457 
The shell is smooth except from strong striz of growth, and oc- 
casional folds as in other species of this group, the casts are all per- 
fectly smooth. A specimen from Phillipsburg has identical 
form and position of siphuncle, and is in collection of Museum of 
Comp. Zodlogy. 
Falcilituttes. 
This genus set apart by Remelé, the type selected being Letuztes 
Decheni equal to Discoceras subcostatum Ang. et Lindstrom.* This 
species has a very close-coiled whorl in the nepionic stage, the um- 
bilical perforation not being figured at all by Angelin and Lind- 
strom, a fact of essential importance when comparing this type with 
Estonioceras. The coiled volutions are three in number according 
to their figures, but the centre may be erroneously drawn. 
The shell has a decidedly quadragonal whorl like that of some 
species of Schroederoceras, and the abdomen is even slightly con- 
cave along the median portion? The lines of growth are strongly 
marked and have a different aspect from those of Estonioceras. 
The hyponomic sinus is deeper and broader and apparently the 
lateral lines rise towards the dorsum in crests, but these really join 
across the dorsum, forming one huge broad, dorsal crest. In other 
words, if figured correctly, the aperture on the free volution must 
have had a very deep hyponomic sinus and huge projecting dorso- 
lateral crests undivided by any dorsal sinus as in Estonioceras. The 
closely coiled volutions may have had lines of growth with dorsal 
sinuses, but if so these disappeared on the free part of the whorls. 
These volutions may also have had a contact furrow, but it must 
have been slight, since it entirely disappears on the early part of the 
free volution in both of the European species mentioned below, 
The sutures have’also ventral saddles with deep lateral lobes. 
Dorsal sutures are not given. 
The siphuncle is much smaller than in Estonioceras and is nearer 
the centre, being but little above this point or centroventren. This 
organ is ellipochoanoidal according to Angelin and Lindstrom 
figures which are very clear and apparently exact. 
There are only two species as yet described, Pulcilituttes Decheni 
*I have not been able to obtain from any library in this vicinity Remelé’s principal 
works, but there is no doubt that he selected Discoceras subcostatum, as described by 
Angelin and Lindstrom. His papers were published in the Festsch. 50 jahr. Jubelf. d. 
Forstakad. Eberswalde, and the Untersuch. u. d. versteinerngsf. Diluvial., ete. 
PROC. AMER. PHILOS. SOC. XXXII. 143. 3F. PRINTED JUNE 27, 1894, 
