594 CRETACEOUS PALEONTOLOGY. 



has a steeper posterior slope than the true C. dumosum. Figure 

 12 of the same author, an enlargement to illustrate the surface 

 characters of C. dumosum, also proves upon examination of the 

 specimen, to be taken from a member of the species under con- 

 sideration; the illustration is not an accurate representation of 

 the characters of the specimen, the costae being too narrow, the 

 interspaces too wide, and the spines not enough compressed 

 laterally. The internal cast used by Whitfield as the orginal 

 for his figures i and 2 of C. multiradiatum seems to be a mem- 

 ber of this species also; a specimen in the recent collections of 

 the Survey from the Navesink marl near Crawfords Corner 

 agrees almost exactly with this illustration and it is undoubtedly 

 a member of the species under discussion. The enlarged illus- 

 tration, figure 3, given to represent the surface characters of 

 this same species, is much overdrawn, the original mould from 

 which the gutta-percha impression was taken being altogether 

 too imperfect to show to what species it belongs. 



This common New Jersey form apparently cannot be referred 

 to any one of the three species already mentioned, but the speci- 

 men Whitfield has illustrated as the type of C. (Fragum) tenui- 

 striatum is apparently a member of this species, although an 

 undersized and rather abnormal one, and the name tenmstriatum 

 is therefore taken for the species although it has to be trans- 

 ferred from the sub-genus Fragum to Criocwdium. 



Formation and locality. Merchantville clay-marl, near Mat- 

 awan (101, ioo 4 ), near Jamesburg (139, 140, 141), Lenola 

 (163), Merchantville (162); Marshalltown clay-marl, near 

 Swedesboro (177, 180), Marshalltown (190); Wenonah sand, 

 near Marlboro (130) ; Navesink marl, Atlantic Highlands (108), 

 Middletown (113), near Red Bank (120), near Crawfords Cor- 

 ner (i26 7 ), near Holmdel (i28 3 , I28 5 , 127), Marlboro .(131) , 

 Cross wicks Creek (149, 195), near Mount Laurel (166). 



Geographic distribution. New Jersey. 



Cardium pilsbryi n. sp. 



Plate LXV., Figs. 11-12. 



Description.' Shell rather small, highest posteriorly, usually 

 a little wider than high, the dimensions of one of the type speci- 



