214 Transactions. — Zoology. 



are so characteristic of this genus, the third pair appeared 

 to have in their place four strong, straight, and smooth spines. 

 The foot of the fifth pair was also different, the inner branch 

 bearing several short spinose teeth, the outer lobe, which is 

 hardly produced at all, bearing a single slender short seta. 



If this should prove to be a new species, I would name it 

 Z. hamiltoni, after the enthusiastic naturalist who has done 

 so much to add to our knowledge of Macquarie Island. 



EXPLANATION OF PLATE XIV. 



Pigs. 1-8. Guemea antarctica. Pig. 1x56; figs. 2-8 x 184. 



Fig. 1. Body as seen from the side. 



Fig. 2. Anterior antenna. 



Fig. 3. Posterior antenna. 



Fig. 4. Mandible. 



Fig. 5. Maxilla. 



Fig. 6. Anterior foot-jaw. 



Fig. 7. Foot of fifth pair. 



Fig. 8. Caudal segments and set:.-. 



Art. XXIII. — On the most frequent Pelagic Copepods and 

 Cladoceres of the Hauraki Gulf. 



By Dr. Augustin Kramer, Physician H.I. M.S. "Bussard." 



[Read before the Auckland Institute, 1st October, 1894.', 



Platen XV.-XXIII. 



During a stay of about four months at Auckland, from No- 

 vember, 1893, till February, 1894, I was able to get much 

 "plankton" from very different parts of the Waitemata 

 Harbour (except the interior part, beyond the Sentinel Eock), 

 and of the Hauraki Gulf, between Tiritiri, Great Barrier Island,' 

 and Eangitoto. 



By the measure of more than fifty perpendicular draughts 

 with a volumetric plankton-net I found that the small Crus- 

 tacea, Copepods and Cladoceres, are abundant on every spot, 

 together with many kinds of Diatornacese (Cose i nod 'i sens', 

 Bidulphia, CJuetoceros, Triceratium, Ceratium, etc.). There are 

 also always present a genus of Eadiolaria, some Appeudicularise, 

 and Eotifera. As far as it is possible to work out the material 

 on board a ship in a short time I believe that I have done it ; 

 but naturally this treatise can be no definite one ; but, as 



