Identification Keys 233 



39. Having the tube tuft small, sometimes minute, 



and lateral, far beyond pecten 40 



Having the tuft not small nor lateral, and sit- 

 uated immediately above and in line with pec- 

 ten, which extends about half-way up the 

 tube, the last being about twice as long as its 

 greatest width. Tufts A and B one-haired. 

 OcJilerotatus atlanticus. 



40. Tufts A and B two-haired. Antennae decidedly 



long and curved. Tube inflated. Pecten 



extending one-third, or less, up tube 41 



Tufts A and B one-haired. Antennae not 

 unusually long. (Rare species from the 

 extreme south.).... Grabhamia signipennis. 



41. Spines of tube four or five; one to three or 



more large and small teeth on one side of 

 them, sometimes one tooth on the other side ; 

 tube tuft very small, two-thirds distad, lateral. 

 Antennae decidedly arcuate. Tube very 



large. (Fig. 36, page 182.) 



JantJiinosoma posticata. 

 Spines of tube four to six, a tooth on each side of 

 the long central spine, the two secondary 

 teeth about equal. Tuft of tube small but not 

 minute, just above middle, not lateral. An- 

 tennae weakly sigmoid. (Fig. 50, page 247). 

 JantJiinosoma varipcs. 



42. Tufts A and B both represented by single 



hairs 43 



Tuft A or B represented by two or more 

 hairs 50 



43. Anal gills at least as long as chitin of 



ninth segment 44 



Anal gills not one-half as long as chitin of 

 ninth segment; tube tuft at middle, comb 

 teeth fringed at apex with spines of uniform 

 size OcJilerotatus onondagensis. 



