PRONEOMENIA-RHOPALOMENIA. 297 



Body elongated, vermiform. Length 8-23 times the breadth. 

 Gills present in the form of longitudinal folds. Radula and two 

 salivary glands present. Having single tube-shaped penes (?). Type 

 S. sarsii. 



This subgenus differs from Proneomenia in the development of 

 gills. 



P. MARGARITACEA (Koren & Danielssen). 



Body round, thick, strongly glistening, pointed at the anterior end, 

 truncated transversely posteriorly ; 12 mill, long, 1? mill, thick at the 

 broader posterior end. Mantle covered with needle- and lancet- 

 shaped spicules. Two tubular penes. 



Hvidingsoerne, Stavanger, Norway, 40-60 fms. 



Solenopus margaritaeeus KOR. & DAN. I.e., p. 128 (trans, in Ann. 

 Mag. N. H. (5), iii, p. 328). SIMROTH, 1. c., p. 228. Neomenia mar- 

 garitaeea PRUVOT, Arch. Zool. Exper. (2), ix, p. 729. Proneomenia 

 margaritacea HANSEN, Bergens Mus. Aarsberetning for 1888, p. 4. 



P. SARSII (Koren & Danielssen). PL 43, fig. 29. 



Body cylindrical, 70 mill, long, 3 mill. diam. , the posterior [an- 

 terior] end transversely truncated, the anterior [posterior] end 

 snout-shaped, extended. 



Christianafjord, 100-200 fms. 



Solenopus sarsii KOR. & DAN., 1. c., p. 128 (Ann. Mag. N. H. (5), 

 iii, p. 328). SIMROTH, /. c., p. 228. Proneomenia sarsii HANSEN, 

 Bergens Mus. Aarsberetning for 1888, no. 6, p. 1-11, pi. 1, f. 8-10. 

 Neomenia sarsii PRUVOT, Arch. Zool. Exper. (2), ix, p. 729. 

 Fig. 29, one gill containing blood corpuscles. According to Hansen 

 (I. c., p. 10) the descriptions of the two ends of this species given 

 by Koren and Danielssen should be transposed. 



Genus RHOPALOMENIA Simroth, 1893. 



Rhopalomenia SIMROTH, Klassen u. Ordn. des Thier-Reichs, p. 

 229. 



Body vermiform, pointed in front and behind. Cloaca opening 

 a ventral longitudinal slit, passing into the foot-groove. Foot pres- 

 ent. Cuticle thick, enclosing obliquely crossed, needle-shaped spic- 

 ules, pointed at each end, free from the epithelium ; with club- 

 shaped, narrow pedicled papillae, projecting in the cuticle near to 

 the surface. Gills wanting. Radula many pointed or wanting. 

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