PRONEOMENTA. 295 



ciliated longitudinal groove, anteriorly expanded, containing 5 longi- 

 tudinal folds in front, then three, of which the two lateral ones unite 

 posteriorly with the median. Radula small, with two rows of teeth, 

 each tooth rather straight, long-conic, somewhat over 0'2 mill* long. 

 There are 13 rounded receptacula seminis on each side. Length 

 90, diameter anteriorly 5 mill. 



Northwest coast of Australia, 60 fms. (Gazelle Exped.). 



Proneomenia australis THIELE, Zool. Anzeiger, xx, p. 399 (1897). 

 Differs from P. sluiteri mainly in the biserial radula and numer- 

 ous receptacula seminis. 



P. INCRUSTATA (Koren & Danielssen). 



Body cylindrical, 30 mill, long, 3 broad, pointed towards the an- 

 terior, truncate at the posterior extremity ; strongly incrusted with 

 particles of sand, so that it has a rugged appearance. Mantle desti- 

 tute of the spear-shaped calcareous spieules along the back. 



ffasvig, Finmark, 200-300 fms. 



Solenopus inerustatus K. & D., Beskrivelse over nye arter hen- 

 horende til Slsegten Solenopus, samt nogle oplysminger om dens 

 organisation, in Archiv for Mathematik og Naturvidenskab, ii, p. 

 128 (1877). Trans, in Ann. Mag. N. H. (5), iii, p. 328. Proneo- 

 menia incrustata HANSEN, Bergens Mus. Aar., 1888, p. 4, and of 

 PRUVOT and SIMROTH. 



Known only by the above insufficient description. 



P. BOREALIS (Koren & Danielssen). 



Body cylindrical, 25 mill, long, 3 broad, rounded and rather nar- 

 rower at the anterior end, truncate at the hinder extremity, and in- 

 crusted with sand. Along the whole of the back runs a rather fine 

 but sharp line, which is but slightly elevated and richly beset with 

 short, thick, needle-shaped calcareous spieules. 



Lofoten, etc., Norway, 40-400 fms. 



Solenopus borcalis K. & D., L c. } p. 128 ; Ann. Mag. t. c., p. 328. 

 Proneomenia borealis HANSEN, L c., p. 4. 



Known only by the original description, translated above. 



P. FILIFORMIS Hansen. 



Animal 61 mill, long, 0'75 mill, thick ; anterior end rounded ; 

 posterior end obliquely truncated (Hansen\ 



Sweden. 



