ROTATORIA OF THE UNITED STATES. 
87 
42. D. biraphis Gosse. 
Swamp near fisli-hatcliery, South Bass Island. 
Lake St. Clair, and Chippewa Lake, Mecosta County, Mich. (Jennings, ’94). Waters connected 
with the Illinois River at Havana, 111. (Hempel, ’98). 
D.circinator Gosse. — Chippewa Lake, Mecosta County, Mich. (Jennings, ’94). 
D. caudata Ehrenberg. — McLaren Lake, Oceana County, Mich. (Jennings, ’94). 
D. contorta Stokes. — Trenton, N. J. (Stokes, ’97). 
Distemma forficula Ehrenberg. — Pond near Bangor, Me. (J. C. S., ’83). 
Suborder LORICATA. 
Family 11. RATTULIDiE. 
There is much confusion in regard to the identification of the species belonging to this family, so 
that I have thought it best to give figures of the species listed, so far as possible. The group is badly 
in need of a thorough revision. 
MASTIGOCERCA Ehrenberg. 
43. M. bicornis Ehrenberg. (Plate 17, fig. 15). 
East Harbor, Lake Erie. 
Pond near Bangor, Me. (,T. C. S., ’83). Lake St. Clair, and Chippewa Lake, Mecosta County, Mich. 
(Jennings, ’94). Round Lake, and Pine Lake. Charlevoix, Mich. (Jennings, ’96). Sandusky Bay, Lake 
Erie (Kellicott, ’96). Waters connected with the Illinois River at Havana, 111. (Hempel, ’98). Pools 
about Hanover, N. H. (H. S. J.). 
44. M. carinata Ehrenberg. (Plate 18, fig. 19.) 
East Harbor, Lake Erie; swamp near fish-hatchery on South Bass Island; Portage River, Ohio. 
Pond near Bangor, Me. (J. C. S., ’83). Shiawassee River, at Corunna, Mich. (Kellicott, ’88). 
Lake St. Clair and the following inland lakes of Michigan : West Twin Lake, Muskegon County; 
Crooked Lake, Newaygo .County, and Chippewa Lake, Mecosta County (Jennings, ’94). Lake 
Michigan, Round Lake, and Pine Lake, near Charlevoix, Mich. (Jennings, ’96). Sandusky Bay, Lake 
Erie (Kellicott, ’96). Waters connected with the Illinois River at Havana, 111. (Hempel, ’98). Common 
at Hanover, N. II. (H. S. J.). 
45. M. elongata Gosse. (Plate 17, fig. 16.) 
In Utricularia from Portage River, Ohio. 
Sandusky Bay, Lake Erie (Kellicott, ’97). Waters connected with the Illinois River at Havana, 
111. (Hempel, ’98). Pools, Hanover, N. H. (H. S. J.). 
46. M. bicuspes Pell. (Plate 16, figs. 11 and 12.) 
Iu Utricularia from East Harbor, Lake Erie. 
This form has recently been redescribed by Stokes (’97) as M. spinigera n. sp. As the description 
and figure of Pell (’90) seem not well known, I give figures of dorsal and lateral views. Like M. lata, 
this species has five sensory projections on the corona, as shown in the figures. 
Highland Falls, N. Y. ? (Pell, '90, locality not stated). Trenton, N. J. (Stokes, ’97, under name 
M. spinigera n. sp.). 
47. M. mucosa Stokes. (Plate 17, fig. 18.) 
One of the most abundant of the Rotifera among the vegetation of the shallow parts of Lake 
Erie about South Bass Island. 
This is the two-keeled species mentioned without identification in my first paper on the Rotifera 
(’94), as being abundant in various lakes ; it has since been described by Stokes under the above name. 
It differs from M. bicristata Gosse (fig. 17) in its shorter thicker body, and in the fact that the two 
keels extend only about one-half the length of the body. Lake St. Clair, Chippewa Lake, Mecosta 
County, Mich., and Crooked Lake, Newaygo County, Mich. (Jennings, ’94, as “form with two large 
dorsal keels”). Round Lake and Old Channel, Charlevoix, Mich. (Jennings, ’96, unnamed, p. 91). 
Trenton, N. J. (Stokes, ’96 b). Pond, Hanover, N. H. (H. S. J.). 
M. bicristata Gosse. (Plate 17, fig. 17.) West Twin Lake near Charlevoix, Mich. (Jennings, ’96) ; 
Sandusky Bay, Lake Erie (Kellicott, ’97 ; possibly this was M. mucosa Stokes). Waters connected with 
the Illinois River near Havana, 111. (Hempel, ’98). 
M. capucina Wierz. and Zach. — Lake St. Clair (Jennings, ’94). West Twin Lake near Charlevoix, 
Mich. (Jennings, ’96). 
