DESCRIPTIONS OF GENERA AND SPECIES 437 



See, in addition to above-quoted references, Beddaed (41) and EoSA (9). The 

 species is illustrated by Peeeier. 



(a) Perionyx intermedius, Beddaed. 



p. intermedius, Beddaed, P. Z. S., 1893, p. 689. 



Definition. Length, lo^ mm.; diameter, 5 mm.; number of segments, 117. Colour, a much 

 fainter purple dorsally than is usual. Clitellum, XIII-XVII. The depression upon 

 which the male pores open is shallow; there are a pair only of setae on this area which 

 may or may not he modified. Gizzard in VI, not well developed; calciferous glands 

 absent; intestine begins in XVIII. Last heart in XIII. SpermMhecae two pairs, each 

 with a small globular sessile diverticulum. Spermiducal glands of loose texture extending 

 through segments XVII-XIX. Hab. — Seebpore. 



In the specimens which I have studied the two setae in the area of the male-pores 

 had their points broken off; it cannot therefore be said whether they were ornamented 

 or not ; in any case they were not different in form from those elsewhere. 



(3) Perionyx gruenewaldi, Michaelsen. 

 p. gruenewaldi, Michaelsen, JB. Hamb. wiss. Anst., viii, 1891, p. ^^. 



Definition. Length, 85 mm.; diameter, 3 mm.; number of segments, 158. Clitellum, 

 XIII-XVII. Setae, fifty per segment in the middle of the body, more crowded ventrally. 

 Dorsal pores commence IV/V. Area upon which male pores open bounded by a groove ; 

 four genital setae on each side, ornamented as in P. excavatus. Gizzard rudimentary 

 in VI ; dilatation in XIII corresponding to calciferous glands on other worms. Intestine 

 begins in XIII. Spermathecae two pairs, with one or several small diverticula. Sperm- 

 sacs in X-XII. Spermiducal glands limited to XVIII. Hab. — Sangir. 

 Michaelsen describes a gizzard in segment xiv, but Hokst (17) apparently did 

 not find anything of the kind, though he does not actually contradict Michaelsen 

 in the matter. The small gizzard of segment vi was overlooked by Michaelsen. 



(4) Perionyx violaceus, • Hoest. 



p. violaceus, Hoest, Zool. Ergebn., Ost-Indien, Bd. ii, p. 7 a. 



Definition. Length, ^^mm.; number of segments, 115. Clitellum, XIII-XVII {and the 

 ventral side of XVIII). Dorsal pores commence IV/V. Number of setae in segments 

 in vicinity of clitellum, 40-50 — more crowded on the ventral surface of the 



