GASTEROPODA OP THE LOWEE GREEK MARLS. 107 



by Dr. Britton, and one cast from the collection of Mr. Joseph McFarland, 

 of Philadelphia. 



CiTHAEA CrOSSWICKENSIS, 11. Sp. 



Plate xiii, Figs. 7, 8. 



Shell of moderate size or larger, subfusiform or turricnlate, the spire 

 as long as or longer than the length of the body volution and beak, only 

 moderately slender, the apical angle being about 30° to 35°, and the num- 

 ber of volutions probably about five; all the specimens being imperfect 

 and mostly casts, the exact number can not be determined ; body volution 

 large in proportion to the others, quite ventricose in the upper part and 

 contracted below to form the short beak; upper volutions only moderately 

 ventricose; suture, in the casts, strongly marked and the volutions rather 

 abrupt on the upper margin; aperture large, angular above, and more 

 sharply so below; columella strong, leaving a moderately large cavity by 

 its removal, which, in the most perfectly formed cast, shows evidence of a 

 single, rather strong, oblique plication on the lower part; volutions marked 

 by distant, strong, and angular vertical folds, extending from the suture to 

 near the base of the beak on the body volution, and from suture to suture 

 on the others, even on the casts ; surface of the shell marked by very fine 

 transverse striae parallel to the folds, which are only slightly directed for- 

 ward in their lower part; and by extremely faint indications of faint thread- 

 like, raised, spiral lines, divided by broad flattened interspaces. 



The specimens upon which this species is founded are partially casts, 

 with the shell preserved on a portion of the body volution of one of them. 

 Its substance is very thick and the vertical folds sharply angular. The 

 species bears a very close resemblence to (7. Mullicaensis herein described, 

 but the shell is larger and has a more elevated spire, while the body whorl 

 is larger in proportion, the spire more slender, and the sutures much more 

 distinct. The surface characters are much the same in both. There may 

 be some question as to the proper generic reference of the species C. Mul- 

 iicaensis, but the specimens are in such a condition of preservation that it 

 is impossible to tell just what they are. Stoliczka, in the Pal. Indica, refers 

 very similar forms to Vohitilithes Swains., and others, just as similar, to 

 Lyria Gray, but it does not seem to me that they are as nearly related to 



