2t4 AMEEICAN JOURNAL 



"The analogies whicli the Beatricese have with plants in 

 their general aspect, with Eadiates in their internal vesicular 

 structure, and with Hippurites in the arrangement of the 

 parts, are so close as to entirely bury, as it were, their true 

 affinity with Cephalopoda, which only becomes obvious after 

 diligent comparisons." 



•'There still remains a question which I have not been able 

 to solve in a satisfactory manner with the specimens at my 

 command. Are the Beatricese internal or external shells? 

 This problem, so difficult to settle conclusively with regard to 

 the Orthoceratites, is equally puzzling in the structure of Beatri- 

 cese. Their extreme length, cellular structure, and the irregu- 

 larity of the ornamentation, would be almost determinative in 

 favor of their being internal shells, were it not for the aspect 

 of the cast of the animal in the terminal chamber of the speci- 

 men from English Head, which proves that a large portion, if 

 not the whole of the body, was contained within the shell." 



"There are but two known species of the order Ceriolites, 

 both occurring in the Silurian strata of Anticosti." 



"Order CERIOLITES, Hyatt. 



Family CEUIOLIDiE, Hyatt. 

 Genus Beatricea, Billings. 



"Beatricea nodulosa, Billings, is a long cone, tapering very 

 gradually, the central chambers occupying from a fourth to a 

 third of the transverse diameter in adults ; in the young they 

 are larger proportionally, varying from one-half to two-thirds 

 of the breadth of the whole shell. The coniform layers are 

 nearly parallel; the inclination at the lower part, as they 

 trend outward to the circumference, being decreased very 

 slowly. The external shell is closely set with tubercles, and 

 covered with granular points. The size, as nearly as could 

 be inferred from fragments, is not over four feet long, by from 

 three to five inches in diameter at the larger end. 



"J5. undulata is a much larger species, one fragment found 

 by the expedition being thirteen and a half feet long, by 

 eight and a half inches in diameter at the larger end, and 

 judging by the inclination of the sides, the length of the en- 

 tire shell, when living, was certainly not less than twenty 

 feet. The chambers are very small, frequently in adults not 

 occupying more than one-tenth of the transverse diameter. 

 The coniform layers are more widely separated in the adults 

 than in the young; their inclination as they trend outward to 

 the periphery is more decided, and they nowhere assume the 

 parallel appearance of the same parts in Beatricea nodulosa. 



"The exterior is granulated and ornamented by ten or more 

 prominent longitudinal ridges and intervening broad, shallow 

 channels." 



