CORYNOPSIS ALDERl. 355 



the latter genus. It cannot, indeed, at the time of its liberation, be distinguished from that of 

 Jiou(/ainvUHa at the same stage of its development. The further progress of the Corynopsis 

 medusa has not been traced, but it is highly probable that it corresponds to that of the medusa 

 of Boiif/ainvUlia, and that we have thus two genera with similar gonosomes, though with different 

 trophosomes. 



Corynopsis Aldeki, Hodge, sp. 



PoDocoRVNE Aldbri, — Hodijc, in Trans. Tyneside Nat. Field Club., vol. v, pi. ii, figs. 



10—15. 

 CoaYNOPsis Alderi, — Allman, in Anu. Nat. Hist, for May, 18G1. Hincks, Brit. Hydr. 

 Zooph., p. 31, pi. vi, fig. 2. 



TROPHOSOME. — Htdranths attaining a height of from one quarter to half an 

 inch, gradually tapering from the distal to the proximal extremity, tentacles six to 

 twelve in number. 



GONOSOME. — Medus^e springing from the hydranths in an imperfect verticil at 

 a short distance behind the tentacular circlet. 



Colour. — Hydranth pale pink, medusa having its manubrium pale green, and tentacular 

 bulbs red. 



Development of Gonosome. — August and September. 



Habitat. — On shells from deep water. 



Haihymetrical dhtrUmtion. — Deep water zone. 



Locality. — Seaham Harbour, Coast of Northumberland, j\Ir. Hodge. 



Considering how large an amount of caution is necessary in order to avoid referring to their 

 wrong trophosomes the free medusaj developed in our aquaria, it is impossible not to wish for 

 further observations which might tend to verify Mr. Hodge's reference of a Bonyainvillia-We 

 medusa to a trophosome, so very different as that of his Podocoryne Alderi is from the trophosome 

 to which this form of medusa had been hitherto traced. Coming, however, as the account does 

 from an observer so trustworthy as Mr. Hodge, we should not be justified in refusing to accept 

 it. This assent is all the more easy when we recollect that the present is not the only case of the 

 kind which has been recorded, for Hincks has shown that the medusa of Stauridia producta 

 cannot be distinguished, at least at the time of its liberation, from that of Coryne cxlinia. 



46 



