104 



Dedicated to Dr. W, 0. Ayres, Cor. Sec. of Cal. Acad. Nat. 

 Sciences. 



• Remarhs. — The surface of this beautiful shell is cut up by 

 the strige into reticulations, which su,o-gested that the Helix 

 reticulata Pfr. was before me. This last named is a California 

 species, which 1 have not yet seen. The description of that 

 shell proves them quite distinct, H. reticulata having only five 

 and one-half whorls and the umbilicus being impervious. 



Physa eostata. — P. testa ovato-globosa, cornea vel rufo-cor- 

 nea ; anfr. 4, ultimus inflatus et supra obtuso-ang.ulatus cum 

 costis 10 ad 14 prominentibus munitus ; apex aciitus ; spira 

 brevis ; apertura ovata. 



Long. 9 mill. 



Hab. " Clear Lake, California," Lat. 6 " 



Shell ovate globular, horn colored or reddish corneous ; 

 whorls four, the last inflated and roundly angulated above, 

 armed with ten to fourteen prominent longitudinal ribs ; apex 

 acute ; spire short ; aperture ovate. 



Museum Cal. Acad. Nat. Sci. 



My cabinet. 



For this curious species of Physa we are indebted to Dr. 

 Veatch, who collected several specimens at Clear Lake, most 

 of them, however, immature. This is the only species provided 

 with regularly arranged costae that I have seen, and this char- 

 acter alone will be sufficient to separate it from all other de- 

 scribed species of the genus. 



April 1, 1861. 

 President in the Chair. 

 Dr. Kellogg read a description of a new species of Chlorog- 

 alum, (Soap Plant) brought from Shasta by Mr. Andrew A. 

 Yeatch, and cultivated by Mr. H. G. Bloomer. 



C hlorogalum angustifolium (KeWogg). Fig. 30. Bulb short- 

 ovoid with a conic apex slightly ribbed below. OutergCovering 

 a smooth thin brownish membranaceous coat, closely attached. 



The paniculate-scape slender, erect, branching, smooth, light 

 green, two to three feet in height ; flowers small, abundant, 

 approximated on attenuated racemose branches ; white, with a 

 light yellowish green line (or three parallel lines under the 

 glass) along the back of the petals ; pedicels short (one to 

 three lines long) and with the subulate bracts incurved. 



