Hyatt.] 318 [April 4, 



lobes remain rounded until later stages of the growth, the funnel 

 lobes are generally smaller, the larger lateral saddles are also 

 more persistent and retain their forms unchanged even in the ex- 

 treme old stages of the largest specimens. The species are as 

 follows, Manti. (Gon.) latidorsatum, Sandb. Verst. Nass. pi. 8, fig. 

 8, tripartitum, ibid, fig. 7, lamed, fig. 4, 6, are all regarded by 

 Sandoerger as varieties of lamed, but they can be distinguished 

 by their de velopment from each other. Manti. (Gon.) intumescens, 

 Beyr. Rheins. Ueberg. pi. 2, fig. 4, Sandb. ibid, pi. 7, Manti. (Gon.) 

 complanatum, pi. 8, fig. 5, the latter a variety of lamed Sand, 

 both have in adults excessively acute, and involute whorls. Manti. 

 (Gon.) bisulcatum, sp. Keyser, Dom. Schief, Verh. Min. Gesell. 

 St. Petersb. pi. A, fig. 7, seems to be in this genus. In America 

 we have found, Manti. (Gon.) simulator, sp. Hall, Nat. Hist. ~N. 

 Y. Vol. 5, pt. 2, pi. 69, fig. 1,2, Pattersoni, ibid, pi. 72, fig. 1-5, 

 Gon. Goniolobus, Meek, Geol. Expl. 40 Parall. Vol. 4, pi. 9, fig. 5, 

 may possbly be a greatly modified Carboniferous form of this 

 genus with closely approximated septa. Type, Manti. simulator, 

 sp. Hall, Mus. Geol. Surv. Albany. 



Magnosellaridae. 



This family is distinguished by the early development and 

 undivided outlines of the magnosellarian saddles, which induced 

 Sandberger to designate the group as the Magnosellares. The 

 ventral lobes are primitive and undivided, and in the lower forms 

 are small, and really mere funnel lobes breaking the outlines of 

 the ventral suture. This is a purely nautilinian character and 

 the first pair of saddles also retain a similar primitive aspect, but 

 in the higher forms tend to split up and form a first pair of lateral 

 lobes and a second pair of saddles. The first pair of saddles have 

 no corres23ondent on the dorsum but the second pair have corres- 

 ponding dorsal saddles when they are present, as in Maenoceras 

 and Sporadoceras. These facts justify the opinions of Mojsisovics, 

 and others that the sutures of this genus are approximate to 

 those of the Nautilini, and our own observations indicate closer 

 affinity for Anarcestes, than for any other genus. The figures 

 given by Sandberger in Jahrb. d. Nass. Ver. f. Naturk. Vol. 7, 

 1851, pi. 2, of Parodiceras biarcuatum, and amblylobum illustrate 

 this affinity for Anarcestes, especially since these two have 



