coe: nemekteans of west and northwest coasts. 105 



e. Central stylet and basis of about equal length, f. 

 f. Cerebral sense organs in front of brain. 



1. Body shorthand broad; color dark purplish or 



chocolate brown above, with a triangular 

 white spot on each side of head; ventral sur- 

 face pinkish or flesh color ; 17 to 20 probos- 

 cidial nerves; basis of moderate proportions. 



^4. angiilatus, p. 238. 



2. Body ["rather broad and flat ; color whitish, 



thickly mottled with dark brown blotches 

 and dots on dorsal surface only ; basis bell- 

 shaped, broad and flattened posteriorly; 

 stylets slender ; 17 proboscidial nerves. 



A. nehulosus, p. 245. 



3. Body very slender ; 15 proboscidial nerves ; 



submuscular glands well developed ; intes- 

 tinal caecum short A. pauUnux, p. 253. 



4. Body of small size, of moderate proportions; 



color whitish, pale flesh-color, yellowish, 

 ochre or pale orange ; basis bell-shaped; 10 

 or 11 proboscidial nerves. 



A. Jlavescens,\). 277. 



5. Body very small and slender, whitish ; ocelli 



few, in four groups ; 1 to 3 accessory stylets 

 in each pouch ; 10 proboscidial nerves. 



^4. similis, p. 249. 



6. Body of small size, rather short and broad ; 



color reddish or orange, paler beneath ; 

 ocelli usually only 4 to 8 on each side of 

 head ; basis conical, stylets slender ; 10 to 

 12 proboscidial nerves. 



A. cali/urnicus, p. 264. 

 ff. Cerebral sense organs beside brain. 



1 . Body short and broad ; color reddish or 

 brownish above, pale beneath ; basis rather 

 slender, of ordinary shape ; 14 proboscidial 

 nerves ; cerebral sense organs very large. 



A. pacificus, p. 268. 

 ee. Central stylet about twice as long as basis. 



1. Body rather broad and flattened; color orange, 

 brownish or reddish above, with 2 large dark 

 brown or black elongated spots on head ; 

 ventral surface pale orange or flesh color ; 

 sometimes with 4 pouches of accessory sty- 



