1905.] NATURAL SCIENCES OF PHILADELPHIA. 215 
Species. Lamelle present. 
H. ferrissi: axial, parietal, basal. 
H., arizonensis: axial, ARISTA bon) tiie sexe! 
H. bilamellata: Bela pc tere So basal. 
H. mearnsi: CT EE ae oe 
In H. crossei the axial lamella is so weak as to be readily overlooked. 
Part of the species of this group have the terminal cone short, others 
having it very long; H. crosse: being somewhat intermediate. Other- 
wise they are very similar externally. They may be grouped thus: 
Cone of the spire short, rapidly tapering. 
Three internal Jamellea) ... ferrisst....cci.isicecc.sc00s0t Ribbed throughout. 
Two internal lamelle ...... CT UZOMCWSUS sachs, su dies Median whorls 
CT OSSCR ete tia) t smoothish. 
CLO Oe Goat ccicca ] 
| 
; Spire slowly tapering. 
ame a TCOPR SY alatz tee Ribbed throughout. 
GOUTUS GRA NN acl ht 
chiricahuana.............+ 
WCORMCMEU Gere csannccacRetons Median whorls 
smoothish. 
Fig. 1.—Holospira goldfusst. 2.—H. ferrissi. 3.—H. cionella. 
4.—H. chiricahuana. 
Holospira ferrissi n.sp. Pl. X XVII, figs. 22-25. 
The shell is rimate but imperforate, short and cylindric, rather thin, 
and very pale brownish-corneous. Whorls 94 to 11, the first whorl 
wider than the second, both of them smooth; all the rest of the whorls 
are regularly, evenly and closely rib-striate, the riblets as wide as their 
