INSTITUTE OF SCIENCE, PHILADELPHIA. 113 



boundary of the whorl upon which it rests, and forms a series of well- 

 marked carinations ; a secondary carination above the basal one, followed 

 (in the direction of the apex) by two prominent, faintly beaded, lines and 

 several less prominent ones in the hollow of the whorl, and these again 

 by several alternately placed lines of less value ; aperture quadrangular ; 

 base flat. 



Length of longest fragment, three inches ; greatest width, .7 inch. 



Turritella Tampse, nov. sp. Fig. 53. 



Shell moderately elevated, the whorls flattened, slightly impressed in 

 the middle, and becoming discontinuous at about a distance of an inch 

 and a half below the apex ; revolving lines distinct on the upper whorls, 

 becoming more or less obsolete on the basal ones, except those in the 

 medial impressed furrow, where they remain distinct, appearing somewhat 

 crowded, and alternate in degree of coarseness; aperture sub-quadrangular; 

 base convex. 



Length ? 



Turbo crenorugatus, nov. sp. Fig. 54. 



Shell moderately elevated, the whorls regularly convex, ornamented 

 with coarse concentric beaded or " roped " lines, which are of unequal 

 sizes, the third and fifth lines below the suture finer than those between 

 which they are placed ; the beads or crenulations oblique (inclining 

 downward to the left), becoming very coarse and irregular toward the 

 aperture, and scaly or imbricated on the base ; the basal lines of nearly 

 equal width, except the one immediately adjoining the labium, which is 

 of about twice the normal width; umbilicus covered; aperture oval; base 

 convex. 



Length (height), 1.2 inch ; width of base, 1.4 inch. 



Most nearly resembles the recent T. crenulatus. 



Turbo heliciformis, nov. sp. Fig. 55. 



Shell dome-shaped, the whorls convex, closely enveloping above 

 toward the apex less so below, ornamented with numerous equally- 

 placed revolving lines, upon one or more of which immediately adjoining 

 the suture there is a faint crenulation ; aperture obliquely-oval ; base 

 convex ; umbilicus deep, round. 



Length (height), .4 inch ; diameter of base, .6 inch. 



Most nearly resembles Turbo (Omphalius) viridis. 



Delphinula (?) solariella, nov. sp. Fig. 56. 



Shell turbinate, moderately umbilicated ; whorls subangular, chan- 

 neled on the basal margin, ornamented with about five concentric beaded 

 lines, the beads largest on the upper lines ; base of shell flattened, indis- 

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