92 
(.07); diameter of cell-mouths .64 mm. (.015.) Resembles A. 
eonglomerata Goldf., but more consolidated. 
Aulopora cyclopora. —Tubes rather long, arranged in 
single linear series which branch without anastomosing; cell- 
mouths oblique, not elevated. Length of tubes 2.29 mm. (.09) 
to 3.56 mm. (.14) ; diameter of cell-mouths 1 mm. (.04). 
Tentaculites subtilis. —Minute, extremely slender, very 
gradually tapering; rings regular, rounded. In a terminal 
fragment 3.81 mm. (.15) long, the whole number of rings is 40; 
mean distance apart on apical third .064 mm. (.0025). Longest 
specimen 12.7 mm. 
Fe^estella eximia. —Rays angulated along the middle, 
bearing two rows of pores with salient margins, opening ob¬ 
liquely ; 23 pores in the distance of ten fenestrules. Length 
of fenestrules .51 mm. (.02); breadth .37 mm. (.015.) This 
species and one similar to the preceding occur at New Buffalo, 
Iowa. 
Fenestella filitexta. — Rays extremely delicate, ob¬ 
tusely carinated; fenestrules comparatively large and cells 
remote. Non-celluliferous side minutely striate. Length of 
fenestrules 2.03 mm. (.08) ; breadth .76 mm. (.03)'; diameter 
of ray .25 mm. (.01) ; distance of cells .18 mm. (.007) ; longer 
diameter of cells .08 mm. (.003). 
Stictopora sulcata. —Small, compressed, solid, ancipital, 
dichotomous stems, celluliferous on both sides; cells oval, with 
salient lips, arranged in 6-9 longitudinal series separated by 
prominent rigid striae (in one variety little developed). Greater 
diameter of stem 2.29 mm. (.09) ; less diameter .89 mm. (.035) ; 
distance between cells .2 mm. (.009) ; greater diameter of cells 
.15 mm. (.006) ; less diameter .1 mm. (.004.) Seven cells in 
2.5 mm. (1). 
Crania radicals. —Attached valve very irregular, with 
distinct cardinal truncation, always presenting the appearance 
of area, triangular fissure and cardinal processes ; central por¬ 
tion of valve often absorbed or wanting, leaving only the up¬ 
turned border. Exterior furnished with radiciform, flexuous 
often bifurcate, hollow spines or appendages, sometimes as 
long as the shell. Diameter about 3.8 mm. (.15). 
Crania (Pseudocrania) anomala. —Shell free or attached, 
irregular, thick; hinge line nearly equal to greatest width. 
Ventral valve with three or four pairs of muscular impressions, 
a broad, striated area, arched false deltidium nearly filling the 
very broad triangular fissure and fusing with cardinal processes 
to form a spoon-shaped orthidoid appendage. Exterior with 
many fine radial striae. Transverse diameter 28 mm. (1.1) ; 
length 20 mm. (.8). 
Chonetes Emmetensis. —Small, semicircular; hinge-line 
equal to greatest width, or slightly greater or less, armed with 
two short spines near each extremity, which turn out at right 
