ACADEMY OF NATURAL SCIENCES. 21 



P. runcinatus Kellogg. [Fig. 4.] 



Acaulescent, several naked scapes, two to four inches high, sub-glabrous, 

 (rarely a few scattering glandular hairs) ; leaves radical, runcinately piunatifid. 

 lobes spinulose, frosty, or sub-wooly, pubescent, three to seven-nerved, short 

 petioles winged, dilated at the base ; rosulate, from a simple perennial somewhat 

 fusiform root. 



Professor Whitney exhibited a new mass of meteoric iron, found 

 near La Paz, on the Colorado River, in New Mexico, by Hermann 

 Ehrenberg, Esq. A description and analysis will be furnished at a 

 future meeting. 



Regular Meeting, April 20th, 1863. 

 Vice President, Dr. Trask, in the Chair. 



Present, seven members. 



Philip Lutley Sclater, Esq., of London, England, was elected a 

 Corresponding Member. 



Donations to the Cabinet : 



Three species of Reptiles front San Mateo, and one from Marin 

 County, collected and presented by Mr. Bolander. 



Dr. Cooper communicated the following description of a new 

 California!! Mollusc, discovered by Rev. Joseph Rowell, at Marys- 

 ville, in the waters of Feather River. 



Gundlachia Pfeiffer. 

 G. Californica Rowell. [Fig. 5.] 



Shell with the aperture sub-oval, obliquely expanded towards the 

 left, posteriorly rouaded, and wider anteriorly. Internal shelf reach- 

 ing forward about one-fifth the length of the shell, its margin slightly 

 concave and oblique. 



Dorsal surface convex, becoming somewhat keel-shaped towards 

 the apex, which is strongly and obliquely deflected so as to make the 

 right border nearly a straight line, while the expansion on the left 

 projects nearly as far back as the apex, as an obtuse angle. Struc- 

 ture corneous, with strong concentric lines of growth, and faint radi- 

 ating strire. Color dark brown, opaque ; inner surface shining and 

 purplish, the plate white towards the edge, and in some specimens 

 showing a thickened, white semicircle continuous with its margin 

 across the arch of the shell. 



Length about sixteen one-hundredths, breadth eight one-hundred ths, 



Fig. 5. 



f 



and height six one-huudredtbs of an English inch. 



