78 ANNAL8 NEW YORK ACADEMY OF SCIENCES 



median line. The shoulder on the last three volutions is nearly obsolete, 

 being defined merely by the median row of low nodes. 



The aperture is of the form usual in this group, with a narrow callus 

 on the inner lip, a strong posterior tooth and a short anterior canal. The 

 outer lip is thin and slightly crenulated. 



Horizon and locality: Upper Oligocenic (Aquitanian). Saucats, France. 

 No. 312.3, Museum of Comparative Zoology. 



Eemarks : This species continues into the Miocenic, but the specimens 

 studied are from the Oligocenic. Except for its small size, the shell is 

 closely similar to V. vulgatum, and it may well be the immediate ancestor 

 of that species. 



Vulgocerithium pupaeforme Basterot? 



1825. Cerithium pupccforme Basterot, Memoire geol. sur les environs de Bor- 

 deaux, p. 58, pi. 3, fig. 18. 



1906. Dizo)nopsis ptipa'forme Cossmann, Essais de Paleoconch. Comp., VII, 

 147, pi. XII, figs. 22-24. 



Measurements : Length, 12 mm. ; greatest diameter, 4.8 mm. ; apical angle, 

 36.5°, changing to 26° on the last three volutions; sutural angle, 76°. 



The protoconch of this species is not preserved, but a volution .6 mm. 

 in diameter probably represents about the second volution beyond it. 

 This whorl is ornamented by two equal spirals, and on the next volution 

 the spirals are crossed by ribs. On the third volution of those preserved 

 a spiral is added between the two primary spirals and one Just below the 

 suture. On the later volutions numerous fine spirals appear until those 

 of the third order may be recognized. On the body volution the shoulder 

 is less prominent and the nodes formed by the crossing of the ribs and 

 the sub-sutural spiral are larger, so that without a lens the surface ap- 

 pears to be ornamented by two rows of nodes, the lower of which is formed 

 by the crossing of the ribs and the shoulder. The body volution has two 

 or three strong spirals, with finer intercalated ones on its lower slope. 



The aperture is elongate oval, with a broad and thick callus on the 

 inner lip. The siphonal canal is long and slightly curved. The outer 

 lip is thin and not expanded. 



Horizon and locality: Oligocenic (Aquitanian). Saucats, near Bordeaux. 

 No. 2.521, INIusoum of Comparative Zoology. 



Eemarks : The original description of Cerithium pupcpforme has not 

 been obtainable, and the reference to this species is somewhat doubtful. 



