3 i6 CRETACEOUS PALEONTOLOGY. 



several of these maculae, but the radial arrangement of the zooecia 

 about them, is generally obscure. The zooecia immediately sur- 

 rounding the maculae are often of larger size and more oblique 

 than those covering the intermediate spaces where they are quite 

 direct, but in worn examples very little difference in size is no- 

 ticeable. The interzooecal spaces, which are solid and concave 

 normally, are pitted in worn specimens as though they contained 

 covered mesopores or vesicles. The unworn covering is minutely 

 punctate, as are also the covers closing some of the zocecal aper- 

 tures. The zooecia form mere inflations of the surface, usually 

 (perhaps always) over one of the maculae, which in that case is 

 slightly raised instead of depressed and pierced by somewhat 

 scattered apertures. An average of nine zooecia occur in 2 mm. 

 Tube walls as seen in fractured specimens, thin beneath the outer 

 crust, minutely perforated, the pores arranged in transverse 

 series with nearly three of the rows in the space equalling the 

 width of a tube. No diaphragms were observed. Length of 

 tubes, i mm. or less." (Ulrich.) 



Remarks. This species was originally described from the 

 Eocene of Maryland, although the Vincentown examples were 

 referred to the species at the same time. In some of the Vin- 

 centown specimens the maculae are scarcely so noticeable as in 

 the Eocene examples, but others agree very closely with those 

 from Maryland. The completely attached colonies have essen- 

 tially the characters of the genus Berenicea, but this species is 

 often more or less free with the lower surface covered with an 

 epitheca. 



Formation and locality. Vincentown limesand, Vincentown 



(154). 



Geographic distribution. New Jersey; also in Eocene of 

 Maryland. 



Genus DIASTOPORA Lamark. 



Diastopora lineata Gabb & Horn. 

 Plate XXL, Figs. 3-4. 



1862. Diastopora lineata. G. &. H., Jour. Acad. Nat. Sci. Phil., 

 2d ser., vol. 5, p. 172, pi. 21, fig. 62. 



