1895.] NATURAL SCIENCES OF PHILADELPHIA. 79 



the posterior canal extends nearly or quite to the apex of the spire, 

 and recurving descends to near the body whorl. The only orna- 

 mentation is the spiral striation at the base of the body whorl, and 

 -sometimes faint costse near the apex. 



Localities. Two miles east of Alto, Cherokee Co. ; near McBee 

 School-house, Cherokee Co.; Collier's Ferry, Brazos River; 2 miles 

 west of Alto, Cherokee Co. ; Sulphur Springs, Rusk Co. ; Robbins' 

 well, Houston Co., Tex. 



Geological horizon. Lower Claiborne Eocene. 



Type. Texas State Museum. 



Genus CEEITHITJM. 

 CeritMum webbi nov. sp. PI. 9, fig. 3. 



Specific characterization. General form of young specimens as 

 shown in the figure; whorls about 9 ; spiral ones marked by two 

 submedial approximate spiral rows of crenules or nodes above which, 

 and just below the suture, is a third row with smaller crenulations ; 

 suture deep and broad; body whorl marked somewhat as those above 

 though the lower submedial row of crenules is faint, and below it to 

 the end of the beak occur spiral raised lines of varying strength ; the 

 entire surface is apparently covered with minute revolving lines ; 

 lines of growth on the body whorl start at right angles to the suture 

 above, pass downward to the middle of the whorl, curve gradually 

 forward and, after reaching the base of the whorl, slowly again curve 

 backward and pass downward on the canal. 



Locality. Kio Grande, 13 miles by river below Laredo, or 9 by 

 river above the Webb-Zapata County line, Texas side. 



Geological horizon. Lower Claiborne Eocene. 



Type. Texas State Museum. 



Ceritblum penrosei nov. sp. PI. 9, fig. 4. 



Specific characterization. Whorls at least 15, gradually tapering, 

 ornamented as follows: by (1) about seven laterally compressed, 

 oblique subcentral or basal nodes, or costse on each whorl, those on 

 the smaller whorls of the spire not so distinctly defined as represented 

 by the figure; by (2) spiral lines or stride, about five of which are 

 strong and occupy the lower cue-third of each whorl, three or four 

 more are finer and occupy a narrow, irregular central zone, while 

 four or five more occupy the upper or nou-costate portion of the 

 whorls. 



