298 ANNELIDA 



Suborder 5. SCOLECIFORMIA. 



Head without appendages (except in the Chlorhcemidae) ; parapodia 

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



Key to the families of Scoleciformia here described: 

 Ci Head without appendages. 

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



1. Ophfjliidae 

 62 Segmentation not equivalent; body made up of 2 or 3 more or loss dis- 

 tinct regions. 



Ci Worms slender and without gills 2. Maldanidae 



C2 Worms thick, with branching gills on the middle segments. .3. Akenicolidae 

 Ca Head with appendages 4. Chlorh^midae 



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; 



Fig. 471 head formed of the fused prostomium and peristomium 



fimhriata 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 ^dges: 



7 genera. 



Key to the genera of Maldanidae here described : 



ai Anus dorsal to caudal funnel 1. Maldane 



Uj Anus in center of caudal funnel. 



61 Anal funnel without cirri 2. Clymenella 



62 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) (M. 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. 



