;554 CORYNOPSIS. 



yet by no means sufficiently acquainted with the " Ifj/dracfinia arcolala " — no alternative but to 

 allow the absorption of RInzodine into Podocoryne. This view is taken by llincks, and the 

 present state of our knowledge will justify it. It is possible, however, that a fuller accjuaintancc 

 with Mr. Alder's hydroid may require the restoration of the genus Rldzodine. 



The resemblance between the medusa of Fodocoryne areolata and that of Podocoryne carnea 

 has been noticed by Alder. Indeed, the two medusae scarcely differ from one another, except in 

 the fact that while the medusa of Podocoryne carnea has at the time of its liberation only one 

 marginal tentacle in each inter-radial space, that of Podocoryne areolata has at the same period 

 three inter-radial tentacles between each of the radials. The middle one of these three inter- 

 radial tentacles is longer than that placed at each side of it, the latter being as yet scarcely 

 developed beyond the condition of a mere tubercle. 



Of the two specimens which had come imder Mr. Alder's observation, one " was obtained 

 parasitical on a dead shell of Natica Alderi, brought in by the fishing boats at Cullcrcoats." 

 The other was " a dead and rather worn specimen upon Natica Granlandica among the zoophytes 

 collected in Shetland by the Rev. A. M. Norman." 



COEYNOPSIS, AUman. 



Name — Kopvvi], a club, and oi/.(c, face (resemblance), in allusion to the club-like form of 

 the hydranths. 



Podocoryne, — Hodge. 



TROPHOSOME. — Htdkanths claviform, with a single circlet of filiform tentacles 

 round the base of a conical liypostome. 



GONOSOME. — Planoblasts borne on the body of the hydranth at the proximal 

 side of the tentacular circlet. Medusa deep bell-shaped; manubrium having its 

 mouth surrounded by four short capitate tentacles; radiating canals four, each 

 terminating distally in a bulb, from which are developed two tentacles, each with a 

 distinct ocellus at its base. 



We are indebted to Mr. Hodge for the tirst notice of the hydroid on which the genus 

 Corynojjsis has been founded. He described it, however, as a Podocoryne, under the name of 

 Podocoryne Alderi; and though he does not give any definite description of the common base, 

 we may assume, until further observation proves the contrary, that this is similar to that of the 

 true Podocorynes. Taking for granted that there is no error of observation in ]\Ir. Hodge's 

 account of his Podocoryne Alderi, it is plain, however, that this hydroid must Ijc separated from 

 Podocoryne, for the medusa which he assigned to it is of an entirely different type from that of 



