2887 Lepidopleurus rugatus Cpr. 



2888 Lepidopleurus nexus Cpr. 



2889 Ischnochiton regularis Cpr. 



2890 Ischnochiton mertensii Midd. 



2891 Ischnochiton sinudentatus Cpr. 

 Perhaps a var. of I: decipiens? 



2892 Ischnochiton magdalenensis Hinds. 



2893 Nuttallina Californica Reeve. 



2894 Mopalia muscosa Gould. 



2895 Variety Lignosa Gould. 



2896 Variety Hindsii Reeve. 



Nos. 2887-2896 are recorded from Pacific Grove, Cal., by Pils- 

 bry, 1. c, 288. Several 7-valved specimens of Chitons are recorded. 



2897 Genus Vallonia Risso, 1826. 



Sterki, Phila acad pr 1893:234, gives an exhaustive study of 

 this group of minute snails, which we will not attempt to review. 

 The study of the soft parts seem to sustain the genus, while 25 

 species and var. are described. Ten or more are recorded in our 

 region. 



2898 Genus Tethys Linne. 



Pilsbry, Phila acad pr 1895:346, shows that this name ante- 

 dates Aplysia and Laplysia Linn. 



o 



2899 Pilsbry, H. A. and E. G. Vanatta: 



Revision of the N. A. slugs: Ariolimax and Aphallarion. Phila 

 acad pr 1896:339. Describes Aphallarion as a new genus. 



2900 Genus Aphallarion Pilsbry and Vanatta. 



"External characters, jaw, radula and digestive tract, shell 

 and general internal topography, as well as female genitalia, as 

 in Ariolimax; penis (and its retractor) completely wanting, a 

 small and short epiphallus lying in its place; right eye retractor 

 passing to the left of genitalia." 



Type: — -A. Buttoni. 



2901 Pilsbry and Vanatta: 



Anatomical notes on certain West American Helices. P. & V. 

 1. c. 1898:67. 



Synopsis of the recent and tertiary Psammobiidse of N. A. 

 Phila acad pr 1898:57. Mentions the following species of West 

 America. 



2903 Psammobia maxinius Deshayes. 

 Gulf of California to Panama. 



2904 Psammobia regularis Cpr. 

 Gulf of California. 



2905 Psammobia Californicus Conrad. 1848. 

 Sitka to San Diego, Cal.— Japan. 

 Synonymy: — P. rubroradiata Cpr. 1863. 



2906 Psammobia fucatus Hinds. 

 Magdalena bay, Baja California. 



2907 Psammobia edentulus Gabb. 

 San Pedro, Cal., in 60 fms. 



The above all belong to the subgenus Gobra^us of Leach. 



2908 Sanguinolaria tellinoides A. Ad. 



Gulf of Cal. to Panama. 



