INSTITUTE OF SCIENCE, PHILADELPHIA. 107 



and show a tendency to become lamellar, especially toward the base of 

 the shell ; the spaces between the more prominent lines covered with 

 numerous finer (tertiary) lines, and a median secondary line ; aperture 

 somewhat more than one-half the length of shell, the (slightly-deflected) 

 canal about one-half the length of aperture. 

 Length, 1.6 inch ; width, .9 inch. 



Murex crispangula, nov. sp. Fig. 38. 



Shell strongly angulated, markedly rugose; spire elevated, of about 

 five volutions ; varices six (on the body-whorl), sharp, deflected obliquely 

 toward the base of the shell ; surface of shell very strongly lined, the 

 lines of three series, primary, secondary, and tertiary ; those of the first 

 series about ten on the body -whorl, very prominently elevated on the 

 varices, becoming spinose toward the base of the shell and on the aper- 

 tural varix ; aperture slightly exceeding one-half the length of shell, 

 the very narrowly-contracted canal gently deflected. 



Length, 1.6 inch; width, .7 inch. 



This species may be readily distinguished from M. lama>costa, which 

 it somewhat resembles, by its narrower outline, the smaller number of 

 and greater sharpness of its obliquely directed varices, and its generally 

 rugose surface. 



Murex tritonopsis, nov. sp. Fig. 39. 



Shell consisting of about six regularly-convex whorls ; varices, three 

 on each whorl, profoundly convex and entirely destitute of spines or 

 lamellar processes ; two more or less nodulose costse between each pair 

 of varices ; aperture exceeding one-half the length of shell, the canal 

 deflected, very narrow ; surface of shell covered with closely placed, 

 elevated revolving lines, which regularly alternate in size. 



Length, 1.2 inch; width, .7 inch. 



This species very closely resembles Murex Mississippiensis, Conr., from 

 the Vicksburg beds, but may be distinguished by the presence of two 

 sharply-defined costae between each pair of varices, and in the character 

 of the revolving striae, which are very much finer and more crowded in 

 the Mississippi fossil. 



The young of M. pomum somewhat resembles the Florida fossil, but 

 may be readily distinguished by the superior angulation of the whorls 

 and the irregularity of the costation. 



Murex trophoniformis, nov. sp. Fig. 40. 



Shell having the form of Trophon ; whorls about six, sub-angulated 

 superiorly, very convex ; varices placed at irregular intervals, four on 

 the body-whorl, the intervariceal spaces with one, or two, or even three 

 secondary costs ; aperture about two-thirds the length of shell, contracted 



