134 PALEONTOLOGY OF NEW JERSEY. 
liferum H. C. Lea, if not identical. The sutures are, however, much more 
distinct, an inconstant feature, but the only difference easily seen. 
Locality: The specimen is from Mr. Ayers’s marl pits, near Shiloh, N. J., 
and is the property of Miss Ella Tyndall, of Philadelphia, from whom it 
was borrowed through Prof. Heilprin. 
Family TROCHID2. 
Genus LEIOTROCHUS Conrad. 
Proceedings Acad. Nat. Sci. Phila., 1862, p. 569. 
‘Polished, entire, without umbilicus; base of columella with two den- 
ticles.” 
The above is Mr. Conrad’s description of this genus given as cited 
above, and is the only reference or description I can find. He classes four 
species under it in the list in which the above description is embodied, 
namely: Monilea distans Conrad, Trochus eboreus Wagner, Turbo caperatus 
Conrad, and Monodonta kiawahensis Tuomey and Holmes. Of the four 
there is not one which agrees entirely with the characters embraced in the 
diagnosis, as Trochus eboreus Wag. has but one denticle on the columella, 
but otherwise agrees; Monodonta kiawahensis T. and H. has a large umbil- 
icus, and agrees very well otherwise with the genus Monilea; Monilea distans 
Conrad, according to his own description of the species, has the “umbilicus 
narrow, profound;” while Turbo caperatus Conrad, in his own language, has 
the “columella slightly swelling near the center,” so it would not show the 
two denticles required by the generic diagnosis. The species 7. eboreus 
Wagner is the species which approaches the nearest and would require that 
the description should be emended so as to read columella obsoletely denticulate, 
if it is to be used at all—for which there seems but little reason. The 
diagnosis would then read: Polished, entire, without umbilicus; columella 
obsoletely denticulate. 
