2T2 AMERICAN JOURNAL 



No. 28 a. 0. strenua, Lea; Q. Leidyana, and carinocostata 

 are the same. 



No. 31. G. ohtusa, Lea; G. substricta, Hald., and cadus, 

 Lea, are synonyms. 



No, 37. G. interrupta, Hald., G. Christyi^ Lea, G. instabilis, 

 Lea, and G. ornatella^ Lea, form but one species. 



No. 127. G. acutocarinata, Lea, pagodiformis and torulosa, 

 Anth., are the same. 



No. 157. G. simplex, Say; G. subsolida^ Yanuxemii and 

 Warderiana of Lea are synonyms. 



No. 186 a. G. sordida, Lea; G. plebeia and hrunnea^ Anth., 

 are synonyms. 



No. 191. G. adusta, Anth.; G. Cumberlandiensis, Lea, and 

 G. funebralis, Anth., are synonyms. 



Instead of the name of Anculosa dissimilis, Say, that of 

 carinata, Brug., is adopted. The latter was proposed in the 

 "Encyclop. Methodique, Vers." i., p. 301, 1792, twenty-seven 

 years prior to Say's description. This shell was first figured 

 by Lister. 



American Journal of Science and Arts. No. 117. May, 1865. 

 Remarks on the Beatricese, a new Division of Mollusca: BY 

 ALPHEUS HYATT, JR. 



We condense the material portions of this paper, and re- 

 gret that our space will not allow its re-publication entire : — 



"The Beatricese are long, cone-like bodies, composed of three 

 distinct parts, or layers, in the following order: (1) A central 

 chain of small hollow chambers ; (2) a succession of concen- 

 tric coniform layers ; (3) an external or sub-epidermal layer." 



[These Silurian fossil shells were at first supposed to be 

 plants, and the first species was so described by Mr. Bil- 

 lings.] 



"The Beatricese are very like the Bippuritidse^ both in gene- 

 ral form and the arrangement of the component parts of the 

 shell ; but here again it may be demonstrated that the resem- 

 blance is not so close as it at first appears to be. 



" The geological horizon in which they occur, without other 

 evidence, would alone be sufficient to render their affinity with 

 the Hippuritidse exceedingly doubtfal; but, besides this, the 

 structure, evidently, is not so closely allied to that of the Hip- 

 purite as to the Cephalopod. The shell of the Hippurite is 

 composed of three parts: first, the inner septa, second, the 

 outer layers, which frequently form a porous mass, and third, 

 an external sub«epidermal layer. 





