143 



2045 Ashmunella Thompsoniana Pecosensis 



Cockerell, Nautilus 16:105. Valle ranch, Pecos, N. M. (fossil). 



2046 Pyramidula strigosa eoncentrata 



Cockerell, Nautilus 16:106. Alpine, Chaffee Co., Colo. 



2047 Tritonia Palnieri Cooper 



Cockerell, Nautilus 16:117. Note. San Pedro, Cal. 

 Type locality: — San Diego, Cal. 



2048 Stearns, Robert E. C. 



Mollusks occurring in Southern California. Nautilus 16:133. 



2049 Elrod, Morton J. 



Montana shells — Pyramidula strigosa. Nautilus 17:1-6. 

 Describes var. alpina as new, and other forms. 



2050 Cooper, James G. 



A list of the writings on conchology and palaeontology of the 

 author, compiled by W. J. Ramond, appears in the Nautilus 17: 

 6-12. 



2051 Olivella (anazora Duel, var.?) Porteri 



"Shell of about the form and size of the east American O: 

 jaspidea, with very variable coloration; whorls about 7, spire 

 acute with a very deep and narrow channeled suture not obscured 

 by callus; surface of whorls brilliantly polished, smooth, except 

 for microscopic spiral close striation which is present on all, but 

 more uniform on particular individuals; color pale olive, yellow, 

 or whitish, with sharp angular axial brown lines superposed be- 

 tween the suture and the basal fasciole, sometimes forming a tent- 

 like pattern and sometimes reduced to fine, close, more or less 

 cloudy zigzags; a pale band in front of the suture, usually with 

 vivid brown zigzag pointed forward, but sometimes plain, the 

 brown lines when present broader and stronger than elsewhere; 

 basal fasciole short, with a marginal and an adjacent narrow fold 

 or plait anteriorly, lighter than the body, yellow or rich bluish 

 purple; aperture narrow, simple, with a deep sutural sinus and a 

 moderate parietal callus when mature. Height of shell 15, of 

 aperture 9, max. diam. 6 mm." — Dall, Nautilus 23:133. 



San Diego, Cal., on sandbars near entrance to harbor (Miss J. 

 M. Cooke). Scammon Lagoon, Lower California. Named in 

 honor of Capt. George Porter, who collected largely in the Gulf of 

 California, and is supposed to have lost his life at Tiburon Island. 



2052 Ponuuilax turbanicus Dall, Nautilus 23:134. 

 Magdaiena bay, Lower Cal., in 3 6 fms. 



2053 Pachypoma magdaiena 

 Dall, 1. c. 135, samo locality. 



2054 Pachypoma lithophorum 



Dall, 1. c. Cerros Island, Baja Cal., in 58 fms. 



2055 Leptogyra alaskana 



Bartsch, Nautilus 23:136, t 11 f 46. Port Graham, Alaska 

 (Fred Baker). 

 2050 Alvania TJakeii 



Bartch, 1. c. 137 t 11 f 8. Port Graham, Alaska (Fred Baker) 



2057 Onoba asser 



Bartsch, 1. c. 138, t 11 f 9. Same locality and collector. 



2058 Odostomia (Evelea) Cookeana 



Bartsch, 1. c. Ellamar, Alaska (Fred Baker). 

 Named in honor of Miss J. M. Cooke, of San Diego, Cal 



2059 Lymnaea bulimoides techella Hald. 



