THE NAUTILUS. 111] 
Limacip®, Limax only. 
Enbovontip&, Pyramidula (alternata, perspectiva, etc.), Pune- 
tum. 
ARIONID#, Arion (imported), Ariolimax, Prophysaon, Hemp hil- 
hia and their immediate allies. 
Pattomycip&, Philomycus (Tebennophorus), Pallifera. 
The systematic position of the Selenitide, with a revised catalogue 
of the species and varieties, will be considered in a future article. 
ON SOME NEW SPECIES OF SCALA. 
BY W. H. DALL. 
Scala (Sthenorhytis) Mazyckii Dall. 
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. 
Scala ranellina Dall. 
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, 
