696 



CEPHALOPODA. 



[COM. MET. 



description is such as to establish it, for 



the species do not properly belong to 



Nautilus. 

 Oastriocera8 compressum, see Goniatites com- 



pressus. 

 Gomphoceras angustum, Newell, 1888, Proc. 



Bost. Soc. Nat. Hist., vol. 2:5, p. 475, Ni- 

 agara Gr. 

 clarki,S. A. Miller, 1891, Advance Sheets 



17th Rep. Geo. Sur. Ind., p. S8, St. 



Louis Gr. 

 hertzeri, see Hexamoceras hertzeri. 

 lin^are, Newell, 1888. Proc. Bost. Soc. Nat. 



Hist., vol. 23, p. 473, Niagara Gr. 

 manitobense, Whiteaves, 1890, Trans. 



Roy. Soc. Can., vol. 8, p. 102, Devonian, 

 parvulum, Whiteaves, 1891, Can. Rec. of 



Sci., p. 298, Up. Sil. 

 projectum, Newell, 1888, Proc. Bost. Soc. 



Nat. Hist., vol. 23, p. 476, Niagara Gr. 

 wabashenee, Newell, 1888, Proc Bost. Soc. 



Nat. Hist., vol. 28. p. 470, Niagara <ir. 

 Goniatites baylorensis, White, 1891, Bull. 



U. S. Geo. Sur. No. 77, p. 19, Permian 



Gr. 

 brownensis, 1891, S. A. Miller, Advance 



Sheets 17th Rep. Geo. Sur. Ind., p. 90, 



Waverly Gr. 

 compressus, Hyatt, 1891, (Gastrioceras 



compressum,) 2d Ai. n. Rep. Geo. Sur. 



Texas, p. 355, Coal Meas. 

 gorbyi. 8. A. Miller, 1891, Advance Sheets 



17th Rep. Geo. Sur. Ind., p. #0, Chou- 

 teau limestone, 

 greenii, S. A. Miller, 1892, Advance Sheets 



18th Rep. Geo. Sur. Ind., p. 76, Knob- 

 stone Gr. 

 indianensic, S. A. Miller, 1891, Advance 



Sheets 17th Rep. Geo. Sur. Ind., p. 90, 



Waverly Gr. 

 leviculus, Miller & Faber, 1892, Jour. Cin. 



Soc. Nat. Hist., vol. 14, p. 167, St. 



Louis Gr. 

 limatus. Miller & Faber, 1892, Jour. Cin. 



Soc. Nat. Hist., vol. 14, p. 166, St. 



Louis Gr. 

 missouriensis, Miller & Faber, 1892, Jour. 



Cin. Soc. Nat. Hist., vol. 14, p. 164, Up. 



Coal Meas. 

 occidenlalis, Miller & Faber, 1892, Jour. 



Cin. Soc. Nat. Hist,, vol. 14, p. 166, 



Coal Meas. 

 sciotoensis, Miller & Faber, 1892, Jour. 



Cin. Soc. Nat. Hist., vol. 14, p. 165, Wa- 

 verly Gr. 

 Goniocekas Iambi, Whiteaves, 1891, Trans. 



Roy. Soc. Can., vol. 9, p. 86, Tren- 

 ton Gr. 

 Gyroceras canadense, G. filicinctum, G. sub- 



mammillatum, Whiteaves, 1890, Trans. 



Roy. Soc. Can., vol. 8, pp. 106, 107, 



Devonian. 

 magnificum, refer to Apsidoceras mag- 



nificum. 

 Hexamoceras, Hyatt, 1883, Proc. Bost. Soc. 



Nat, Hist., vol. 22, p. 278. [Ety. hex, six; 



mm)*, part; keras, horn.] This genus is 



distinguished from Gomphoceras only 



by the aperture. In Gomphoceras there 



is only one lateral branch on each side 

 of a longer median aperture, which gives 

 the mouth a T-shape; in Hexamoceras 

 there are three branches on each side 

 of the median aperture, increasing in 

 length toward the summit. Type H. 

 panderi. 



cacabi forme, Newell, 1888. Proc. Bost. Soc. 

 Nat. Hist, vol. 23, p. 481, Niagara Gr. 



delphicolum, Newell, 1888, Proc. Bost. 

 Soc. Nat. Hist, vol. 23, p. 479, Ni- 

 agara Gr. 



hertzeri, Hall & Whitfield, 1875, (Cyrtoc- 

 eras hertzeri,) Ohio Pal., vol. 2, p. 150, 

 Niagara Gr. 

 Homalocekas, Whiteaves, 1800, Trans. Roy. 

 Soc. Can., vol. 8, p. 104. [Ety. homalos, 

 level; kfra$, born.] Shell consisting of 

 a slender tube, which is broadly and 

 strongly arcuate, curved in the same 

 plane, and much flattened laterally, its 

 venter or outer border being very nar- 

 row, truncated, and depressed in the 

 center; sutural line consisting of two 

 very narrow saddles, with an equally 

 narrow sinus between tlieni on the ven- 

 ter, a broadly concave sinus or lobe on 

 each of the sides, and a rather narrow 

 saddle on the dorsum ; siphuncle cylin- 

 drical, exogastric, and placed near the 

 venter or outer and convex margin ; 

 body-chamber long, occupying about 

 one-third of the entire length. Type 

 H. planatum, which is described at the 

 same place from the Devonian. 

 Lituites eatoni, L. eatoni var. cassinensis, 

 L. internistriatus, L. seelyi, are from the 

 Calciferous. 



magnificu8, refer to Apsidoceras mag- 

 nificum. 

 Medlicottia, Waagen, 1879, Pal. Indica, 

 Ser. 13, pp. 39, 83. [Ety. proper name.] 

 Shell discoid and volutions deeply em- 

 bracing; lobes divided by single lingui- 

 form marginal saddles, or trifoliate or 

 divided saddles; ventral lobes deep 

 and undivided ; the first pair of saddles 

 are narrow, long, and the margins cut 

 by several lobes and saddles growing 

 progressively longer internally ; numer- 

 ous auxiliary lobes are generated from 

 the marginal divisions in the outlines 

 of the first pair of saddles, and from 

 the division of large magnosellarian 

 saddles near the umbilicus. Type M. 

 primis. 



copei, White, 1889, Am. Nat., vol. 23, p. 

 117, and Bull. U. S. Geo. Sur., No. 77, 

 Permian Gr. 

 Metacoceras Hyatt, 1883, Proc. Bost. Soc. 

 Nat. Hist, vol. 22, p. 268. Nautiloid 

 shells, with a wide umbilicus perfo- 

 rated in the middle; volutions subquad- 

 rangular, bearing nodes on the dorso- 

 lateral sides, slightly embracing; si- 

 phuncle eccentric on the dorsal side. 

 Type M. sangamonense. 



cavatiforme, M. dubium, M. hayi, M. in- 

 conspicuum, M. walcotti, Hyatt, 1891. 



