536 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



Monoceros engonatum Conr. 



Abundant on exposed shingle beaches. 



Monoceros pauciliratum Stearns. 



Exposed shingle beaches. Also at Todos Santos Bay. 



[This species forms the link between the two preceding species. D.] 

 Monoceros engonatum var. spiratum Blainv. 



More common on sheltered rocky beaches. 

 Chorus belcheri Hds. 



Formerly abundant at San Diego (during the early whale fisheries), 

 ■where it is now rare. Common at Todos Santos Bay. 

 Ranella californica Hds. 



Very abundant in January, when it comes into sheltered places for 

 breeding. Its favorite ground is on the sandy beach inside of the False 

 Bay peninsula, where it finds abundant food, preying on Ecliinarach- 

 nius excentricus, Renilla amethystina, etc. The dead shells of this, 

 Chorus Belcheri and Siphonalia Kellettii are washed up in great num- 

 bers at Todos Santos Bay. 

 Fusus kobelti Dall, var. unicolor. 



One specimen. San Diego. 



[It differs from the type in being more slender and in the absence of 

 the usual chocolate color on the larger riblets. D.] 

 Siphonalia kellettii Fbs. 



Very rare at San Diego, apparently abundant at Todos Santos Bay, 

 where large numbers of dead shells are washed ashore. 



[Dredged alive in 16 fathoms off Oatalina Island Harbor in 1873. D.] 

 Macron lividus A. Ad. 



Not rare near low water; ocean beaches. Also Todos Santos Bay. 



Nassa fossata Gould. 



Dead shells of this and the following abundant, apparently common 

 in deep water. 

 Nassa perpinguis, Hinds. 



San Diego. Also at Todos Santos Bay. 

 [Not rare at Catalina in 16 fathoms. D.] 



Nassa mendica var. cooperiFbs. 



Eare at low water at La Playa, also at Todos Santos Bay. 



Nassa tegula Eve. 



Abundant on muddy bay shores. 

 Mitra maura Swains. 



Dead shells often washed ashore on the ocean beaches. 



Erato vitellina Hds. 



Not common. 

 Erato columbella Mke. 



False Bay and La Playa. Eare. 

 Marginella regularis Cpr. 



San Diesfo. Not rare. 



