270 ‘Scientific Intelligence. 
be regarded as the most characteristic fossil of its era. As the boulder 
from which these shells were derived was quite small, and yet furnished 
thirteen species, when it shall be investigated in situ, doubtless a great 
many other forms will be obtained, and very likely some with which we 
are already familiar in eastern localities. Although the rock is a very 
hard sandstone, the shells may be exposed in great perfection by care- 
ful management, and we look forward with great interest to their further 
development, and to the discovery of the rock in situ 
List of Species.—[Species not new are marked with an asterisk ; all 
are Conrad’s except Natica gibbosa and Anodonta Californiensis of Lea, 
Cardita planicosta, and Fissurella crenulata of Sowerby. ] 
(1.) Eocrene.—Cardium linteum, Dosinia alta, Meretrix Uvasana, M. 
Californiana, Crassatella Uvasana, C. alta, Mytilus humerus, Cardita 
planicosta,* Natica cetites, N. gibbosa,* Turritella Uvasana, Volutatithes 
Calforniana, Busycon ? Blakei, Clavatula Californica 
2.) MiocENE AND RECENT FORMATIONS. ee ‘modestum, Nucula 
decisa, Corbula Diegoana, San.Diego; Meretrix uniomeris, Montere 
county ; M. decisa, Ocoya creek; M. Tularana, Talave valley ; Tellina 
Modiola contracta, rare county ; Mytilus Pedroanus, San Pe TO ; 
Pecten Deserti, Anomia subcostata, Ostrea vespertina, O. Heermanni, 
Colorado desert ; Penitella speleum, San Pedro, (recent) ; Fissurella 
crenulata,* San "Pedro; Crepidula Ae Santa ott lh Natica 
iegoana, Trochita Diegoana, San Diego; Crucibulu um spinosu ners 
Nassa i imieratriaia, N. Pedroana, Siiniohea Pedroana, Littorina Pedroana, 
San Pedro ; Stramonita petrosa, Tulare valley ; Gratelupia mactropsis, 
Meretrix Dariena, Tellina Dariena, Isthmus of Darien ; soi paar 
N. geniculata, Bulla jugularis, Pleurotoma transmonta P. Ocoy 
Scytopus Ocoyanus, Turritella Ocoyana, Colus eigtins Pellna Geo 
ana, Pecten Rave ae P. catilliformis, Cardium ——? Arca ——: 
| ? Dosinia ——? Venus ? Cytherea decisa? Ocoya 
or Posé creek ; Oates ? Pecten ? ncn biseriata, San 
Fernando ; Tro chus ? Turritella Pt nicia; Buccinum 
interstriatum ? Olivia Pedroensis, San Pedro; Piers "Californien- 
sis,* Colorado desert. 
Remarks in conclusion, by W. P. Blake.—From this report by Mr. 
Conrad, we ase eh that in the plteeien of sixty-one determinable species, 
fifty-five a and are now described for the first time. Of these; 
ten are ieden one nahh rre at the southern extremity of the Tulare valley, 
at the entrance to the pass called the Cafiada de las Uvas. are 
of sniniil sandstone that hid been washed out of the ravine of 
pass by floods e rock was not found in situ at that point, but a few 
# a similar rock occurs in place, and is replete e with 
re believed to be the first fossils of the 
en patented tebe the Pacific slope of the United States. 
