PRONEOMENIA-RHOPALOMENIA. 297 



Body elongated, vermiform. Leugth 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. saysii. 



This subgenus differs from Proneomenla 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, Ij mill, thick at the 

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

 shaped spicules. Two tubular penes. 



Hvidlngsoerne, Stavanger, Norway, 40-60 fms. 



Sole)iopus margarltaceus KoR. & Dan. I.e., p. 128 (trans, in Ann. 

 Mag. N. H. (5), iii. p..328). — Simroth, I. c, p. 228. — Neomenia mar- 

 g((ritacea Pruvot, Arch. Zool. Exper. (2), ix, p. 729. — Proneomenia 

 vKtrgaritdcea Hansen, Bergens Mus. Aarsberetning for 1888, p. 4. 



P. SARSii (Koren & Danielssen). PI. 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., I. c, p. 128 (Ann. Mag. K 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 

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

 by Koren and Danielssen should be transposed. 



Genus RHOPALOMENIA Simroth, 1893. 



Bhopalomenia 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 papillse, projecting in the cuticle near to 

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

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