ROTATORIA OP THE UNITED STATES. 
91 
Family 15. CATHYPNADJE. 
Owing to the large number of species of this family, and the confusion and obscurity in regard 
to their determination, I have wherever possible introduced a figure of the species found in Lake Erie, 
in order that the animal may be identified without regard to considerations of nomenclature. 
CATHYPNA Gosse. 
67 C luna Gosse. (Plate 19, figs. 28 and 29.) 
Abundant in bottom vegetation of Lake Erie near the shore, in the region of South Bass Island. 
Shiawassee River at Corunna, Mich. (Ivellicott, ’88). Lake St. Clair and the following inland lakes 
of Michigan: McLaren Lake, Oceana County; Crooked Lake, Newaygo County; Chippewa Lake, 
Mecosta County (Jennings, ’94). Old Channel and West Twin Lake near Charlevoix, Mich. (Jennings, 
’96) Sandusky Bay, Lake Erie (Kellicott, ’96). Waters connected with the Illinois River at Havana, 
111. (Hempel, ’98). 
68. C leontina Turner. (Plate 19, fig. 25.) 
In Chara from East Harbor, Lake Erie, and East Swamp, South Bass Island. 
This species was recently redescribed by Stokes (’97) as C. scutaria and by Daday (’98) as C. macro- 
dactyia. The identification of C. leontina Turner with Disty la icthyo ura Anderson and Shephard (’92) 
(Cathypna appendiculata Levander, ’94), as proposed by Rousselet (’97, p. 12) and Stenroos (’98, p. 162), 
seems to me impossible. I believe that a comparison of fig. 25 of C. leontina with the figures given by 
the above-named authors makes this at once evident. Cathypna leontina is broad and short (a true 
Cathypna), with immensely long, slender toes, and with the lorica ending in a short plate which projects 
backward at the angles into two large points with a concavity between them. Distyla icthyoura, on 
the other hand, is slender (a true Distyla), the toes are short, and the posterior projection of the lorica 
is much broader at the distal end and is there squarely truncate. 
Near Cincinnati, Ohio (Turner, ’92). Lake St.Clair (Jennings, ’94). Sandusky Bay, Lake Erie 
(Kellicott, ’97). Trenton, N. J. (Stokes, ’97, under the name C. scutaria). Waters connected with the 
Illinois River at Havana, 111. (Hempel, ’98). 
69. C. ungulata Gosse. (Plate 19, figs. 26 and 27.) 
Common among aquatic plants of East Harbor, Lake Erie, and Portage River, Ohio; also in East 
Swamp, South Bass Island. 
This is the largest of the Cathypuadie, measuring 310/( in length, including the toes. It is one of 
the commonest of the Rotifera in the Great Lakes. This species has recently been redescribed by 
Stokes (’97) as C. glandulosa n. sp., and by Stenroos (’98) as C. magna n. sp. The variety tenuior of 
Stenroos was common in Lake Erie among the type specimens. 
Minnesota ^figured by Herrick, ’84, plate v, fig. 5, without a name). Lake St. Clair (Jen- 
nings, ’94). Trenton, N. J. (Stokes, ’97, under the name C. glandulosa n. sp.). 
C. scutaria Stokes (’97) = C. leontina Turner. 
C glandulosa Stokes ('97) =C. ungulata Gosse. 
DISTYLA Eckstein. 
70. D. ohioensis Herrick (’85). (Plate 20, fig. 30.) 
East Harbor, Lake Erie, and East Swamp, South Bass Island. 
This species resembles iu many respects D. icthyoura Anderson and She phard (’92), ( Cathypna appen- 
diculata Levander, ’94). But it differs from that in the fact that the posterior projection of the lorica 
is not broader at the end, so as to make it “fish-tailed,” and iu the presence of the facets on the dorsal 
surface. Herrick’s description and figure of D. ohioensis are exceedingly poor, yet his account differs 
from those of the above-named authors in exactly the points just mentioned. Herrick's name is 
therefore accepted for this species. All distinctive features are shown in the figure. 
Ohio (Herrick, ’85). Near Cincinnati, Ohio (Turner, ’92). Lake St. Clair and Crooked Lake, 
Newaygo County, Mich. (Jennings, ’94). Sandusky Bay, Lake Erie (Kellicott, ’96). Waters con- 
nected with the Illinois River at Havana, 111. (Hempel, ’98). 
71. D. gissensis Eckstein (’83). (Plate 20, figs. 33 and 34.) 
Swamp near fish-hatchery on South Bass Island. 
Waters connected with the Illinois River at Havana, 111. (Hempel, ’98). 
