PRONEOMENIA. 191 



NEOMENIIDAE Simuoth. 



Body compressed, more or less crescent-shaped, without distinct divisions. 

 Index 7 at most. Opening of atrium ventral, of the anal chamber ventral or 

 terminal. Ventral furrow present, usually with several folds. Cuticle some- 

 times comparatively thick, spines mostly needle-like, flat, grooved or hollow. 

 A circlet of gills in the anal chamber. Radula and salivary glands usually 

 lacking. Epidermal papillae, of simple structure, usually present. Fore gut 

 protrusible, coelomoducts separate or united to form a shell gland or copulatory 

 organ. Digestive gland lacking. Penial spines usual present. Free, creeping 

 about over bottom. 



NEOMENIA TuLLBERCi, 1875. 



Body thick-set and usually compressed laterally, 2-3 cm. long, with 

 anterior and posterior ends similarly shaped. Cloacal opening subterminal. 

 Ventral fold present with the groove extending to the cloacal chamber. Spic- 

 ules needle- or spearhead-shaped, projecting from the cuticle. Broad stalked 

 papillae present. Branchial folds in the cloacal chamber. Copulatory spines 

 usually present. Radula absent. Type of genus, N. carinata. 



N. verrilli, sp. nov. 



Body tliick-set, unkeeled, 25 mm. in length by 8 mm. greatest thickness. 

 8 ventral folds, 30-40 branchial folds. Accessory copulatory apparatus present. 

 Gulf of St. Lawrence, 313 fathoms, (p. 206). 



PRONEOMENIIDAE Simroth. 



Worm-like. Radula distichous or polystichous, sometimes lacking. SaU- 

 vary glands tubular, lobed or lacking. Cuticle thick, spicules mostly needle- 

 like in several layers. Epidermal papillae present. Gills usually lacking. 

 Coelomoducts usually united into a shell gland, sometimes separated. Copu- 

 latory spicules may be present. Free living, partly or entirely parasitic. 



PRONEOMENIA Hdbrecht, ISSO. 



Body elongated, vermiform, the length 9-50 times the diameter. Cloacal 

 opening ventral. Foot present, the groove passing into the cloacal chamber. 

 Cuticle thick with crowded spicules in several layers. No gills. Radula 



