240 Transactions. — Zoology. 



Hab. I found numerous individuals washed np on the Ocean Beach near 

 Dunedin on two different occasions. They appear to come ashore in fine 

 clear calm weather. 



EXPLANATION OF PLATES XII. AND XIIL, Figs. 1-5. 

 Plate XII. 

 Figs. 1-8. Corophium excavatum. 



I. Adult; 2. mandible; 3. second gnathopod; 4. third pereiopod ; 5, 6 and 

 7. ante-penult., penult., and ultimate pleopoda ; 8. telson. 



Figs. 9-10. Edotia dilatata. 



9. Adult female ; 10. opercular plate. 

 Figs. 11-13. Pseudcega punctata. 



II. Dorsal view ; 12. lateral view ; 13. head, seen from the front. 

 Figs. 14-21. Oxycephalus edwardsii. 



14. Adult male ; 15. anterior antenna, female ; 16. anterior antenna, young 

 male ; 17. posterior antenna, young male ; 18. mandible-palp ; 19. first 

 gnathopoda; 20. second gnathopod; 21. crystalline cones of the lateral 

 eyes. 



Plate XIIL 

 Fig. 1. Oxycephalus edwardsii. 



Posterior portion of abdomen, showing telson and three posterior pairs of 

 pleopoda ; also the structure of the extremity of the intestine. 

 Figs. 2-5. Allorchestes recens. 



2 and 3. female and male anterior gnathopoda ; 4 and 5. female and male 

 posterior gnathopoda. 



Art. XII. — On a neiv Sj^ecies of Daphnia. By Geo. M. Thomson, F.L.S. 

 [Read before the Otago Institute, 1th May, 1883.] 

 Plate XIIL, figs. 6-9. 

 Last year Mr. Chas. Chilton sent me down specimens of a new Daphnia 

 from South Canterbury, differing markedly from the form common about 

 Dunedin, and which was described by me as D. obtusata in Trans. N.Z. 

 Inst. vol. xi., p. 261. 



It is singular that these two species of Daphnia and one of Chydorus 

 should be the only representatives of the Cladocera hitherto found in New 

 Zealand. "While the general poverty of our fresh-water fauna may no 

 doubt hold good in this case as in so many others, it is yet probable that 

 a search in other parts of our islands will result in the discovery of other 

 forms. 



