Cephalapoda. gg Scaphitep. 



larvaeformis, M. & H. 1856, Proc. Acad. p. 58. Nebraska. C. 



'■^Mandanensis, Morton, Sp. (Conradi ?), Meek & Hayden, 1856, 

 Proc. Acad. 281. 



NicoUetu, Morton, Sp. (Conradi?), M. & H. Proc. Acad. 1856, 

 281. 



nodosus, Owen (S. (Ammonites?) nodosus). Rep. I. N. M. 



581, 8, 4. Nebraska. 0. 



nodosus, var. Irevis, M. & H. Proc. Acad. 1860, 420. Nebraska. C, 



nodosus, va?'. exilis, M. & H. ibid. Nebraska. C. 



nodosus, var. quadrangular Is^ M. & H. ibid. Nebraska. C. 



nodosus, var. plenus, M. & H. ibid, p. 177. Nebraska. C. 



obliquus, Sow. M. Con. 53, 18, 1, 2. E., Fr. U. G. 



ornatissimus, d'Orb. Prod. 214. Fr. C. 



ornatus, Roera. Nord. Kreid. 91, 13, 8. G. C. 



Phillipsii, Bean. Sp. (Hamites), d'Orb. Prod. 114. E. G. 



plicatellus, Roem. Nord. Kreid. 91, 13, 7. G. C. 



pulcherrimus, Roem. ibid, 91, 14, 4. G., Fr. 0. 



reniformis, Morton (hippocrepisywy.). Synopsis, 42, 2, 6. 



Rochatianus, d'Orb. Prod. 147. Fr. U. G. 



Roemeri, d'Orb. Prod. 214. G. C. 



semicostatus, Roem. Kreid. Tex. 35, 1, 5. Texas. C. 



strmtus, Mant. (aequalis), Geol. Suss. 119, 22, 3-12. 



suhi^eni/ormis, d'Orb. (hippocrepis), Prod. 214 (improperly re- 

 ferred to 31orton, who never described such a species). 



Texanus, Roem. Kreid. Tex. 35, 1, 6. Texas. C. 



Vermiculus, Shumard, Trans. Acad. St. Louis, 1860, p. 594. 



Texas. 0. 



Warreni (ii), Meek & Hayden, Proc. Acad. 1860, p. 177. Ne- 

 braska. C. 



SOLENOCERAS, Con. 1860.t 



annulifer, Morton, Sp. (Hamites), Con. Jour. Acad. vol. iv, 2d 



s., p. 284. N. Jersey, Ala. C. 



* Although the typical forms of these *' species"' (?) are very distinct from 

 each other and can generally be recognized at a glance, I have never been able 

 to detect any diflferenee in the septa of Morton's types ; and the number and ar- 

 rangement of the ribs and tubercles vary so, that I cannot agree with my friends, 

 Messrs. Meek and Hayden, in considering them distinct. They might well be 

 designated for convenience, S. Conradi var. Abyssinus, Mandanensis, Nicolletii, &c. 



t Although I agree with Mr. Conrad in believing this to be a good genus, still, I 

 fear that his diagnosis of the genus may be incorrect in one particular. He says 

 that the large portion is " suddenly recurved." It may be the case, but the evi- 



VOL. Till. — M 



