206 



Distinnuisliiui!; Chnracters. — " Fossil ex- 

 tremely elon<2,ate cvliiidro-eoiiical, haviiio- in 

 the larger sjieciiiiens a diaineter at the base 

 (in its flattened condition) of about 7 mm., 

 with a length of more than three inches, 

 becoming extremely slendei' and attennate 

 towai'ds the apex.*" 



Found in the Goniatite limestone of the 

 lower Naples shale, nsnally in a compressed 

 condition, at Sections 1 to 3 (rare); lower 

 Genesee shale, at Section 1 (rare). 



The section of this species is nu)re ellip- 



FlG. 230. BiirtriteK • i , • i t . -, , 



acicuhim. altlisIik,! tical than m the preceding species, and the 



and flattened si)Hci- '- o i ? 



men reduced (after i )rot()COnch is Smaller. 

 Hall). 1 



Gexis GONIATITES. De Haax. 



[Ety. : Goiiia, an angle; lithoft, stone.] 

 (l82o: ]\Ionograpliia^ Ammoniteorum et Goniatiteorum, p. 159.) 



Shell coiled in a single plane, the whorls embracing, and 

 sometimes closing, the umbilicus; sutures zigzag, with for- 

 ward-bending .sv/f/J/av and backward-bending lobes. Living- 

 chamber long, never expanded; siphuncle on the outer side 

 of the volutions (venter) marked by siphonal lobes and 

 sometimes saddles in the suture. 



GoxiATiTES (ToRXOCERAS*) uxiAXorLARis. Courad. (Fig. 

 231.) (Pal. N. Y., Vol. V., Pt. II., p. 444, Pis. LXXI., 

 LXXIL. LXXIY. Clarke; Naples Fauna, p. Ill, et seq. ) 



Distill <>uishmg Characters. — Closed umbilicus; sutures 

 with a prominent saddle occupying the inner half of the 

 disc, thence abruptly recurving, and describing a some- 

 what semi-elliptical curve, which limits the deep lateral 

 lobe; in the ventral curve, upon the peripheral margin, 



*Tornoeeras (Hyatt) "includes species which * * * have compressed whorls, and 

 annular lobes : the sutures liave rounded saddles on the venter, and rounded lateral lobes 

 with the tyjiieal niaKno-sellarian saddles of the family. The first pair of saddles have no 

 corresponding saddles on thn ilorsiun. and the annular lobes are situated immediately 

 between the larKt^ dorsal saddles, curresponding to the magnosellarian saddles The 

 ventral loljes and sutures in the larval stages are similar to the adults of Anarcestes. The 

 stage at wliicli the ventral saddles are in a iiriiiiitive condition has close resemblance to the 

 older stages of Parodiceras." (.Genera of Foss. Cephalopods, p. 330.) 



