298 



species. (For discussion of the immature stages, see 



< Luke's Naples Fauna.) 



Found in the Naples shales of Big Sister and Farnum 



creeks ; and on the Lake Shore, near Angola. (Cla rke. ) 

 Goniatites (Probeloceras*) lutheri. Clarke. (Fig. 



233.) (Bull. 16th U. S. Geol. Surv., p. 50, PI. II. Clarke: 



Naples Fauna, pp. 90-102.) 

 Distinguishing diameters. — - Shell widely umbilicated, 



more so than any species with which it 

 is associated * * *. Septa numerous 

 and closely appressed * *; the sutures 

 are characterized by their acute lobes 

 and saddles; ventral saddle very small, 

 short, and very slightly rounded, the 

 two lateral lobes strong and acute ; the 

 lateral saddle very strong and acute, 



Fig. 233. Goniatites " n 



(afte7i''iark»'M Ving sutures with its sides somewhat rounding; the 



dorsal saddle well defined and rounded, 

 with a slight, sharp carinal lobe * * *; the septa are so 

 closely crowded together that they are very nearly parallel 

 to each other except at the apices of the lateral saddles. 

 where the distance between them is somewhat greater than 

 elsewhere; surface markings * * * finely incised, equi- 

 distant lines, curving gently forward as they near the dorsal 

 surface * *." ( For a discussion of the immature stages, etc., 

 see Clarke's Naples Fauna.) 



Found in the Goniatite concretions of the lower Naples 

 shale, at Sections 1 to 4. 



Goniatites complanatus. Hall. ( Fig. 234. ) ( Pal. N. Y., 

 Vol. V., Pt. IF, p. 455, Fl. LXX.) 



This species was originally described in the Report on the 

 Fourth Geological District, from a, compressed specimen 

 from the Naples shales of Cashaqua Creek. {Clymenia (?) 



♦Probeloceras, Clarke, 1898, Naples Fauna, p. 90, has the following diagnostic characters, 

 differentiating it from other Qomatites: "DiscoidaJ, laterally compressed, umbilicated 

 shells, with a narrow peripheral hand, concave and with raised edges in immature stages, 

 convex in the adult. Suture with a single large and acutely-angled lateral saddle, and two 

 acute lol.es ; ventral and sub-lateral lobes rounded. Early stages show a gradual derivation 

 of the suture from a manticoceran outline by the sharpening of the principal saddle and 

 sub-lateral lobe." 



