24 
BULLETIN OF THE LABORATORIES 
The very convex and broad form with numerous obtuse or rounded 
plicae and the flexture at the front all suggest that species. 
HEMIPRONITES CRENISTRIA. 
The variation seen in this species is extreme and it will not be at- 
tempted to carefully illustrate these. Plate II, Fig. i, illustrates the 
typical variety at seventy to one hundred feet below conglomerate I. 
Plate III, Fig. 12, displays the characters of the rounded form en- 
countered above conglomerate II, where it is associated with a deltoid 
form even larger than that figured. In the shales sharper striations are 
preserved. Fig. 5, of Plate IP illustrates the appearance of the young 
as seen at Moot’s run. 
4Jj 
TREBRATULA (?) INCONSTANS, Sp. n. (Cf. T. LINCKL/EI, H.) 
(Plate XI, Fig. 18 ; Plate III, Figs. 8, 9.) 
Shell sub-ovate, broadest below the middle, length less than one 
and three-fourths the breadth, moderately gibbous, thickness greatest 
considerably above the middle, lower outline generally distinctly trun- 
cate. 
Ventral valve gently arched until near the beak where more rap- 
, idly curved, greatest width at the hinge margins at nearly one-half the 
height. 
Dorsal valve less arched, most prominent a short distance below 
the beak, surface with greatest convexity along medium line and curv- 
ing gently to the sides, angle of beak about 112°, shell punctate, cast 
with radiating ridges, shell marked by concentric lines of growth. 
Length of small, perfect specimen, 10 mm., width, 8.5 mm., thick- 
ness, 5.5 mm. Largest specimen seen, length 31 mm., width, 24 mm. 
ATHYRIS ASHLANDENSIS, Sp. n. 
(Plate III, Fig. 6.) 
Closely resembling in ascertainable characters A spirife 7 vides from 
the Hamilton, but differing in that the mesial -s-inus- of the dorsal valve 
is less abruptly elevated at the front. Width of dorsal valve, 43 mm. , 
height, 32 mm. Several valves in a more or less imperfect condition 
have been collected at Moot’s run and in Ashland Co. 
