204 DE. W. B. BENHAM ON 



and a still larger one in segment xii. ; but in this last, as in the 

 dorsal vessel posterior to this segment, the blood was purple^ 

 I have not seen this difference in colour noted before, and I am 

 not able to explain it. 



There are three pairs of spermathecce, all alike ; the sac is 

 somewhat heart-shaped (fig. 2 c), and has a distinct and curved 

 duct, on which is borne a very small sessile globular diver- 

 ticulum (^div.). The spermiducal gland (fig. 2 d) is large and has- 

 a very " loose " structure (perhaps due to ill-preservation) ; it is 

 deeply cleft, and occupies segments xvir., xviii., and xix. The 

 duct {d) is short and nearly straight, and opens directly to the 

 exterior. 



The diagnosis is as follows : — 



Peeich^ta. SfiDawiCKii, n. sp. 



Reddish-brown bands alternating with yellow chsetal bands,, 

 median dorsal brown stripe ; measures 100 mm. x 5 mm., with 

 86 segments. Clitellum xiv. to xvi., with complete circles of 

 chsetae. Male pore small, on papiliiform porophore, surrounded 

 by a horseshoe-shaped deep groove. Three pairs of sperma- 

 thecse, in vi., vii., vm., opening anteriorly ; pyriform sac, with 

 long duct, bearing small, globular, sessile diverticulum. Dorsal 

 pore xii./xiii. Chsetal ring with dorsal and ventral gaps ; 

 45 chsetse in front of, 54 behind, clitellum ; those of segments 

 IT. to VIII. larger than the rest. A median ventral intestinal 

 ccecum in xxii. the usual pair of caeca absent (?) Spermiducal 

 gland large, loose, much incised ; short, straight dnct ; no- 

 muscular bulb. 



Hai. Blanche Bay, Kew Britain. 



Affinities. — There are seven species recorded by Beddard in 

 his monograph, possessing 3 pairs of spermathecce in segments 

 Yi., VII., & Yiii., to which four have since been added. 



jProm those with a " short clitellum," viz. P. hermudensis, 

 Bedd., P. mandhorensis, Mich., P. liaivayana, Eosa, the present 

 species differs in a number of points. 



In P. hermudensis nothing is recorded about the colour-banding ;: 

 there are cbEetse only on the last clitellar (16th) segment ; 

 enlarged chsetse exist in segments ii., iii., iv., and various other 

 difi'erences, such as the group of pores round the " porophore." 

 P. hawayana differs, too, in the position of the stouter chsetaSy 

 in the dorsal pore, the paired cseca, the shape of the sperma- 



I 



