18 CALIFORNIA ACADEMY OF SCIENCES. 



lip to the shell, as well as thinner and plainer shells, though 

 these characters differ] from those derived from internal 

 organs. In our native species, however, they serve very 

 well to separate the two groups. 



Mesomphix (vancouverensis?) simplicilabris Ancey, (No. 13.) 



Mr. Binney, in 2d Supp., p. 41, calls this a variety of 31. 

 voyona, but unless confounded with immature shells of that 

 form, it seems as nearly connected with the above, the shell 

 as found near this bay having the smooth polished surface 

 and undeflected lip of the young of the larger forms, with 

 the small size and wider umbilicus of the small var. of.Jf. 

 voyana. That it is not a hybrid is shown by its not being 

 found with either of the others, and it is very rare any- 

 where, appearing to be either a survival of an ancestral 

 form, or a proof that M. voyana is a derivation from the 

 larger forms. Mr. Binney writes about specimens I sent 

 him: 



"The lingual is like that of M. vancouverensis.'''' He also 

 remarks on the similarity of the shell to his new form, " M. 

 hempMlli,'" from Washington Territory; but that is much 

 larger, and with a contracted umbilicus. As M. voyana 

 also intergrades with M. sportella, it seems as if all these 

 forms must yet be considered as only subspecies, like those 

 of some other west slope species. 



Microphysa conspecta Bland. (No. 2i.) 



The unexpected appearance of these little delicate species 

 in cultivated grounds is shown by the finding of this shell 

 for the first time east of San Francisco Bay in 1886, at Hay- 

 wards. A hanging basket, planted with ferns and covered 

 with mossy bark brought from a canon near by, was hung 

 in my garden, and some months later I looked under 

 the bark to see if any molluscans had remained in it. I 

 found the above species abundant, and in a few weeks took 

 out over one hundred, always finding more, still immature. 

 After being unwatered for four months, and becoming quite 

 dry, they revived on being moistened. 



