REVISE THE GROUP AND TO DETERMINE ITS GEOGRAPHICAL RANGE. 341 



Nephridium, single. 



Anal trees, more tube-like than sac-like, the diverticula branch twice or thrice before 

 ending in funnels. 



Males found in oesophagus only. They have a pair of hooks, and further differ 

 from those of B. in having the opening of the vas deferens not terminal but 



posterior to the hooks on the ventral surface, and in having the posterior half of the 

 body drawn out into a narrow tail. 



Locality. The female was found in a piece of pumice-stone dredged from a depth 

 of 9 faths., not far from Krakatoa. 



Spe<tes 3. BoneUi<t suhmii. Selenka. 



Seleuka. Challenger Reports, Vol. xm. Pt. xxxvi. 1885, p. 9. 



Selenka had only a single specimen, which was first described — not altogether 

 correctlv — by Willemoes-Sulim. Tin- specimen wanted both proboscis and posterior end 

 of body. Selenka's description is very meagre, but he does not doubt that it is a new 

 species. 



Length of body, without hinder end, 8 cm.; greatest breadth 2'9 cm. 



The body tapers posteriorly and on the whole it is somewhat club-shaped. 



Colour, not stated. 



Papillae. Certain wart-like structures covered the skin anteriorly and posteriorly, 

 leaving a broad smooth band where the diameter of the body is greatest. 



Longitudinal muscles, not mentioned. 



Nephridium, single, and from the sketch I take this to be on the right side. 



Anal trees, the primary branches bear the funnels. 



No male was found either in oesophagus or in the single nephridium which con- 

 tained eggs. 



Locality. Lat. 41 14' N. Long. 65° 45' W. off Nova Scotia. Depth 1340 faths. 

 Dredged from blue mud. 



Species 4. Bonellia viridis. Rolaudo. 



Greet. Acta Ac. German. Vol. xll Pt. II., 1879, p. 154. 



Haswell. P. Linn. Soc. N. 8. Wales, Vol. x. Ser. L, 1886, p. 331, 



Marcialis. Boll. Soc. Rom. Zool. No. 1, p. 246. 



Kukeiithal and Weissenborn. Jena Zeitschr. Vol. xix. 1886, p. 776. 



Norman. Ann. Nat. Hist. Ser. vi. Vol. xm., 1894, p. 150. 



Koren and Danielssen, Fauna Littoralis Norwegiae. 3rd Hft., 1877, p. 151. 



After carefully reading Rolando's description of Bonellia fuliginosa, I am inclined 

 to the opinion of Greef that the animal he describes is not specifically distinct from 

 Bonellia viridis. 



