240 



TBOCHELMINTHES 



1. Brachionus Pallas. Lorica arched dorsally, flattened ventrally; 

 1 red eye: numerous species, some marine. 



B. rubens Ehrenberg (Fig. 387). Six straight spines on anterior 

 margin; no posterior spines; color pinkish: often common. 



B. bakeri 0. F. Miiller. Six spines on anterior margin, the 2 

 middle ones curving outward; 2 lateral spines on posterior margin may 

 be long, short, or absent; length .25 mm.: often very common. 



Fig. 386 



Fig. 387 



Fig. 388 



Fig. 386 — Pterodina patina (Siissw. F. Deut.). Fig. 387 — Brachionus ruhens (Siissw. 

 F. Deut). Fig. 388 — Noteus quadricornis (Siissw. F. Deut.). 



B. militaris Ehr. Foot jointed; lorica with 10 anterior and 4 pos- 

 terior spines, its surface facetted and covered with raised points; 

 length .25 mm. 



2. NoTETJS Ehrenberg. Foot jointed; lorica oval and with 2 ante- 

 rior and 2 posterior spines ; no eye : 1 species. 



N. quadricornis Ehr. (Fig. .388). Dorsal surface facetted, whole 

 surface roughened; length .35 mm. 



Family 4. DINOCHARIDAE. 



Lorica more or less cylindrical and usually with an 

 anterior dorsal projection over the head; foot very long 

 with 2 long toes: 4 genera. 



1. ScARlDiUM Ehrenberg. Lorica vase-shaped, smooth, 

 and transparent, without the dorsal projection; 1 eye; 

 foot and toes very long: several species. 



S. longicaudum (0. F. Miiller) (Fig. 389). Body 

 cylindrical ; toes and foot longer than the rest of the 

 body; .4 mm. long. 



2. Stephanops Ehrenberg. Head covered with a large 

 semicircular shield; foot and toes not usually long; 1 to 3 

 long movable spines project from the back : several species. 



S. longispinatus Tatem. One long spine from the middle of back; 

 length .15 mm. 



Fig. 389 



Scaridium 



lonoicaudum 



(Siissw. F. 



Deut.). 



