ROTIFERA 239 



Suborder 2. LORICATA. 



Lorica present, usually much flattened: 12 families. 



Key to the families of Loricata here described: 



Oi Foot absent 1. Anub^idae 



C2 Foot present. 

 6i Foot transversely wrinkled or ringed (not jointed). 



Cj Foot ending in a ciliated cup, without toes 2. Pterodinidae 



Cj Foot ending in 2 toes 3. Brachionidae 



62 Foot not wrinkled or ringed, often jointed, with 1 or 2 toes. 

 Ci Toes not long and spine-like. 



di Foot jointed ; lorica without dorsal spines 3. Brachionidae 



dz Head with a chitinous covering like the visor of a cap ; foot and toes 



often very long ; 1 eye 4. Dinocharidae 



c'a Foot usually very short and ending in 1 or 2 slender and usually long 

 toes ; lorica usually flattened and ovate. 

 di No arched shield over head. 



61 Toes very slender and bristle-like, often very long 5. Rattulidae 



63 Toes 1 or 2 in number, slender and rod-shaped 6. Cathypnidae 



63 Toes 2 in number, long and diverging 7. Euchlanidae 



do An arched shield over head 8. Coluridae 



Family 1. ANUR^IDAE. 



Foot absent; lorica usually with 6 long spine-like projections at its 

 anterior margin and 1 or 2 at its posterior : 3 genera. 



Anur-EA Ehrenberg. Lorica thick walled and opaque, 

 marked with polygonal areas on its dorsal surface; empty 

 loricas frequently found: 7 species. 



A. cochlearis Gosse. Lorica prolonged posteriorly into 

 a long spine, which, however, may be ^vanting; length 

 .16 mm. 



A. aculeata Ehr. (Fig. 385). Lorica quadrangular An'urwa 



with a spine at each of the postero-lateral angles; .15 mm. (Siissw. F. 

 , Deut.). 



long. 



Family 2. PTERODINIDAE. 



Foot cylindrical and transversely wrinkled or annulated; body very 

 retractile: 2 genera. 



Pterodina Ehrenberg. Lorica flattened; a pair of lateral semi- 

 circles of cilia on the corona; 2 eyes; foot ending in a ciliated cup: 3 

 species. 



P. patina Ehr. (Fig. 380). Lorica very transparent, flat and cir- 

 cular and .17 mm. long, without teeth : common among algae. 



Family 3. BRACHIONIDAE. 

 Foot long, cylindrical, and usually not jointed, but annulated or 

 wrinkled, with 2 toes; lorica squarish and flattened and usually with 

 spine-like projections from its anterior margin: 3 genera. 



