MIOCENE MOLLUSCA AND CRUSTACEA. 133 
ular annulations, scarcely distinct enough on many of the specimens to be 
recognized. Internally the shell is polished and smooth, but frequently 
interrupted by deeply concave partitions, like those of a cephalopod, and 
readily to be found by cutting off the surface of the tube for a short dis- 
tance. The habits of the tube throughout are much more like that of a 
Serpula than of a Molluscan, but the texture of the shell is Molluscan. 
Formation and locality: In the gray micaceous marls of the Miocene at 
Jericho, N. J. From the collection of the National Museum. 
Family CERITHERIID44. 
Genus TRIFORIS Deshayes. 
TRIFORIS TEREBRATA. 
Plate XxIv, fig. 6. 
Triforis terebrata Heilprin: Proc. Acad. Nat. Sci. Phila., 1887, p. 405; also Triforis 
sp. noy., in list, p. 403. 
Comp. T. monilifera=Cerithium moniliferum H. C. Lea: Trans. Am. Philo. Soe., 1843, 
p. 43, Pl. xxxvul, 1887, p. 405, 
“Spire gradually tapering, nearly parallel sided; whorls flat, orna- 
mented (on the body whorl) with two prominently beaded lines, and two 
alternating lines of smaller beads; on the whorl above the body whorl the 
lowest line is indistinct, or entirely covered over; transverse lines connect 
the beads of the different series; columella smooth, arcuate.” (Heilprin, 
loc. cit.) 
The type of the species is a fragment only, consisting of two and a 
half volutions, embracing in the last one the aperture, the outer lip of which 
is also imperfect, having lost nearly one-third of a volution from its edge. 
The columella is slightly twisted and its lower end slightly channeled. 
From the appearance of the upper of the two volutions present I should 
suppose there had been only the three lines of beads; the upper and lower 
one of large size and the intermediate one much smaller; still on the body 
whorl there are four distinct lines. It has been a pretty species and 
quite distinctly ornamented, but is very closely related to Cerithium moni- 
