PRONEOMENIA. 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 spicules along the back. 



Hasvig, 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 spicules. 



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



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

 Proneomenia borealis HANSEN, 1. 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. 



