222 Transactions. — Zoology. 



Pes i. Pes ii. Pes in. Pes iv. 



/ Podon leuckartii, Sars . . 1 1 1 2 



g et£e „ intermedins, Lillj. . . 2 112 



of the ramus-! schodlerii, Czerni 2 3 3 1 



externusof volyphemoides,Leuck. 3 3 3 2 



trisetosus, n. sp. 3 3 3 3 



V „ schrnackeri, Poppe. 4 4 4 2 



The new species is, as already named, 



2. Podon trisetosus, n. sp. Plate XXI., figs. 6-8. 



Every ramus externus is armed with three setae. There is 

 also a good mark of difference between the two Auckland 

 species in the large antenna (figs. 2 and 8) ; for the setae of 

 the 4-jointed ramus are distributed as follows : — 



| 1st joint 



o . . 2nd joint 



Setae of J j J . ■ , 



j 3rd joint 



( 4th joint 

 P. trisetosus is very scarce in the harbour and gulf. 



II. Evadne, Loven. 



Head depressed. Not separated from the body by an 

 incision. 



Only one species has been found ; it is new. Having no 

 spine like Evadne spinosa, which I afterwards found in Jervis 

 Bay, near Sydney, together with this new species, I called it 



3. Evadne aspinosa, n. sp. Plate XXII. , figs. 1-8. 



The body is round (fig. 1). The setae of the ramus ex- 

 ternus of the swimming-feet are 2, 3, 3, 1 ; the two setae of 

 the first appendix (fig. 6) are longer and stronger than the 

 following. This bisetose appendix is a very good mark to 

 distinguish this Evadne from Podon if the form of the body is 

 not quite conspicuous, as sometimes occurs. 



2. Fam. Sidid^e. 



Genus Pen ilia, Dana. 

 Dana described two species — P. avirostris, from Eio 

 Janeiro, and P. orientalis, from the Sunda Strait. I give the 

 details in the description of the species from Auckland. 



4. Penilia pacifica, n. sp. Plate XXIII. , figs. 1-5. 



, Thomson knew of the presence of a Penilia in the Bay of 

 Islands. As I have found it first in the Auckland Harbour, 

 and afterwards in Port Jackson (Sydney), it seems that this 

 species is common in the southern Pacific, and therefore I 

 gave the name pacifica. At first I found one specimen in the 

 Waitemata Harbour ; only in February in Tofino Bay, and in 



