296 



Distinguishing Characters. — " Fossil ex- 

 tremely elongate cylindro-conical, having in 



the larger specimens a diameter at the base 

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

 with a length of more than three inches, 

 becoming extremely slender and attenuate 

 towards the apex." 



Found in the Goniatite limestone of the 

 lower Naples shale, usually in a compressed 

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

 Genesee shale, at Section 1 ( rare ). 



The section of this species is more ellip- 



Fig. 230. Brtctrites . . , 



acicuiwn. a crushed tical than in the preceding species, and the 



and flattened speci- 1 l 



men reduced (after protoCOlldl IS Smaller. 

 Hall). l 



Gems GONIATITES. De Haax. 



[Ety. : Gonia, an angle; lithos, stone.] 

 (1825: Monographic 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 saddles 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. 



Gonia tites (Tornoceras*) uniangularis. Conrad. (Fig. 

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

 LXXII.. LXXIV. Clarke: Naples Fauna, p. Ill, et seq. ) 



Distinguishing 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, 



♦Tornoceras (Hyatt i "includes species which * * * have compressed whorls, and 

 annular lobes : the sutures have rounded Baddies on the venter, and rounded lateral lobes 

 with the typical magno-seuarian saddles of the family. The first pair of saddles have no 

 corresponding saddles on the dorsum, and the annular lobes are situated immediately 

 between tin- large dorsal saddles, corresponding to the ma^nosellarian saddles The 

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

 Stage at which the ventral saddles are in a primitive condition has close resemblance to the 

 older stages "f Parodiceras " dienera of Foss. Cephalopoda, p. 320.) 



