirali elevata. 



Long. 0-14, lat. 0-04. 



Hab. San Diego, 8-10 fms., 12 ; Monterey, 20 fms., 20, some alive ; Santa 

 Barbara, 20 fms., 3, Cooper. 



Has the aspect, but not the sculpture, of an Elephantulum. 



Caecum Cooperi, Cpr. n. s. State Collection, No. 667a. 



O. (Anellum) t. parva, satis tereti, alba ; annulis crebris acutioribus, angus- 

 tis, circ. xxxiv.-xxxviii., interstitiis subconcavis ; septo subungulato ; apice 

 obtuso, baud elevato, margine laterali recto ; apertura declivi, parum contracto 

 et postice expanso ; operculo ? 



Long. 0-09. lat. 0-025. 



Hab. San Diego and Cataliua Island, 8-10 fms. 18, Cooper. 



Known from similar Mazatlan species by the very numerous but separated 

 and somewhat sharp ribs. 



Genus Turritella, Lamarck. 

 Turritella Cooperi, Cpr. n. s. State Collection, No. 564. 



T. t. valde tereti, tenuiore, cinerea, rufofusco tincta ; anf. plurimis, angustis, 

 subplanatis, suturis distinctis ; liris ii. et striulis crebris spiraliter ornata ; basi 

 angulata ; apertura subquadrata ; labro valde sinuato. 



Long. 1-80, long. spir. 1-50, lat. 0-45. 



Hab. San Pedro, 60 ; San Diego, 16 dead on beach ; Santa Barbara, 4 dead, 

 in 16-20 fms. Cooper. 



As I have seen no complete list of the very numerous fossil species of this 

 genus, it appears allowable, rather than risk a synonym, to name this graceful 

 shell after its discoverer. 



Genus ? Mesalia, Gray. 

 ? Mesalia tenuisculpta, Cpr. n. s. State Collection, No. 666 a. 



?M. t. tenui, regulariter turrita, fusco-cinerea ; anfr. nucl. Icevibus, normali- 

 bus, apice acuto ; norm. viii. rotundatis, suturis impressis ; lirulis spiralibus ; 

 baud extantibus, plus minusve distantibus, irregularibus cincta, quarum anfr. 

 primis dua3 anticae majores ; lirulis circa basim rotundatam obtusis, subregular- 

 ibus ; rugulis incrementi irregularibus, interdum decussantibus ; apertura sub- 

 rotundata, peritremati baud continua ; labro acuto, postice flexuoso ; labio tenui. 



Long. 0-28, long. spir. 048, lat. 0-10, div. 15°. 



Hab. S. Diego; 4-6 fms. 15, alive. Cooper. 



Intermediate in character between Mesalia and Fenella. 



