916 MR. F. E. BEDDARD ON ISOPODA COLLECTED [DeC. 1, 



3, Preliminary Notice of the Isopoda collected during the 

 Voyage of H.M.S. 'Challenger/ — Part II.' Munnop- 

 sidce. By Frank E. Beddard, M.A., F.R.S.E., F.Z.S., 

 Prosector to the Society ^. 



[Eeceivecl November 19, 1885.] 



The family of the MunnopsidEe, originally founded by Prof. M. 

 Sars on a single species, Munnopsis typica, is now known to in- 

 clude a large number of species, which have been referred by Prof. 

 G. O. Sars to four distinct genera, viz. : Munnopsis, Desmosoma, 

 Ihjarachna, and Eurycope ; the majority of these Isopoda have been 

 dredged off the coast of Norway by G. O. Sars ; Munnopsis typica 

 and Eurycope gigantea have been described as occurring in the 

 Arctic region, and two species Munnopsis typica and Eurycope 

 robusta have been recorded by Harger from the E. coast of N. 

 America. Beyond a few scattered observations in papers communi- 

 cated to the Royal Society of London (Proc. Eoy. Soc. 1874) by 

 the late Dr. V. Willemoes Suhm, nothing is known of the forms 

 which inhabit the southern hemisphere. The specimens dredged 

 by the ' Challenger ' nearly all come from the antarctic area ; they 

 are referable to fourteen distinct species, including one new genus. 

 I have named them as follows : — 



1. Eurycope sarsii. 



2. Eurycope novce-zealandice. 



3. Eurycope atlantica. 



4. Eurycojie fray His. 



5. Eurycope pellucida. 



6. Eurycope abyssicola. 



7. Eurycope spinosa. 



8. Eurycope intermedia. 



9. Ilyaruchna, sp. 



10. Munnopsis latifrons. 

 J 1 Munnop)sis australis. 



12. Munnopsis gracilis . 



13. Acanthocope spinicauda. 



14. Acanthocope acutispina. 



All these species are, with the exception of IlyaracAna, inhabitants 

 of deep water. 



Munnopsis, Sars. 

 Three out of the fourteen Munnopsids obtained by the ' Chal- 

 lenger ' appear to me to be referable to the genus Mimnopsis ; in 

 one instance (M. gracilis) there can be, I should imagine, but little 

 doubt of the correctness of this identification. Both the remaining 

 species diverge somewhat in structure from Munnopsis typica ; the 

 diflFerences are, however, perhaps not greater than those which 

 separate different species of other genera (e. g. Desmosoma), and I 

 prefer, therefore, for the present at least, to retain both species 

 within the genus Munnopsis without pledging myself definitely. 



1. Munnopsis gracilis, n. sp, 



A single specimen of this species was dredged off the North 

 Island of New Zealand in 1100 fathoms of water. 



The single specimen is a male and measures 12 millim. in length. 



1 See P. Z. S. 1884, p. 330. 



* Published by permission of the Lords Commissioners of the Treasury. 



