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University of California Publications in Geology [Vol. 9 



TROCHOCYATHUS PERGRANULATUS, n. sp. 



Plate 3, figures 16, 17 



Type from locality 484, SE % of SW V4 sec. 9, T. 1 S, R. 1 E, M. D. B. & M., 

 in University of California Department of Palaeontology collections. 



Corallum apparently conical. Transverse section elliptical. Costae 

 forty-eight, granular, rounded, of not very prominent development. 

 Between the costae are an equal number of rows of small granules 

 which do not appear to have corresponding septa. The forty-eight 

 septa are arranged in four complete cycles of six systems. Septal 

 faces granulated. Pali bilobate, granular, before the first three cycles 

 of septa. Columella almost rudimentary, consisting of only very few 

 trabiculae. Greater transverse diameter, 6.7 mm. ; lesser transverse 

 diameter, 5.4 mm. ; height of corallum perhaps about 14 mm. 



Occurrence at University of California locality 484 in the Chico, 

 Cretaceous, on the south side of Mount Diablo, Contra Costa County, 

 California. 



MADRIPORA SOLIDA, n. sp. 



Plate 5, figures 1, 2 



Type in University of California Department of Palaeontology collections 

 from locality 738. 



Corallum seeming to branch irregularly. Cross-section of corallites 

 elliptical. Costae distinct, broad, slightly granulate, corresponding in 

 number to the septa. Septa thick, variable in number, lateral faces 

 apparently smooth, the inner edges of the first and second cycles may 

 be fused to others in an asymmetrical arrangement. Columella 

 absent. In the type specimen the corallites vary considerably in size. 

 The cross-section of the smallest but most perfect corallites shown in 

 the figure had the following dimensions : greater diameter, 8 mm. ; 

 lesser diameter, 6.5 mm. 



Occurrence near the base of the Carrizo formation, Pliocene, from 

 University of California locality 738 on the south side of Coyote 

 Mountain, San Diego County, California. 



Three other species of corals from this locality have been named 

 in manuscript by T. W. Vaughan and listed by Ralph Arnold in United 

 States Geological Survey Professional Paper 47. Material in the 

 University of California collections generically the same as given in 

 unpublished manuscript by Vaughan from the same locality is there- 

 fore not described in the present paper. 



