EOTIFEEA 239 



SUBORDER 2. LORI CAT A. 



Lorica present, usually much flattened: 12 families. 

 Key to the families of Loricata here described: 



! Foot absent 1. ANUILEIDAE 



o 2 Foot present. 



61 Foot transversely wrinkled or ringed (not jointed). 



G! Foot ending in a ciliated cup, without toes 2. PTERODINIDAE 



c 2 Foot ending in 2 toes 3. BRACHIONIDAE 



6 2 Foot not wrinkled or ringed, often jointed, with 1 or 2 toes. 

 Cj Toes not long and spine-like. 



di Foot jointed ; lorica without dorsal spines 3. BRACHIONIDAE 



d 2 Head with a chitinous covering like the visor of a cap ; foot and toes 



often very long ; 1 eye 4. DINOCHARIDAE 



C 2 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. 



Cj Toes very slender and bristle-like, often very long 5. RATTULIDAE 



e a Toes 1 or 2 in number, slender and rod-shaped 6. CATHYPNIDAE 



e 3 Toes 2 in number, long and diverging 7. ETJCHLANIDAE 



d 2 An arched shield over head 8. COLUBIDAE 



FAMILY 1. ANUE^EIDAE. 



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

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



ANTTR2EA 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 wanting; length 

 .16 mm. 



A. aculeata Ehr. (Fig. 385). Lorica quadrangular 

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

 long. Deut '>- 



FAMILY 2. PTEBODINIDAE. 



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. 386). Lorica very transparent, flat and cir- 

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



FAMILY 3. BEACHIONIDAE. 



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. 



