294 PRONEOMENIA. 



P. 8LUITERI Hubrecht. PI. 43, figs. 17-22. 



Body, in the preserved coudition, stiff and light brown, cylindri- 

 cal, thicker toward the anterior extremity ; integument densely beset 

 ■with spicules (fig. 21) placed at right angles to each other, and about 

 0*2 mill, long, shaped like elongated cones, pointed at one end, 

 truncated at the other. Radula (fig. 22) multiserial. Length 105 

 -148 mill., about 14 times the breadth. 



Barents Sea, 110-160 fms. 



Proneomenia sluiten Hubr., Zool. Anzeiger, iii, no. 70, p. 589 

 (1880) ; Niederliindisches Archiv fiir Zoologie, Suj)plementband, i, 

 pp. 1-75, pi. 1-4. — Pruvot, Arch. Zool. Exper. et Gener., (2),ix, p. 

 731.— SiMROTH, in Bronn, p. 228, pi. 3,f. 1-16. 



Var. LANGi Simroth. PI. 43, figs. 23, 24. 



Animal having a neck-like constriction behind the anterior end; 

 breadth somewhat greater com|)ared with the length. Length 98, 

 greatest height and breadth 10 mill.; least height 8, least breadth 

 6 mill., mouth 4 mill, long, the ventral groove beginning 1 mill, be- 

 hind it ; cloaca 6 mill, from hind end of ventral groove and 2 mill, 

 long. A smaller specimen had a length of 75, greatest height 10, 

 greatest breadth 92 mill. 



Northern part of Olga Strait, between Konig Karls Islands, North- 

 eastland and Barentdand, 70-80 fms. 



P.sluileri HEUSCHER,Vierteljahrisch. Naturforsch. Gesell. Zurich, 

 xxxvii, 1892, pp. 148-161, figs. 1-4 ; Jenaische Zeitschr. fiir Natur- 

 wissensch., xxvii, p. 476 to 512, figs. 1-4 and pi. 20-28 — (Quart. 

 Journ. Roy. Mic. Soc, 1893, p. 313; 1892, p. 771).— Lang, Lehr- 

 buch der Vergleich. Anat., p. 569, fig. 386 ; and H. M. & M.Ber- 

 nard's translation. Text-book of Comp. Anat., pt. 2, p. 3, f. 2. — P. 

 langi Simroth in Bronn, p. 228. 



Doubtfully distinct from P. sluiteri. 



P. AusTRALis Thiele. 



Similar to P. sluiteri. Cuticle 0-33 mill, thick, beset with spicu- 

 les of the usual form, mostly hollow ; those near the cloacal opening 

 with the points bent toward the middle; in immediate proximity to 

 the cloaca are very numerous smaller spicules, which are also fre- 

 quently bent hook-like ; to the right and left is a flat excavation, 

 clothed with cuticle and these spicules. The dorsal posterior sense 

 organ is also surrounded with small spicules. Ventrally runs the 



