356 THE CHICAGO ACADEMY OF SCIENCES. 
Length. Breadth. Aperturelength. Breadth. 
28.50 12.00 14.00 6.50 mm. 
32.00 11.50 14.00 6.00 “ 
30.50 13.50 13.25 730° 
27.50 11.50 12.50 6.00 “ 
29.00 11.25 13.00 GOD 
25.50 10.00 11.50 600555 
23.00 9.00 9.50 ATS ae 
20.00 10.00 10.50 a | 
Types: Chicago Academy of Sciences, two specimens, No. 23622; 
cotypes, five specimens, No. 23624; coll. L. E. Daniels; Academy of 
Natural Sciences of Philadelphia; Smithsonian Institution; State 
Museum, Indianapolis. 
Tyre Locatity: Lake Maxinkuckee, Indiana. 
ANIMAL: Resembling reflexa in form; color ranging from horn 
color to jet black; usually light yellowish flecked with white all over. 
Jaw: Superior jaw wider than high, much arched, the inferior 
margin with a strong, acute median projection; the anterior angles of 
the lower margin form two triangular projections. The jaw 1s in all 
respects like that of palustris (See Pl. VI, fig. 1). 
RaApULA: (PI. IX, figs., B.C.) Formula: 74% +) 3*7-+3--4 +3 
4527+ 2% (28-1-28); central tooth as in reflexa; lateral teeth 
bicuspid, the mesocone very large, acute, the ectocone small and wide; 
intermediate teeth tricuspid, the entocone small and placed near the 
lower end of the mesocone; the eleventh tooth has the entocone and 
mesocone of equal length; marginals long and narrow, claw-shaped, 
the distal end with from three to five denticles of variable length; the 
first four or five marginals have one or two small cusps on the outer 
margin. In one membrane the tenth tooth (first intermediate) had a 
swelling in place of an entocone (pl. IX, fig. C). 
The transition from lateral to marginal teeth is very abrupt in 
danielsi, and the marginal teeth are very variable in the form and num- 
ber of the denticles. There are about 110 rows of teeth. 
GENITALIA: (PI. XIII, fig. C) Male Organs: Penis short and 
thick, 2.50 mill. long, with a rounded head; penis-sac large, 3.50 mill. 
in length; penis retractor (3.00 mill. long) and penis-sac retractor (2.00 
mill. long) flat, the latter inserted in penis-sac by about five small 
branches; protractor muscles seven in number, four posterior and 
three anterior, each bifurcated as it joins the penis-sac; vas deferens 
18.00 to 20.00 mill. long, rather thick; prostate duct about 6.00 mill. 
in length, slightly enlarging as it enters the prostate; prostate very 
large, flattened, elongated, squarely rounded proximally and gradually 
