328 [April, 



inner webs with greenish yellow. Entire under parts light yellow, tinged with 

 olive green on the breast and sides, throat slightly mixed with white, and the 

 shafts of some of the feathers on the neck before white. Tail above dark olive, 

 beneath greenish yellow. Bill and feet light colored. 



Hab. Moonda river, Western Africa. Discovered by M. P. B. Du Chaillu. 



Obs. Apparently a Criniger, Temminck, and almost exactly resembles in color 

 Criniger ictericus, Strickland, of India, but is smaller, and otherwise different. 

 The only specimens that I have ever seen are in the present collection. 



13. Tricophorus leuccrus, nobis. 



Form. Bill wide at base, wing with the first quill subspurious, fifth quill 

 longest, tail moderate, with the feathers broad, tarsus and toes rather short. 

 Feathers of the rump lengthened and soft. 



Dimensions. Total length (of skin), sex unknown, 7 inches, wing 4, tail 3 

 inches. 



Colors. Four middle feathers of the tail brownish black, other tail feathers, 

 (four on each side) white, tinged with yellow on their outer webs and tipped 

 with brown. Entire upper parts yellowish olive, darker on the head. Quills 

 dark brown, edged with yellowish green on their outer webs and with pale 

 ashy white on their inner webs. Entire under parts dark cinereous tinged with 

 yellowish green, under coverts of the tail yellowish white. Bill and feet dark. 



Bab. St. Paul's river. Discovered by Robert MacDowall, M.D. 



Obs. This is another bird which I have found some difficulty in assigning to 

 a genus. It can easily be recognised by its white tail feathers, as described 

 above. 



14. Phyllostrophus leucopleurus, nobis. 



Form. Bill moderate first quill short, fourth slightly longest, tail rather long, 

 tarsi and feet rather long, feathers of the head above somewhat scale-like. 



Dimensions. Total length (of skin) sex unknown, 9} inches, wing 4J, tail 4|- 

 inches. 



Colors. Entire upper parts brown, with a slight tinge of yellowish on the 

 back and of ashy on the head. Quills brownish black edged with brown on 

 their outer webs and with ashy white on their inner webs. Throat and breast 

 ashy white tinged with brownish green on the breast, where many of the 

 feathers have central stripes of ashy white. Sides (under the wing) with a 

 large white space, abdomen and under coverts of the tail white, with a very 

 pale tinge of yellow. Tail brown, four outer feathers (on each side) widely 

 tipped with white. Bill and feet dark. 



Ilab. Moonda river, Western Africa. Discovered by M. P. B. Du Chaillu. 



Obs. One specimen only of this fine species is in the collection. It is 

 strongly characterised by the large white spaces on the sides, which are readily 

 observed on raising the wing. This bird may be related to Phyllastrephus capen- 

 .sis or P. senegalensis, of both of which indifferent figures and descriptions have 

 been given, but of which I have not seen specimens. 



Notice of Remarkable Strata containing the remains of Infusoria and Polytha- 

 lamia in the Tertiary Formation of Monterey , California * 



By William P. Blake, 



Geologist of the United States Pacific Railroad Survey in California. 



When in San Francisco, in June, 1854, 1 received a fragment of a white, porous 

 earth, resembling chalk ; but which, from its lightness and general characters, 



*This notice has been deferred in consequence of the expectation of receiving 

 from California a full suite of specimens collected at the locality, which 

 should have arrived by this time. The principal facts concerning the position 

 and geology of the deposits are now presented, and will be followed by more 

 important details regarding the chemical composition and organisms of the speci- 

 mens after they have been received. 



