G8 On a neio Species of the Genus Peiionyx. 



Perionyx shoeanus, sp. n. 



A single ppecimen only. 



External characters. — The body mea5?ures 165 mm. in 

 lenrrtli and 5-G mm. in tliickness ; tlie number of segments 

 is 205. 



The colour is brownish. 



The prostomium is pro-epilobus (1). 



Tlie setaj are arranged in continuous rings as follows : — 

 35/ii., 43/iii., 57/vi.j 4G/x. ; dorsal and ventral gaps in the 

 rings of setas are not constant. The setae are provided with 

 some small semilunar excavations on the distal tract. 



The clifellum is not yet developed. 



The male pores are on xviii. segment, close to the ventral 

 middle line. 



A similar position is taken by the three pairs of sperma- 

 thecal pores in the intersegmental furrows vi./vii., vii./viii., 

 and viii./ix. 



Female pores as nephridi;il and dorsal pores are not visible. 



Internal anatomy. — The septa vi.— vii. to xv.-xvi. are 

 moderately thickened. 



An imperfectly developed gizzard lies in vi. segment. 

 The portion of the oesophagus which occupies segments viii. 

 to XV. is wider than elsewhere and is provided with many 

 deep folds of epithelium. These folds are longitudinal and 

 are provided with a blood-vessel. The intestine begins at 

 the xvii. segment ; a typhlosole is not recognizable. 



Three pairs of moniliform hearts are found in segments 

 X., xi., and xii. 



The nephridia are meganephridia regularly disposed in 

 two longitudinal series, close to the ventral nerve-chain. 



A single pair of sparsely lobulated sperm-sacs lies in xii. 

 segment. 



A single pair of prostates is present. Each prostate is a 

 tongue-shajied body, not divided into lobes, which projects 

 from the side of the nerve-cord laterally into the xviii. 

 segment. Penial sette are wanting (perhaps in relation with 

 the immature condition). 



The tiiree pairs of spermrxthecse lie in segments vii., viii., 

 and ix. Each spermatheca consists of an oval main pouch 

 with a very short duct ; two small globular diverticula are 

 placed on each side of the distal extremity of the duct. 



Loc. Shoe Island, near Auckland Island. 



The occurrence of a species of the genus Perionyx in a 

 subanfarctic island is a surprise. Tiiis genus was only 



