192 DONDERSIIDAE. 



multidentate. Two salivary glands. Copulatory spines present or absent. 

 Type of genus, P. sluiteri. 



P. acuminata Wiren. 



Length index 9.3. Radula present, (p. 215). 



DORYMENIA Hkath, 1911. 



Vermiform, body terminating posteriorly in a finger-shaped elongation. 

 Radula multidentate with 9-51 longitudinal rows of from 9-22 teeth in each 

 transverse row. One pair of seminal receptacles. A pair of long copulatory 

 spicules closely associated with a pair of globular coeca or deep pits likewise 

 opening separately into the cloacal chamber. Type of genus, D. acuta. 



D. peroneopsis, sp. nov. 



Body 25 mm. in length by 2 mm. in greatest thickness. Radula with 9 

 longitudinal rows of teeth and 22 teeth in each transverse row. Accessory 

 copulatory apparatus present. Off the Massachusetts coast at a depth of 

 1,753 fms. (p. 222). 



STROPHOMENIA Pruvot, 1899. 



Body elongated, cyUndrical, the thick cuticle penetrated by acicular spic- 

 ules and closely crowded vesicular papillae. Radula and salivary ducts present. 

 Two distinct genital openings into the cloacal chamber usually present. Type 

 of genus, S. lacazei. 



S. agassizi, sp. nov. 



Worm-hke, 22-37 mm. in length by 1.1-1.5 mm. average diameter. Papillae 

 stalked, numerous; spicules needle-Uke. Radula very small. Ventral salivary 

 glands tubular. Nine pairs of seminal receptacles. Off Massachusetts coast, 

 G77 fms. (p. 229). 



DONDERSIIDAE Simroth. 



Body often worm-like; cuticle thin; spines flat and soUd. Papillae lacking. 

 Radula distichous, monoserial or lacking. SaUvary glands globular, sac- or 

 tube-Uke. Gill folds lacking. Coelomoducts united or separate. Copulatory 

 apparatus may be present. Ventral fold and furrow may be absent. Liv- 

 ing free upon corals, etc. 



