1915.] NATURAL SCIENCES OF PHILADELPHIA. 309 
(3) Three lamelle, superior, axial and basal. 4 specimens = 20%. 
Length 13.9, diam. 3.7 mm.; whorls 153 
ag lis ce 4 c 73 14. 
Station 1, northern and eastern sides of Teocalli Butte, at the 
base of the cliff. Types Nos. 112,265, A. N.S. P. 
Twenty shells opened out of a series of over 250 show that the 
bilamellate form predominates. The largest shell noticed is 14.9 
mm. long, the smallest 11.56 mm. There is rather wide variation in 
sculpture, but a large majority of the shells conform to fig. 3a in 
this respect. 
Holospira bilamellata insolata n. subsp. Plate VII, figs. 4 to 4a. 
The shell is slender, with a rather long terminal cone; very strongly 
ribbed throughout; composed of many (133 to 175) short, convex 
whorls, the last very shortly free in front. Peristome narrow, only 
very slightly expanded. Only the axial lamella developed in 14 
out of 16 individuals opened, the other two having axial and basal 
lamelle. 
Length 15.5, diam. 3.6 mm.; whorls 175 
(73 15, iz 3.8 a3 a3 i 53 
cr elle LS SS Digicom ere ty 
ee DEEN Lee of bs) Voi =~ 165 
cc 14.5, “cc 3.6 ce “cc 153 
73 14, cc 3.8 a3 cc 153 
(73 13.5, iz 3.8 iad (79 15 
“ 13, cc B37) “cc “ 143 
iz 13, ec 3.3 ec (a9 153 
wy) pe 2220 ami 9 pega ke: 
73 12. a3 3.9 a3 a3 133 
Fn Cal sce Ra eS ‘‘ 134 (axial and basal lamelle). 
Station 6, on the southeastern slope of the mountain south of 
Big Hachet Mt. 
This form differs from crossei and mearnst by the more slender 
shape, long terminal cone, more numerous whorls and strong sculp- 
ture. It agrees with bilamellata in having many whorls, but differs 
by its slender form, longer cone, the prevalence of unilamellate 
shells, etc. H. b. heliophila stands nearest to insolata, but in that 
race the bilamellate form predominates. It is more conspicuously 
ribbed than any of the other Hacheta races. 
Holospira bilamellata media n. subsp. Plate VII, figs. 5 to 5c. 
The shell is cylindric with a long terminal cone; composed of many 
closely coiled, convex whorls, all after the embryo rather strongly, 
