FKOM TUB SANDWICH ISLAJSDS. 



205 



1896.] 



other and to the parietes by a considerable number of ligamentous 

 threads. The three septa which corae immediately after the 

 gizzard are stouter than those which follow ; but here, again, the 

 increase in thickness is not very marked. 



Fig. 2. 



Perichtsta insula, 



2 , Oviducal poro. (J , male poro. 

 p, papilloe. 



Tiie pharynx, as is so usual in Perichceta, is beset with numerous 

 racemose glands ; these extend back as far as the sixth segment. 

 The gizzard is rather bell-shaped, diminishing in transverse 

 diameter anteriorly, but truncated posteriorly, where it has a 

 thickened rim. The intestine begins abruptly in the xvth segment 

 at about the middle of that segment. The csBca extend through 

 two segments. The last heart is in segment xiii. 



The sperm-sacs, compact in form, are in segments xi., xii. as usual. 

 The spermiducal glands, also rather compact, commence in xvii. and 

 extend as far back as xx. The duct is stout and S-shaped. 



The spermaihecce are in vi., vii. Each has a diverticulum about 

 half its own length, of an elongated oval form. 



Hah. Hong Kong. 



Pebioh^ta trityphla, n. sp. 



The length of this species (after preservation in Perenyi's fluid) 

 is 63 mm. ; that individual consisted of about 75 segments. 

 The seta-formula is as follows : — 



I. 

 25 



VI. 



XII. 

 49 



XVII. 

 49 



