168 



2429 Pleurotoma (Genota) Tryoniana Gabb. Tertiary to recent. 



2430 Pleurotoma (Genota) Cooperi Arnold. Quaternary. 



2431 Lowe, H. N.: 



A dredging trip to Santa Catalina Island, Nautilus 18:18. 

 Records the following, numbers 2432-2478, among others. 



2432 Actseon Painei 



Dall, Wash biol soc pr, 1903. Avalon, Cal. 



2433 Admete gracilior Cpr. 



2434 Angulus Carpenteri Dall. 



Synonymy: — Angulus variegatus Cpr. (not Gmel.). 



2435 Cadulus fusiformis P. & S. 



2436 Cavolina Pacifica Dall. 



2437 Clathurella Lowei 



Dall, Wash biol soc pr, 1903. Avalon, Cal. 



2438 Crenella Columbiana Dall. 



2439 Chama muricata Hinds. 



2440 Cuspidaria obesa Lov. 



2441 Dentalium neohexagonum S. & P. 



Shell thin, white, curved, 6-sided, about 2 inches long — the 

 common sp. of southern Cal. 



2442 Ischnochiton biarcuatus 

 Dall, Wash biol soc pr, 1903. 



2443 Ischnochiton punctulatissimus Cpr. 



2444 Lucina annulata Rve. 



2445 Lucina approximata Dall. 



2446 Lepidopleurus crebriscostatus Cpr. 



2447 Lepidopleurus Mertensi Midd. 



2448 Leptochiton nexus Cpr. 



2449 Lunatia Draconis 



Drake's bay, Monterey, and Farallones Islands, Cal. 



Dall, Wash biol soc pr, 1903. Named for Sir Francis Drake. 



2450 Macromphalina Californica 

 Dall, 1. c. — off Avalon, Cal. 



2451 Mangilia densistriosa Cpr. 



2452 Mangilia Fancherae 

 Dall, Wash biol soc pr, 1903. 



2453 Metzgeria Californica 



"Shell small, translucent white, with a pale straw-colored, 

 dull, wrinkled and rather conspicuous periostracum; nucleus small, 

 smooth, white, obliquely inclined, of nearly 2 whorls; there are 

 4 or 5 rounded subsequent whorls separated by a deep, not chan- 

 nelled suture; sculpture of about 9 rather prominent, rounded 

 axial ribs extending from suture to suture and on the last whorl 

 to the base, separated by wider interspaces and crossed by numer- 

 ous subequal spiral threads, covering the whole shell, their wider 

 interspaces striated by the incremental lines. Aperture about 

 half as long as the shell, the outer lip sharp, the throat smooth and 

 white; the pillar white, not callous, with 3 distinct, oblique plaits 

 beside the slightly raised margin of the canal, these are only visi- 

 ble from the side of the aperture; anteriorly the pillar is tortu- 

 ous, slightly recurved, open and rather wide. Length of shell 14, 

 of aperture 7; width of shell 6 mm." — Dall, Nautilus 17:52. 



Type locality: — Santa Barbara channel, Cal. (J. H. Paine). 



2454 Mitra Lowei 



Dall, Wash biol soc pr, 1903. 



2455 Modiola polita Verrill. 



