MIOCENE MOLLUSC A AND CRUSTACEA. 133 



ular annulations, scarcely distiiict enough on many of tlie 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 CERITHERIID^E. 



Genus TEIFOEIS Deshayes. 



Tkiforis terebrata. 



Plate XXIV, fig. 6. 



Triforis terebrata Heilpriu : Proc, Acad. Nat. Sci. Phila., 1887, p. 405 ; also Triforis 



sp. nov., in list, p. 403. 

 Comp. T. monilifera=Gerithium moniliferum H. C. Lea: Trans. Am. Philo. Soc, 1843, 



p. 43, PI. XXXVII, 1887, p. 405. 



"Spire gi-adually tapering, neai'ly 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 entu'ely 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-thii'd 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 tbree 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 distmctly ornamented, Ijut is very closely related to Cerithium moni- 



