218 Mr. E, J. Miers on new Species of Crustacea. 



sexually or asexuallvj could not, as already stated, be decided 

 by me. 



At first I thought I was justified in regarding the brood 

 parasitic in the Garniarino} as belonging to the Gunina dis- 

 coidalis^ Kef. & Ehl., which is pretty frequent at Villafranca 

 and Naples ; (and the resemblance of the Gunince sprouting in 

 the stomach of Gannarina to G. discoidalis has already been 

 noticed by Noschin ;) but subsequently this supposition proved 

 to be unfounded, as the young Gimince constricted off from the 

 parasitic polypes became further developed in my aquaria, 

 and then gradually lost their resemblance to G. discoidalis, 

 two new marginal corpuscles, with the mantle-lobes belonging 

 to them, being developed upon each segment. 



Summing up the conditions here briefly described, it ap- 

 pears : — 1, that the Gu7i'ina-hroo([ which is developed in the 

 stomach oi Gar marina hastata, Hiick., stands in no genetic coji- 

 nexion with the Geryonid\ and, 2, that the species of Gunina, 

 the young of which is parasitic upon the Geryonid, is subject 

 during its evolution to an alternation of generations. As is 

 well known, a species of Gunina [G. octonaria) has already 

 been observed by M'Crady, the brood of which is parasitic, as 

 a proliferant polype, in an Oceanid [Tarritopsis nutricola). 

 As the Gunina octonaria of M'Crady certainly belongs to the 

 same group [Gunina in Metznikow's sense) as that observed 

 by me, and as this peculiar mode of development has hitherto 

 been observed only in the species of this group, we may sup- 

 pose that perhaps all the species of this group are subject to an 

 alternation of generations, contrary to what takes place in the 

 species of the group Pohjxenia, Metzn., which are developed 

 directly without alternate generations. 



XXII. — Descriptions of some neio S^yecies of Grustacea, chiefly 

 from New Zealand. By Edwaed J. MiERS, F.L.S., of 

 the Zoological Department, British Museum. 



Having been intrusted by Dr. Hector, F.R.S., with the com- 

 pilation of a Catalogue of the species of Podophthalmatous and 

 Edriophthalmatous Crustacea of Ncav Zealand for the New- 

 Zealand Government, I have thought it desirable to publish 

 without delay descriptions of such species as do not appear to 

 have been hitherto recorded : the ty})e specimens of nearly all 

 of these are in the collection of the British Museum, and they 

 will be figured in the Catalogue. I have added descriptions 

 of one or two allied new species from Australia and Tasmania 

 in the collection. 



