1887.] MICROSCOPICAL JOURNAL. 127 
6. Lumbar spine long; frontal spines none. . . . macracantha. 
c. Lumbar spine short, conical, arched; frontal none . . . . ewstala. 
d. Lumbar spine short, its base widened ; inontalespines 2y\uu  Suzicaza. 
48. Diprois. 
Dorsal cleft wide before, closed behind ; posterior ventral spines 3, 
propatula. 
Dorsal cleft open throughout, narrow; ventral spines none . . Davéesia@. 
49. EucuHLanis. 
§ Lorica oval, long, narrow; hind dorsal edge not notched . . . dyra. 
- § Lorica ovate or broadly oval; not constricted (a). 
§ Lorica centrally constricted; toes rod-shaped . . . pyriformts. 
a. Dorsal front edge with a ‘browd gap; uncus 5- “oadned s dye Meelatacoe 
a. Dorsal front edge with a broad gap; uncas 7-toothed . . . macrura. 
a. Dorsal front edge notched; ventral plate concave . . . . ¢triéquetra. 
a. Dorsal front edge notched; ventral plate membranous . . . deflexa. 
50. CATHYPNA 
imomearsuttace tinted, front edge straight - ... 2. =: . .  suleata: 
Lorica surface coarsely tesselated, front opening narrow . . . vrusticula. 
moatieasssiitace smooth, front edge crescentie “So ° 2) . 0 0 anes 
Ca teo 9 Daisitvady.\ 
iorica ilexible, plicate, nearly parallel-sided . . .) . ©. . flexcles: 
oriea rigid, round behind, front truncate . . - . . . +. Géssensis. 
52. Monostyta. 
Front deeply cleft, with 2 curved horn-like spines . . . gwadridentata. 
Front deeply excavate between 2 triangular flat points . . . . dunarts. 
Front shallow concave; no distinct shoulder to claw . . . . cornuta. 
Front with deep, narrow sinus between 2 obtuse points . . . . dalla. 
Front excavation forming 3 sides of a square; lorica tesselated. . Lordzz. 
53. CoLurus. 
§ Marine (a). 
§ Fresh water (6). 
a. Toe single, long, with a median depression . . . . . amblytelus. 
Gan Loe double, formed of 2 narrow, superposed plates . . . ce@lopinus. 
gs Toes 2, large, tcl curved: 2.1 Sey eit Boll SR AB MGT OL asi 
a. Toes 2, minute, straight hill EN ed ral el eae. DECCL I Se 
6. Hind ea with 2 Henle spines, sinus deep, pvade Cette eats NE ILEN eS 
6. Hind end with 2 blunt, short spines; front truncate . . . wmctnatus. 
6. Hind end with two very short points; lorica pyriform . . caudatus. 
Peetindvend excavate, mot cleft =... i. «4 slave s1 5)  OtCUSPLatus. 
feebionid end rounded. without points; 6) Fic sew a: 's 9,» ODLUSUS: 
54. MEropipia. 
a. Lorica subcircular, with 1 dorsal 2 lateral wings . . . . éréptera. 
a. Lorica subcircular, without wings . Pe OE. 
6. Lorica oval, with 2 small postero- Hepat projections Ne de bractea. 
6. Lorica oval, without posterior projections . . . . lepadella. 
c. Lorica ovate, tesselated, with a dorsal longitudinal ridge . oxysternum. 
c. Lorica ovate, not tesselated, acutely pointed behind, front 2-pointed, 
acuminata. 
Lorica rhombic-ovate, obtusely pointed behind . . . . rhomboides. 
= 
