340 
Aug. F. Foerste 
It is 60 mm. long, nearly cylindrical in form, 24 mm. wide, and has 
5 cameras in a length of 40 mm. The oblique annulations, indicating 
lines of contact with the septa, form angles of 70 degrees with the 
longitudinal axis of the specimen. 
A third specimen, numbered 401 in the James collection, 
found at Harman station in Indiana, and also labelled Colpoceras 
arcuatum, also differs from the type in being nearly cylindrical. It 
is 160 mm. long, 35 mm. wide at midlength, ten cameras occupy a 
length of 93 mm., and the lines of junction with the septa form angles 
of about 80 degrees with the longitudinal axis of the specimen. 
48. Caliculospongia pauper, gen. et sp. nov. 
(Plate VI, Figs. 9 A, B, C) 
Sponge small and short (13 mm. wide; 21 mm. long), with shal- 
low cloacal cup (7 mm. wide and 3 mm. deep) and with relatively thick 
walls. Base apparently with short, blunt, subradiciform angula- 
tions. Entire sponge perforated by numerous tubular canals, about 
a quarter of a millimeter in diameter. Within the cup the canal 
openings tend toward arrangement in lines, chiefly horizontally, 
about 3 or 4 openings in a distance of 2 millimeters. On the exterior 
of the sponge no tendency toward linear arrangement is noticed. 
Under a lens, the surface of the sponge appears dense, and no 
spicular or fibrous structure is seen. The sponge material often is 
slightly raised along the margin of the canal openings. The canals 
often approach the surface very obliquely, and the surface of the 
sponge, therefore, appears marked by tortuous channels and inter- 
mediate ridges. The path of the canals, from the interior of the 
sponge toward its exterior, also is very irregular. 
Found in the Millersburg member of the Cynthiana formation, 
along the Belt line of railroad, opposite the Magoffin estate, in the 
northeastern part of Lexington, Kentucky. 
49. Carney ella and Isorophus, gen. nov. 
Among the Ordovician species usually referred to the Devonian 
genus Agelacrinites it is possible to distinguish several groups, 
for two of which the terms Carneyella and Isorophus are here pro- 
posed. The type of Carneyella is Agelacrinus pileus, Hall, from the 
Maysville formation of Ohio, Indiana, and Kentucky, The type of 
Isorophus is Agelacrinus cincinnatiensis^ Roemer, from the same 
