294 PRONEOMENIA. 



P. SLUITERI Hubrecht. PI. 43, figs. 17-22. 



Body, in the preserved condition, 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 sluiteri HUBR., Zool. Anzeiger, iii, no. 70, p. 589 

 (1880) ; Niederlandisches Archiv fur Zoologie, Supplementband, 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 compared 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 9s mill. 



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

 eastland and Barentaland, 7080 fins. 



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

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

 wisseusch., xxvii, p. 476 to 512, figs. 1-4 and pi. 20-23 (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 



