DESCRIPTIONS OF SPECIES. 101 



Types. — Johns Hopkins University. 



Specimens. — United Sttitcs National Museum. 



The specimens on which this species is founded are all imperfect. I 

 could not obtain accurate details concerning the characters of the columella 

 or of the pali, but the species seems to present all the essential characters 

 of Trochocyathus, and is therefore referred to that genus. There is no other 

 species of coral with which it could l)e confused ; therefore critical notes are 

 unnecessary. 



Teochocyathus steiatus (Gabb). 



PI. VII, fig. 24; PI. VIII, figs. 1 to 3. 



1864. Trochostnilia striata Gabb. Geol. Surv. California, PalsBontology, Vol. I, p. 



207, pi. xxvi, fig. 195. 

 1893. Trochosmilin striata Boyle. North Amer. Mesozoic Invert. : Bull. U. S. Geol. 



Survey No. 102, p. 290. 

 1897. Trochosmilia striata Merriam. Journ. Geol., Vol. V, p. 771. 



The following is the original description: " Elongate, slender, curved, 

 section circular or subcircular ; epithelium rudimentary, surface marked by 

 numerous prominent stria?, usualh' rounded, of variable size, and often 

 showing a well-marked alternation of larger and smaller ones. Surface of 

 calice unknown." 



Locality. — Divislou B,'near the coal mine at Mount Diablo, California. 



Mr. Stanton obtained a considerable number of specimens of this species 

 in Contra Costa County, California. From a study of these specimens I 

 can give more information concerning the characters of the species, and can 

 determine its generic position with reasonable certainty. The form of the 

 corallum was described well enough by Gabb. Tlie costre are rather prom- 

 inent, subacute, alternating in size, and correspond to all cycles of sejjta. 

 No epitheca was seen on any of the specimens. Sejita rather thick, the 

 inner terminations of all except the last cycle thickened, 44 in number (in 

 thin section studied), two half systems of the fourth cycle being incomplete. 

 Their sides granulate. The interseptal spaces devoid of dissepiments. 

 Columella fascicular, upper surface papillate. The thickenings on the inner 

 ends of the septa without doubt represent pali. Therefore, there are pali 

 before all septa, except those last introduced, and they are arranged in two 



' B is the upper division of Galib's section, and was supposed to be Cretaceous. 



