THE NAUTILUS. Ill 



LIMACIDJB, Limax only. 



EXDODONTID,*:, Pyramiditln (alternata, perspectiva, etc.), Punc- 

 turn. 



ARIONIDJE, Arion (imported), Ariolima.r, Prophi/saon, Hemp Ml- 

 Ha and their immediate allies. 



PHILOMYCIDJE, Philomycu* (Tebennophorus), Pallifera. 

 The systematic position of the Selenitiilce, with a revised catalogue 

 of the species and varieties, will be considered in a future article. 



ON SOME NEW SPECIES OF SCALA. 



BY \V. H. DALL. 



Scala (Sthenorhytis) Mazyokii Dull. 



Shell solid, stout, rapidly enlarging, with (on the last whorl six) 

 stout rather carinate varices which increase in size successively, the 

 last being very heavy, its anterior face sloping backward from the 

 nearly circular aperture; outer margin of the varix even, rounded, 

 slightly winged on the axial side ; whorls smooth except for a single 

 faint revolving rib encircling the base at about the level of the top 

 of the aperture of the succeeding whorl ; specimen decollate, prob- 

 ably with four or five whorls when complete, the spire probably 

 short and acute. Height 31 -5, diameter 28 mm. in the decollate 

 shell. 



Miocene, Cainhoy, South Carolina, W. G. Mazyck. 



This fine species differs from S. pernobilis, S. Stearnsii and others 

 of the group by its small number of distant rapidly enlarging 

 varices. The type is in the collection of Mr. W. G. Mazyck, of 

 Charleston, who collected it, and to whom it is respectfully dedicated. 

 Soala ranellina Dull. 



Shell of five or more whorls, rather rapidly increasing, spirally 

 ribbed with ten or twelve rather feeble flattish ridges which are ob- 

 solete or absent above the shoulder ; basal area projecting, strongly 

 marked, overrun by the varices which are angulated and prominent 

 over the keel ; varices of two sorts, one set large, thin, wide set at 

 the half whorl, continuous up the spire on each side like the varices 

 of Ranella pulchra, their profiles rounded, the aperture circular, 



