36 



are Ostrea, and an Echinoderm, a Cidarisoi 

 tangos, I think the latter ; these last are the 

 characteristic of this layer, for i haw 

 the Echinoderm in the lower beds— the speci- 

 mens vary inside from U inch to \% inches 

 across, and are variously mai bed upon the sur- 

 face. I have ascertained fou 

 them, some of these specimens especially those 

 from Rio Estrello, perhaps belong to the radiate 

 family, in the upper layers of this, Pecten 

 occurs, with an oca ardium and Terebra- 



tula and a bivalve mollusc, eit a" or 



"Unio" — Astarte modiolus, and Belemnite. 



The 4th bed is a soft brown sand 

 possesses some layers hardened and parforal 

 molluscs. 



Such are the j they exist in San Luis 



Obispo Co., and Santa Margarita, 'i 

 point north (the 1st poinl i where i observed them 

 was on the San Antonio, near its head and the 

 farthest point 1 have observed it. is the the south 

 limit of the county, as I have not followed it 

 into Santa Barbara, Its western limit is the 

 littoral range of the C< ins. [give 



this term to the mosl westi rly of the i 'any chains 

 which receive the name of < 'oast Range : towards 

 the east it is found pass Tulare County, 



and extending to the foot of thai chain which is 

 known as msion of the Sabilan or Mi. 



Diabolo range. In this course it is not continu- 

 ous, but is and uplifted by the chains and 

 ate hills which oc sur in ast, and in 

 some places d, such 

 occurs in the Panza hills along the Estrella 

 River from which the besl specime 

 ed. The hills from which tl Maria de- 

 rives its supplies of water, expose these bi 

 their fool 



Independent of the character of the fi 

 there are two points of interest connected with 

 these b 



1st. They lie conformably upon the granite 

 upheaved, which I the Salinas river — 



they i re older than the granite. 



2nd. Tii the littoral range; all the 



beds on the wi this lath r eh:, in are 



recent than those on the east They wei 

 uplifted at thai and the d< nth probably 



greater than could sustain those animals. 



I am inclined to look nponl Early Eo- 



cene shells. They closely resemble i 

 fossils and had I found / u among them. 



I should nol ! tated. I' i osy to 



compare American speci ns with European, as 



I ila, the 



Od, and tic of 2,200 feel : 



are all of marine origin, and nowhere have 

 any trace of land pla mal. This 



tiary bed, 

 larger than I am acquainted with elsewhere; 



but it is no insurmountable objection to its ad- 

 mission into that seri -. 



Mabch 19, 1855. 



Dr. II. I ribbons in the chair. 



Dr. Kellogg presented specimens of the fruit 

 of Torrcya Califoryiica, the California Nutmeg 

 Tree. 



Dr. Kellogg exhibited a drawing and speci- 

 with seeds of a species of Cydobothra, a 

 plant of the Tulip family. 



This species is known by the common name of 

 Alabaster Tulip, on account of its pure white 

 color ; it is found several feet in height with 

 branches at the axils of the leaves, and numerous 

 nodding bell-shaped flowers scarcely expanded. 

 Several months since, two other smaller species 

 were figured ; one with golden flowers, known as 

 the Golden Star Tulip, and another with blue or 

 ted Bowers called Blue or Striated Star 

 Tulip. 



We have no means of reference to the de- 

 scriptions of such species as arc known, and must 

 therefore be content to lay before the Academy 

 only our personal observations. It is to be hoped 

 our friends of Placerville and elsewhere will fur- 

 nish specimens for illustration and ezchang 



Dr. W. P. Gibbons presented the following 

 description of a new Trout. 



Salt Gibbons. — Body elongated, sub- 



compressed ; head a 1 urthof total length. 



. circular, horizontal diameter nearly 

 one third the length of the head. Facial outline 

 elliptically rounded. Vertical line from the poste- 

 rior extremity of the upper maxillary, will graze 

 the posterior edge of iris. Teeth minute, numer- 

 ous, regular, incurved. A series of from 3 to 5 

 incurved teeth in each margin of the tongue. — 



Those on th Iges of the palatines and on the 



vomer, numerous. 



■th of body to its greatest depth, 9 to 2. — 

 First dorsal rises from a point midway between 

 rtremity of the snout and the end of the 

 lateral line. The adipose and anal terminate on- 

 to each other. Ventrals under the first 

 fourth or half of the first dorsal. Caudal fork- 

 ed. First dorsal with five irregular, interrupted 

 black horizontal bands. Other fins black punc- 

 tate, ventrals tipped with orange, caudal and ad- 

 itfa black margin. 



maU< Back cineritious, with lighl 

 purple tint. Sides along the lateral line light 

 vermilion, interrupted by rounded dark patches, 

 which become nearly or quite obsolete in older 

 specimens. Sides and Welly below these, silver 

 tinted, finely black punctate! 



