458 
Remelé, sp. Ang. et Lindstrom, and Fucilituites ? Muellaueri, sp. 
Dewitz. This last has the ventral saddles and approximately quad- 
ragonal form of this genus. The sutures also have dorsal saddles 
and the siphuncle is Small and centren. ‘There is a slight contact 
furrow in the coiled volutions, which is still retained, but shows to a 
less degree in the free part of the whorl as figured by Dewitz, and 
the dorsal part of the aperture is flat, not concave. The living 
chamber was evidently entirely free in these two species when full 
grown, since in the figures by Angelin and Lindstrom and by 
Dewitz this is shown. ‘The umbilical perforation in AZwel/auert is 
so much larger than in Dechenz that I refer this species to this genus 
with considerable doubt. ‘The close-coiled volutions are only two 
in number. 
Trochotitide. 
This group was formerly included by the author under the family 
name of Tainoceratidz, but was separated in Carboniferous Cepha- 
lopods Fourth Ann. Rep. Geol. Surv. Texas, and is here placed 
under its proper title. ‘lhe shells are smooth, or with heavy trans- 
verse ridges, which are really primitive costations, but are never 
very prominent. The whorls are nephritic or depressed sub- 
quadragonal or trapezoidal, the venter generally broader than the 
dorsum, and the form is usually nautilian. The sutures as a rule 
have broad and slight ventral lobes and lateral lobes. 
The siphuncle is dorsad of the centre. The generaare as follows: 
Litoceras and ‘Trocholitoceras confined to the Quebec faunas, 
Schroederoceras and Trocholites found in both the Quebec faunas 
and the Lower Silurian. 
Schroederoceras. 
This genus has been described by Schroeder and others as Dis- 
coceras, and as having close affinity with Trocholites. 
The affinity with Discoceras is apparently close, but when one 
considers the heavily costated shells of that genus and the younger 
stages of the conch, it becomes obvious that the species having such 
distinct characters and different modes of development cannot be 
associated according to the mode of research adopted here. 
There are some species like Schroederoceras Eatoni and £Etch- 
wadld?, which approximate in the number and form of the whorls to 
