52 THE NAUTILUS. 



Callistochiton palmulatus Carpenter. 22 fathoms. Two speci- 

 mens. 



Callistochiton palmulatus var. mirabilis Pilsbry. Low tide ; not 

 rare. 



Callistochiton crassicostatus Pillsbry. Low tide ; not rare. 



Nuttallina californica Nuttall. Exceedingly common between 

 tides on the rocks. 



Mopalia muscosa Gould. Low tide to 12 fathoms. Very. common. 



Mopalia hindsii Sowerby. Low tide ; not rare. No specimens 

 showing any intergradation between this species and the preceding 

 or the next were observed. 



Mopalia lignosa Gould. Between tides ; common. 



Mopalia ciliata Sowerby. 12 fathoms; four specimens. All the 

 specimens taken were predominantly red in color, but sometimes 

 mottled with white, brown and green. A very striking and hand- 

 some species. 



Mopalia ciliata var. wossnesenskii Middendorf. 1 2 fathoms ; one 

 specimen. 



Placiphorella velata Carpenter. A number of specimens of this 

 interesting species were found at low tide. 



Katherina tunicata Sowerby. Several specimens were obtained 

 far out on the rocks among the mussels. 



Cryptochiton stelleri Middendorf. A few specimens found at low 

 tide. 



In conclusion it may be well to call attention to several interest- 

 ing features of Monterey's mollusk fauna which are presented by the 

 foregoing list: the extraordinary development of the chitons (some 

 twenty-six species and four varieties); the large representation of 

 Ocinebra (ten species and varieties), of Scala (eight species), and of 

 the Pyramidellidae (fourteen species); and the prominence of 

 Acmaeidae in the shore fauna, both as regards number of species and 

 varieties (fifteen) and of individuals. 



TWO NEW SPECIE8 OF LYMN.EA. 



BT FRANK COLLINS BAKER. 



Ltmn^a jacksonensis n. sp. 



Limnea catascopium Binney (part), Land and Fresh-water Shells 

 of North America, II, 1865, p. 56, fig. 86, two central figures. 



