489 
lite, with very broad whorls quite similar to those of his Z. con- 
tractus. 
‘TROCHOLITES DEPRESSUS. 
CLYMENIA DEPRESSA, Eichw. (Leth. Ross., Pl. 1, Fig. 5). 
TROCH. DEPRESSUS, Schréder (Ceph. d. Untersil., Pal. Abt., Dames 
et) Kayser, v, heft 4, Pl..i, Fig. 4). 
TROCHOLITES MACROSTOMA, Schroder (Ceph. d. Untersil., Pal. Abt., 
Dames et Kayser, v, heft 4, Pl. i, Fig. 1). 
TrRocH. CONTRACTUS, Schréder (zd¢d., Pl. i, Fig. 2). 
Excessively broad whorls and deep umbilici but no lateral zones. 
Living chamber about one-half volution in length according to 
Schréder’s drawings. Schréder also describes the following species : 
Trocu. orsis, Schréder (zézd., Pl. i, Fig. 23). 
‘¢  MACROMPHALUS, Schréder (zéid., Pl. i, Fig. 5). 
‘¢  SORAVIENSIS, Schréder (zéz7., Pl. ii, Fig. 1). 
TROCH. REMELEI, Schréder (zézd¢., p. 18), was described as 7. zn- 
congruus by Ang. et Lindst. (7vag. Sz/., Pl. ix, Figs. 15-18), and this 
has a living chamber not quite one-half a volution in length. His 
Troch. damest (tbid., Pl. v, Fig. 2) shows sculpturing and form of 
the young which appears to place it in the genus Schroederoceras 
rather than in Trocholites and it has been referred to that genus. 
Trocholites circularis, Mill. et Dyer, of the Cincinnati group of 
the Hudson river, is probably a distinct species. The type is in the 
Museum of Comparative Zodlogy. This has an aperture like that 
of Z. ammonius and length of living chamber as in that species 
about one-half of a volution. The whorls are not so stout as in 
ammonius, the sides being slightly compressed, the abdomen nar- 
rower than the dorsum. 
TROCHOLITES DYERI, N. sp. 
This is a form in the Dyer collection from the Cincinnati group, 
having aform of whorl broader and quite like that of Z. ammonius, 
but with a longer living chamber and distinct aperture. 
The living chamber is considerably over one-half of a volution 
in length and the lateral and ventral edges of the aperture are flar- 
ing like the mouth of a trumpet. This gives extraordinary promi- 
nence to these parts and especially to the hyponomic sinus. The 
umbilici were not seen, but are probably deeper than in Z. ammo- 
PROC. AMER. PHILOS. SOC. XXXII. 148. 33. PRINTED JUNE 380, 1894. 
