by L. F. Spath. 45 



P. pappillata has similar ornament, and it has been mentioned that 

 the smaller example of this form in the present collection has a 

 slightly notched keel, so that derivation of Pseudoschloenbachia from 

 the form here described is suggested, especially since the median row 

 of tubercles is very hi^h and acute in this new form, and may well be 

 assumed to lead to the strong carina of Pseudoschloenbachia and 

 Diaziceras, which also has similar ornamentation, but a reduced 

 suture-line. Spheniscoceras and Eidophoceras are further developments 

 of the same stock. An unnamed Egyptian species of Pseudoschloen- 

 bachia, somewhat intermediate between P. papillata and P. umbulazi 

 in ornamentation, and with the carina feebly notched, equally forms 

 a connecting link between the new genus here indicated and 

 Pseudoschloenbachia. 



" Schloenbachia " chicoensis, Trask sp. 1 may belong to the new genus, 

 and " Schloenbachia' 1 '' buttensis, Anderson 2 also from the Upper Chico 

 formation, probably indicates a second, unnamed, development, to 

 which ' S.' blanfordiana, Stoliczka, 3 seems allied. The Lower Chico 

 Barroisicerast siskiyouensis, Anderson, sp. 4 , however, and its near 

 ally, B.? dentato-carinatum, Roemer sp. 5 also greatly resemble the 

 new form, and in the absence of the suture line, no new generic name 

 is given, especially since the Campanian age of this new group may 

 not be considered to be sufficiently firmly established. 



Genus SCHLUTERIA, Grossouvre, em. 



7. — Schluteria woodsi, nov. Plate VII, fig. 1. 



This species is represented by the figured specimen (dimensions 

 85--56--40--07) and an immature example (diameter =17 mm.), and 

 differs from S. larteti, Seunes sp. (Grossouvre) and from S. diphylloides, 

 Forbes sp. 7 in being more inflated and in having the constrictions 



1 Proc. Calif. Acad. Sci. Vol. I, 1856, p. 92, pi. ii : emend. Anderson, " Cret. 

 Depos. Pacific Coast/' ib. 3rd. ser. Vol. ii, Geol. (1902), p. 116. 



2 loc. cit. (1902), p. 118, pi, iv, figs. 110-11. 



3 "Cret. Ceph. S. India,,' Pal. Indica. Vol. I, 1863, p. 46, pi. xxvi. 



4 loc. cit. (1902), p. 119, pi. i, figs. 19-20. 



5 "Kreidebild. v. Texas," 1852, p. 33, pi. i, figs. 2. 



6 loc. cit. (1894). p. 218, pi. xxxiv, figs. 2 & 3. 



7 "Keport on Foss. Invertebr. fr. S. India, etc.", Trans. Geol. Soc. 2nd ser. 

 Vol. vii (1845), p, 105, pi. viii, fig. 8 (B.M. 10470, Geol. Soc, Coll.). 



