170 NOTOPYGOS CRINITA. 



any serration , whereas in the largest specimen the dorsal 

 as well as the ventral bristles possess three or four faint 

 serrations near the tip of the longer process; from this 

 fact it becomes obvious that not too much reliance can be 

 placed on the presence or absence of such faint serrations 

 and that this character is not of so great importance for 

 distinguishing the species. I believe that an error has 

 crept into the description of Kinberg, who asserts that 

 the genus Notopygos should have serrated bristles. From 

 the preceeding remarks it results, that Kinberg's assertion 

 that the genus Lirione should be distinguished from Noto- 

 pygos by having smooth bristles , cannot longer be main- 

 tained , and I am inclined to agree with Grube's supposi- 

 tion that the genus Lirione and Notopygos may be identical 

 or based upon younger and older individuals of the same 

 species. 



Genus Mipponoë Audouin & M. Edwards. 



Hipponoë Gaudichaudi Aud. & M, Edw. — Baird , loc. cit. 

 p. 239. — M'Intosh, loc. cit. p. 30, pi. I, fig. 5; pi. IV, 

 fig. 3; pi. IIIa, figs. 13—17. 



Several individuals of this species we owe to the kind- 

 ness of Dr. P. P. C. Hoek , who found them concealed 

 in the valves of Lepas fascicularis from the North Pacific. 

 They agree rather well with M'lutosh's description, except 

 in a few points. The unpaired median tentacle does not 

 project as far backward as the middle of the second body- 

 ring , but extends only a little beyond the anterior margin 

 of that segment. In all our specimens the branchiae com- 

 mence on the third body-ring, quite like in the form 

 from Port-Jackson, described and figured by Audouin and 

 M. Edwards ') and I believe that M'Intosh has been 

 mistaken in mentioning them to commence on the fourth 

 segment. On the inner-side of the fleshy margin , sur- 

 rounding each ventral bristle-fossa, I find a papilla , which 



1) Annal. Sc. Nat. T. XX, 1830, p. 156, pi. Ill, fig. 4. 



Notes from the Leyden IMuseum, Vol. VIII. 



