104 THE AMERICAN MONTHLY [May 
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JQ 99 9 
Foot short; toes minute; face sub-prone; beak 
small, tubercular suilla. Sup 
Foot long, slender; toes long; front rounded ; beak or 
WOO OME Sed dA cl ala sak aa) SE RRAR SE clastopis 
38. DISTHEMMA. II., 54. Sup. 31. 
Body gibbous, slender; foot long, toes minute ww... 
Body gibbous behind, long, changeable. Marine... 
Body cylindric, long; toes % entire length 2.000000... Collinsii 
Body cylindricconical; toes recurved, base toothed.forficula. Sup 
Body sub-fusiform; eyes 2, colorless, occipital ; 
toes ‘slightly décurved joo eo platyceps. Sup 
39. Masticocerca. II., 59. Sup, 35. 
Lorica with 2 longitudinal ridges, (a) 
Lorica with 1 longitudinal ridge, (b) 
Lorica not ridged, (f) 
Ridges sub-parallel, nearly as long as lorica 
.bicristata. Sup 
Ridges diverging anteriorly, about % lorica-length...... mucosa* 
Ridges diverging anteriorly, equaling lorica-length; a 
thorn before each lateral antenna. spinigerat 
| Lorica without frontal spines, (c) 
Lorica with 3 frontal spimes (ooo) us i eee scipio 
Lorica with 5 frontal spines 0.0... _.cornuta 
Toe longer than lorica, (d) 
Toe shorter than lorica, (e) 
Toe as long as lorica; basal styles 2, minute... elongata 
Ridge as long as lorica; 2 postero-dorsal spines... bicuspest 
Ridge % lorica-length RESON: DERN ARRINMSE bata 2 carinata 
Ridge 24 lorica-lengtB oi rattus 
Snb-stvles 2; uneqasl ooo ee lophoessa 
Sub-styles (under pressure) 3, unequal oo. iernis. Sup. 
Lorica without frontal spines (g) 
Lorica with 1stout, tooth-like, frontal spine ; necked..multicrinis§ 
Lorica with 2 unequal frontal spines; toe-base bulbous, 
gub-stylés eaiale ok i er a bicornis 
Toes more than % length of broadly ovate body; sub-styles 3. lata || 
Toe % length of fusiform body; sub-styles present......._... macera 
Toes less than % body-length; sub-styles none _...0.... stylata 
40. Ratroyuus. II., 64. 
Sub-styles present, (b) 
Sub-styles none; probably visible under pressure, (c) 
Sub-styles 4; toes long, unequal... trigis 
*Stokes. Ann. & Mag. Nat. Hist., 1896,17. +Ib.,1897,631. + Pell. 
Microscope, 1890,143. § Kellicott. Trans. Am. Micros. Soc. , 1897, 51. 
| Jennings. Bull. Mich. Fish. Com., 1894, 19. 
