6o 



THE AMPHINEURA 



IV. BIONOMICS. 



The Neomeniomorpha are marine animals, living in depths of 

 from 15 to 800 fathoms, but are most abundant in 50 fathoms. 

 They inhabit oozy bottoms, and are found crawling on corals and 

 hydroid zoophytes, on which they feed. They have been found 

 in nearly all seas except the S.E. and N.W. Pacific and the 

 S. Atlantic. The British genera are Ncomenia, Rhopalomenia, and 

 Myzomenia. About forty species, included in twenty genera, have 

 been recorded up to the present time. 



V. SYSTEMATIC EEVIEW or THE NEOMENIOMORPHA. 



FAMILY 1. LEPIDOMENIIDAE, Pruvot. Slender, tapering behind, 

 with subventral cloacal orifice ; thin cuticle without papillae ; flattened 

 spicules ; no gills. Genera Lepidomenia, Kowalewsky and Marion. 



FIG. 40. 

 Proneomenia gerlachei, left-side view. 6, mouth ; d, cloaca ; si, foot-groove ; t, head. 



Ismenia, Pruvot. Ichthyodes, Pruvot. Mylomenia, Pruvot. Dondersia, 

 Hubrecht. Nematomenia, Simroth. Myzomenia, Simroth. M. banyulensis, 

 Pruvot. Mediterranean and Plymouth. 



FAMILY 2. NEOMENIIDAE, von Jliering. Short, trun- 

 cated in front and behind ; cloacal orifice transverse ; 

 gills present ; rather thin cuticle ; no radula. Genera 

 Neomenia, Tullberg. JY. carinata, Tullberg. North 

 Atlantic, N. and N.W. Scotland. Hemimenia, Nierstrasz. 

 FAMILY 3. PRONEOMENIIDAE, Pruvot. Elongated, 

 cylindrical, rounded at both ends ; thick cuticle with 

 acicular spicules ; radula polystichotis or wanting. 

 Genera Proneomenia, Hubrecbt (Fig. 40). Amphi- 

 menia, Thiele. Echinomenia, Simroth. Rhopalomenia, 

 Simroth. R. aylaopheniae. Mediterranean and Ply- 

 mouth. Notomenia, Thiele. Pruvotia, Thiele. Xtropho- 



Pammtnia cryo- menia > Pvot. 

 phila, ventral as- FAMILY 4. PARAMEXIIDAE, Pl'UVOt. Short, and 



f(t-groove? U ' $l ' truncated in front ; thick cuticle (often without papillae) ; 

 gills and radula present. Genera Paramenia, Pruvot 

 (Fig. 41). Macellomenia, Simroth. Pararhopalia, Simroth. Dino- 

 menia, Nierstrasz. Cyclomenia, Nierstrasz. Proparamenia, Nierstrasz, 

 Uncimenia, Nierstrasz. Kruppomenia, Nierstrasz. 



F;. 41. 



