386 A. E. Verrill— Marine Nemerteans of ISFew Migland, etc. 



The mouth is small and inconspicuous when contracted, situated 

 beneath the end of the snout and in front of the cephalic ganglions, 

 often in close connection with the proboscis-pore. 



Lateral longitudinal cephalic slits are wanting and are generally 

 replaced by shallow, transverse or oblique, ciliated grooves or fossje, 

 connected by narrow ducts with small sacs (probably olfactory in 

 function) that connect them with the posterior ganglions. 



Cephalic ganglions rounded, the upper or anterior ones closely 

 united to and largely covering the lower ones. Lateral nerves arise 

 from the posterior ends of the inferior ganglions and run back 

 within the inner muscular layer of the body-wall. 



Ocelli various, often numerous; sometimes wanting. 



Three large, longitudinal vascular trunks are well developed; a 

 vascular loop in the head. 



Intestine large and straight, sacculated. Muscular walls of the 

 body consist mainly of two layers, an outer circular, and an inner 

 longitudinal one. 



The young, so far as known, undergo no marked metamorphosis. 



The species are chiefly marine; a few fresh- water and terrestrial 

 species are known. 



Family, Amphiporid^ Mcintosh (restr.) 



Body moderately elongated. Proboscis with a thick, tubular, 

 evertible anterior portion, its walls consisting of about seven 

 layers, the inner surface (or outer when protruded) thickly covered 

 with papillae; middle region furnished with a simple central stylet 

 and generally two or four lateral chambers containing pin-shaped 

 stylets, but the lateral sacs are sometimes wanting; posterior region 

 tubular, with two muscular layers, an outer circular and an inner 

 longitudinal layer. (Esophagus with a dilated and plicated anterior 

 portion in the head. 



The family Tetrastemmidm Hubr. is here included. I can find no 

 characters that seem to me sufiicient to warrant even a sub-family 

 distinction between Tetrastemrna and Amphiporus. 



On the other hand, I would separate Drepanophorus Hubr. as a 

 separate family, Dbepanophorid^, characterized by having the 

 central armature of the proboscis in the form of a lamina or plate, 

 bearing several stylets or denticles ; by the numerous styliferous 

 sacs ; and by the presence of lateral caecal sacs connected with 

 the sheath of the proboscis. 



