On. the Pelagic annelids of Japan. I 3 



Parapodium long biramous; fin? broad und thin, occuring all 

 around the margin of rami. Without " rosette-form " organ. 



There, exists no fin-gland in the first two pairs of parapodia. 

 while all the remaining parapodia have each ventral fin-gland, the 

 fourth having a dorsal fin-gland in addition. 



Habitat: — Misaki; Miho in Pro v. Suruga. 



Tomopteris septentrionalis de Quatrefages. 



1865. Tomopteris septentrional is, de Quatrefages, Hist. Nat. des Annelés, torn. II, p. 229. 

 1883. Tomopteris septentrionalis, Levinsen, Systeniatisk-geografisk Oversigt over de 



nordiske Annulata etc. p. 248. 

 1900. Tomopteris septentrionalis, Apstein, Die Alciopiden u. Tomopteriden der Plankton- 

 Expedition, pp. 37, 38, 41. 

 1905. Tomopteris septentrionalis, Reibisch, Nordisches Plankton. X. Anneliden, p. 9. 

 1908. Tomopteris septentrionalis, Rosa, Raecolte Planctoniche fatte dalla R. N. "Liguria.'' 

 Vol. I, p. 297. 



Body measures 13.0 mm. in length, 1.0 mm. in maximum 

 breadth and 3.5 mm. in same including fins at about the 8th 

 parapodiated segment. It comprises 20 parapodiated segments 

 in addition to head and anal segment, Without tail-region. 



Cephalic tantacles slender. Eyes two, each with a distinct 

 lens which is directed laterally. First pair of tentacular cirri 

 absent; second pair a little longer than § the length of body. 



Nuchal ciliated grooves extend backward far beyond the line 

 of eyes in dorsal aspect of the worm. 



Parapodium long, biramous; fins broad, extending all around 

 margin of the rami. 



Fin-gland of a deep yellow colour is found in ventral 

 parapodial fin near tip of the ramus, beginning in the first and 

 ending in the sixteenth parapodium. Twentieth parapodium is 

 rudimentarily developed. Without "rosette-form" organ. 



Habitat:— Misaki, March 29th, 1909. 



Tomopteris Apsteini Rosa. 



Tomopteris scolopnulra, Keferstein, Einige Bemerkungen über Tomopteris. Arch, 

 f. Anat., Physiol, ete. Jahrg. 1861. p. 360. 



