1907.] NATURAL SCIENCES OF PHILADELPHIA. 93 



vesicles. Color, bright orange. Length, 2.0 mm. Habitat, Plymouth, 



iMiglanil. 



4. Dinophilus gigas. 



Wt'l.lon, lS8tJ.— Korsclielt, 1SS7.— Harmer, 18S9a.— Schimkewtsch, 1895.— 

 Scliultz, 1902. 



Head slightly wider than first trunk segment, ])earing one ciliated 

 band. Trunk segments seven. No circumanal band. Long sense 

 hairs in two symmetrical patches on the anterior surface of the head. 

 Color, a brilliant orange. Length, 0.75-2.0 mm. Habitat, Mounts 

 Bay, Penzance, England. 



5. Dinophilus gyrooiliatus. 



Schinitlt. lS.-,7.— DiesinK, 1S62.— Korsclielt, 1882.— Meyer, 1886.— Repia- 

 choff, 1880.- Korsclielt, 1887.— Harmer, 18S9a.— Schimkewitsch, 1895.— 

 Schultz, 1902. 



Head not wider than first trunk segment, bearing two complete 

 ciliated bands. Caudal appendage unsegmented. Two large sense 

 hairs on the anterior surface of the head symmetrically placed(?). 

 Colorless. Length, (?). Habitat, Naples, Italy. 



6. Dinophilus conklini n. sp. Pis. XII, XIII. 



Head not wider than first trunk segment, bearing two ciliated bands. 

 An imperfect circumanal band present. Caudal appendage unseg- 

 mented. Two symmetrically placed large sense hairs on the anterior 

 surface of the head, in addition to several smaller ones. Colorless. 

 Length, 0.50-1.0 mm. Habitat, aquaria, Philadelphia, Pa., U. S. A.; 

 New Jersey coast, U. S. A.(?). 



7. Dinophilus apatris. 



Korsclielt, 1882.- Repiachoff, 1SS6.— Harmer, 1889a.— Schimkewitsch 

 1895.— Prowazek, 1900.— Schultz, 1902.— Malsen, 1906. 



Head wider than any of the trunk segments, bearing two ciliated 

 bands. Head joined to trunk by a short piece having the appearance 

 of an imperfectly developed segment without the ciliated band. 

 Caudal appendage unsegmented. Four very large sense hairs on the 

 anterior surface of the head in two symmetrical pairs. Colorless. 

 Length, 1.2 mm. Habitat, aquaria, Freiburg (Korschelt) and Berlin 

 (Prowazek). Also found at Trieste, Austria (von Malsen). 



8. Dinophilus metameroides. 



Hallez, 1879.- Korschelt, 1882.- Graff, 1882.— Weldon, 1886.— Korschelt 

 1887.— Harmer, 1889.— vSchimkewitsch, 189.3.— Schultz, 1902. 



Head bearing two ciliated bands. Trinik segments sharply demar- 

 cated, the first much longer than the others. Caudal appendage 5-6 

 annulate with long papilliB. Mouth a longitudinal cleft. Color, red. 

 Length, (?). Habitat, Wimereaux, France. 



