505 
Cycloliturtes. 
This generic name was given by Remelé, who has done more 
than any other one author to clear up the relations of the different 
forms of Lituitidee. The species mentioned by him was Cyclolituctes 
applanatus, and to this Holm added a new form, Cyclolituites lyn- 
ceus. His drawings show that Zetuctes Lynnensis, Kjerulf,* is a spe- 
cies of this genus. The drawing made by Barrande of this last is 
defective in representing the umbilical perforation as too large. 
Kjerulf’s drawing gives this much smaller. It also gives the lines 
of growth as bending apically on the first volution and first half of 
the second volution. They then change to the peculiar forward 
bend of the Lituidz, and without doubt the aperture changes at 
this time also to the outline of the adult, so that this is the an- 
ephebic substage. The hyponomic sinus is narrow and deep, and 
the crests on the abdominal angles, at first blunt in the anephebic 
stage, become more prominent in the ephebic stage. The sides 
have lateral sinuses and probably the dorsum is occupied by a crest. 
Only the last quarter of the outer volution is free. Schréder 
doubts whether this is a distinct genus, thinking that it may prove 
to be the young of true Lituites. 
CYCLOLITUITES AMERICANUS. 
Loc., Gargamelle Cove, Newfoundland. 
This species has a quadragonal whorl with somewhat flattened 
lateral zones. The abdomen is also depressed, but with a slightly 
gibbous central zone and linear ventral channels on either side, the 
abdominal angles appearing, in consequence, as lateral ventral 
ridges. ‘The lines of growth show that the usual hyponomic sinus 
was present in the aperture, with sharp, narrow crests on the 
abdominal angles and broad lateral sinuses on the sides. The lines 
of growth on the venter are crossed by a secondary system due to 
the impression of the dorsal lines of an outer whorl, which has 
been broken off in this specimen. ‘These show that the aperture 
has a prominent median dorsal crest and that the coiling was close, 
as in other species of this genus. 
The sutures seen through the thin shell are nearly straight at 
first, then in the ephebic stage become flexed with very slight 
lateral lobes and ventral saddles. There are probably slight flex- 
* Vivies i Christiania, p. 14, 1865. 
PROC. AMER. PHILOS. SOC. XXXII. 143. 3L. PRINTED JULY 9, 1894. 
