208 PROCEEDINGS OF THE NATIONAL MUSEUM. 



A single example in the collection of my friend, Mr. Tlomer Hamlin, 

 of LoH Angeles, enables me to describe this form, which was collected 

 by me some years ago (in the fall of 1887) in the same locality. The 

 fossil specimens collected by me dniing my association with the (Jnited 

 States Geological Survey are in the United States National Museum 

 (Reg. No. 148271). 



A fine, large fresh specimen, bearing no indications of fossilization, 

 is in tlie collection of the United States National Museum (No. I.'>0.'i20), 

 and was collected on the beach of San Diego Bay, the precise spot not 

 being recorded. It is in size about midway between the two fossil 

 specimens above cited, and in color is of dee]) rosy flesh color, much 

 darker than in the fossils, with a lighter band midway on the whorl. 

 Except in its characters as a living shell it does not differ in any 

 essential respect from the Post Pliocene specimens above mentioned. 

 Actaeon traslcii is apparently of rare occurrence, though Mr. Hamlin 

 has collected it before at the same locality. I failed to 

 obtain it in the San Pedro bluffs of the same age and 

 character, namely, nearly loose sand. It is associated 

 in the Spanish iiight bluffs, which are situated on the 

 Coronado Peninsula opposite the city of San Diego, 

 with the comparatively common allied species Act<ieon 

 (liictaxu) piinctocaelatiis Car])enter, of which numer- 

 ous exami)les were collected by me at the same time. 

 Tlie latter is a less robust and more delicate form; it 

 is found living at many points along the coast from 

 Monterey soutlierly. Beach specimens were found by 

 me on the shores of Monterey Jiay in March, 18G7. It 

 ^'^^stearns^^'^" sometimes occurs in considerable numbers at Long 

 Beacli and San Pedro. 

 This new Actaeon I have named for Dr. John B. Trask, one of the 

 founders of the California Academy of Sciences, also a pioneer in 

 natural history investigations on the west coast, as well as a skillful 

 y)hysician. 



The two species mentioned above must be added to the catalogue of 

 Californian fossils. In Dr. J. G. Cooper's list, published in the Seventh 

 Annual lieport of the State Mineralogist of California, he includes 

 Opalia anomala and 0. varicostata, referring them to the Quaternary and 

 to the San Diego well. Neither of the species were detected in the 

 well material, and both are Tertiary (Pliocene) forms, occurring in the 

 older bluffs of Pacific beach, where I obtained numerous examples in 

 the fall of 1887, and a single individual of a related form, >Scala stearmii 

 Dall — a solid, chunky shell, nearly as broad as long (about an inch), 

 described and figured by the author' — another addition to Ihe Cali- 

 fornia list. 



' Triinsactious of the Wagner Free Institute of Philadelphia, 1892, III, Ft. 2, p. 245, 

 pi. XXI, lig. 4. 



