298 ANNELIDA 



SUBORDER 5. SCOLECIFORMIA. 



Head without appendages (except in the Chlorhtsmidae) ; parapodia 

 poorly developed or absent; proboscis present but unarmed: 6 families. 

 Key to the families of Scoleciformia here described: 



! Head without appendages. 

 &! Segmentation equivalent ; body not made up of different regions. 



1. OPHETJIDAE 

 6 3 Segmentation not equivalent ; body made up of 2 or 3 more or less dis- 



tinct regions. 

 d Worms slender and withoufgills ........................ 2. MALDANIDAE 



c 2 Worms thick, with branching gills on the middle segments. .3. ARENICOLIDAE 

 o 2 Head with appendages ................................ 4. CHLOEH^EMIDAE 



FAMILY 1. OPHELIIDAE. 



Small burrowing worms which occur in shallow water; head with- 

 out appendages but with a proboscis; parapodia rudimentary, the dorsal 

 cirri of which are elongate and act as gills: about 6 genera. 



AMMOTRYPANE Rathke. Head conical and acute; 

 ventral side flattened: 1 species at Woods Hole. 



A. fimbriata Verrill (Fig. 471). Body elongate, being 

 thickest in advance of the middle and tapering to both 

 ends; color purplish; length 7.5 cm.; width 3 mm.: Vine- 

 yard Sound to Maine; in shallow water. 



FAMILY 2. MALDANIDAE. 



Slender, cylindrical worms which live in sand tubes; 

 Pig. 471 head formed of the fused prostomium and peristomium 



and usually obliquely truncated by a cephalic plate and 



without appendages; parapodia rudimentary, with setae 

 but without gills; hinder end funnel-shaped, usually with frilled edges: 

 7 genera. 



Key to the genera of Maldanidae here described : 



<LI Anus dorsal to caudal funnel ................................ 1. MAJ.DANE 



o 2 Anus in center of caudal funnel. 

 &! Anal funnel without cirri ............................... 2. CLYMENELLA 



6 2 Anal funnel with cirri ................................... 3. NICOMACHE 



1. MALDANE Grube. Body elongate, truncated at both ends, most 

 of the segments being biannulated; anus dorsal: numerous species, 

 several in the Woods Hole region. 



M. urceolata (Leidy) (If. elongata Verrill). Body elongate with 19 

 setigerous segments, the middle ones being much elongated ; color reddish- 

 brown; length 30 cm.; width 5 mm.: in sandy mud at low- water mark; 

 North Carolina to Cape Cod. 



