126 THE AMERICAN MONTHLY [July 
6. Stylets ey minute; toe longer than body and head . . . . rattus. 
c. Stylets ,, toe length ; Boe, as long as:lorica \*y .)ai).) 9." elomemmen 
c. Stylets 4 i toe length : toe 2 body ‘length ARMM A002) 08 255°. - 
c. Stylets + toe length ; ; toe $ body mac Oy 
d. Lorica front with 3 goinies nti Pe EC 2; 
ad; Worica front smooth=edged a9 V2 eee 
40. RATTULUS. 
a. Brain clear; face with pendent fleshy lobes; marine . . . calyptus. 
a. Brain clear; toes with 2 pairs very short basal stylets . . . degrzs. 
a. Brain clear; toes without basal stylets . . . . . helminthodes. 
6. Brain semi-opaque ; toes equal, decurved, set wide apart . sejsunctipes. 
c. Brain opaque; toes short, blade-like, decurved - (2 » 0 ei) peaegiaaaizgem 
41. Ca@LoPus. 
§ Lorica ridged; head with 2 spies . . - . «= page 
§ Lorica not ridged (@). 
a. Head with 2 or 3 points; toe with 2 stylets . . . . - =) lzemaaome 
a. Head not spinous (6). 
6. Body cylindric, short, plump, decurved . . . . brachyurus. 
6. Body shoes aes elevated, protruding behind the foot . 4 ee OMe 
6. Body rotund, =i, inch long; eyes 2, ‘wide apart . |. |< “W9eagemigee 
42. DINocHaRISs. 
Lorica subquadrangular, edges serrated, dorsal spines8 . . . Codlinsiz. 
Lorica vasiform, subcylindrical, a short spine between the toes . foczllum. 
Lorica vasiform, narrowing behind, no spine between the toes . ¢etractzs. 
43. SCARIDIUM. 
Toes equal to the body length; lorica pyriform . . . . eaudactylotum. 
Toes, foot and elongate body about co-equal . . . . . Jlongicaudum. 
44. STEPHANOPS. 
Lorica pyriform, posterior spines 3 ; foot with toe- like spine . lamellaris. 
Lorica cylindrical, neck thick, constricted; no spine on foot .  . mutzcus: 
Lorica cylindrical, not constricted, 3 points behind; toe single. chlena. 
Lorica ovate, dorsal spine, long, straight ; toeS 2. . . \o . weesecarmsre 
45. Diascniza. 
§ Dorsal cleft narrow, the edges parallel (a). 
§ Dorsal cleft closed in front, gaping behind (8). 
§ Dorsal cleft wide throughout (c). 
a. Body gibbous and widest behind; toes decurved . . : . . Hoodz. 
a. Body gibbous and widest behind; toes thick conical. . . . exegua. 
a. Body widest in front; toes decurved, two-thirds body length . valga, 
é. Toes long, slender, recurved’ \..%, 2) a) 9 3 eee 
6. Toes blade-like; recurved . . Sn Ee peta. 
c. Toes thick, nearly straight, obtuse 2 oan eae ceo oc, i eam 
46. DipLax. 
Lorica lateral outline a parallelogram. © 8) oe se COTE mga 
Lorica lateral outline ovate; in section triangular PE 8) 907 
47. SALPINA. 
a. Lumbar spine short; frontal spines 2, procurved . . . mucronata. 
a. Lumbar spine short; frontal spines nome’... . -)\ 6) \-ysGnecaspaaae 
6. Lumbar spine long, acute; frontal spines 2 Lk nil SNCs ge aoa 
