1883.] 315 [Hyatt. 



The similarity of the funnels and funnel lobes to those of the 

 Nautilinidae, may be seen in Sandberger's figures in Jahrb. d. 

 Nass. Ver. f. Naturk. Vol. 7, 1851, pi. 2. The Glyphioceraticlae 

 and Prole ce an itidae have undivided ventral lobes in the lower 

 or transitional genera, and divided ventral lobes and cloiochoa- 

 nitic funnels in the higher and later occurring forms. Triainoc- 

 eras and Pronorites, have transitional ventral lobes which may 

 be considered as undivided, and all the remaining genera have 

 the short, collarless type of funnel. The excessively short, rapidly 

 narrowing funnels, and the similar character of the breaks which 

 they make in the sutures of the ventral side, is a marked, and 

 highly interesting peculiarity, and led to our designating the 

 whole group at first as Epichoanites. 1 We supposed that all the 

 following genera could be included in this group, and farther 

 characterized as having simple funnels without collars. 



Dr. Branco, however, in Zeit. Deutsch. Geol. Gesell. 1880, p. 

 607, note, made us aware that Beyrich's observation on Glyph. 

 (Gon.) sphaericum, and Sandberger's figure of Glyph. (Gon.) 

 crenistria Verst. Nass. pi. 5, fig. 1, showed that the siphonal col- 

 lar was present in both of these species. Branco's statement that 

 our definition of a collar may be regarded as a mere question of 

 opinion cannot be sustained. The microscope makes it evident 

 that the fore-reaching part of the septum is not like the posterior 

 part. The fore-part is an open collar around the siphon, while 

 the hinder part is a true funnel, interrupting the siphon as in our 

 figure, Embryo. Ceph. Bull. Mus. Comp. Zool. 3, No. 5, pi. 2, fig. 15. 

 Sometimes also as in the cases above cited, and in the type of 

 Schistoceras described farther on, it is easy to see with unassisted 

 eyes, that the true funnels below and the collars above are distinct 

 from each other. 



Prim ordialidae. 



This group which is closely allied to the Nautilinidae, posse se 

 remarkable interest as the most primitive series in which many of 

 the essential differentials of the Ammonitinae first make their ap- 

 pearance. The ventral lobes are very large, and are divided by 



1 We are not yet satisfied that this wcmld not be a convenient descriptive designation 

 for the whole of the Cloiochoanites [Transitiones] or all the Goniatitinae, except the 

 Nautilinidae. 



