INVERTEBRATES. 165 



Genus GONIATITES, de Haan. 



Goniatites, deHaan, 1825. Monogr. Ammonites ct Ooniatites. 

 Aganides [?], Montfort, 1808. Conch. Syst., I, p. 30. 



iF-it could be demonstrated that Goniatites, deHaan, is synonymous with 

 Aganides, of Montfort, as is believed by some eminent Paloeontologists, we 

 would be compelled by the law of priority to adopt Montfort's name for the 

 genus. The locality cited by Montfort (Namur, Belgium), would certainly 

 favor the conclusion that his type was a Goniatite; but as neither his figure, 

 nor his description, enables us to decide beyond doubt, whether it was a Gonia- 

 tite, or, as Hermannsen and others maintain, an Aturia, we do not feel warrant- 

 ed at present in adopting his name for the Goniatite group. Indeed his figure 

 shows apparently some faint indications of a nearly central siphuncle. If this 

 is not merely an accident of shading, and was really intended to indicate the posi- 

 tion of the siphuncle, it would settle the question that it was at least not a Gon- 

 iatite, and that Montfort must have been mistaken in regard to the locality from 

 which his type was obtained. Until this question can be more definitely settled, 

 we prefer to retain de Haan's name Goniatites for this genus. 



Goniatites Lyoni, M. and W. 



PL 14, figs. 11a, 116, lie. 



Goniatites Lyoni, Meek and Worthen, Oct., 1860. Proc. Acad. Nat. Sci.Philad., p. 471. 

 Goniatites hyas, Hall, Dec, 1860. Thirteenth Ann. Rept. Regents Univ. N. Y., p. 102. 



Shell compressed, discoidal; umbilicus large or nearly twice 

 the breadth of the outer whorl from the dorsal to the ventral 

 side, shallow and showing about four-fifths of each inner whorl. 

 Volutions slender and increasing very gradually in size, com- 

 pressed or p,bout one-third deeper from the dorsal to the ventral 

 side than the transverse diameter; rather narrowly rounded on 

 the dorsum, and provided with a shallow concavity along the 

 inner side for the reception of each succeeding inner whorl. 

 Septa moderately distinct, and deeply divided into six* lobes 

 and six saddles; dorsal lobe longer than wide, infundibuliform 



* The sixth lobe is at the middle of the ventral side, and not visible externally. 



