SYNCORYNE GRAVATA. 277 



ramosa of Sars.i Sars, however, himself in a subsequent work- contends against this identifi- 

 cation, and proposes for Loven's species the name of Syncorync Lovmi. 



Syncoryne Loveni is one of the few hydroids in which the medusa, though provided A\ith a 

 well-developed umbrella, remains permanently attached to the trophosome, developing and dis- 

 charging its generative elements at a comparatively early period of its existence, and then wither- 

 ing away without ever !)ecoming free. 



3. Syncoktne GRAVATA, StrctMU Wright. 



CoRYNE GRAVATA, — StretMll Wright, in Trans. Roy. Physical Soc. Edin., 1857, p. 338, pi. xI.k, 



fig- 5. 



TROPHOSOME. — Hydeocaulus simple (?) rising to the lieight of about one quarter 

 of an inch from a creeping- stolon ; perisarc smooth. Hydranths with from ten to 

 twelve short tentacles. 



GONOSOME. — MEDUsji permanently attached, long cylindrical, springing from 

 among the tentacles on the body of the hydranth, umbrella with the marginal tentacles 

 undeveloped, each being represented by' a minute bulb ; manubrium piriform, and 

 Avith its mass of generative elements nearly filling the cavity of the umbrella. 



Colour. — Hydranths and umbrella colourless, marginal bulbs of medusa 1)rown, manubriiuu 

 with its burden of spermatozoa milk white. 

 Development of Gono-iome. — Spring. 

 Habitat. — On the sides of a rock-pool. 

 BatJiymetrical distributio7i. — Literal zone ? 

 Locality.— ISorih Berwick, Firth of Forth (Dr. T. S. Wright). 



I have never met with this species. The above diagnosis, which has been drawn up from Dr. 

 hjtrethill Wright's description, must be regarded as applying strictly only to the male, female 

 specimens not having yet been observed. The growth of the large gonophore, with its voluminous 

 mass of generative elements, occasionally causes the atrophy and almost entire disappearance of 

 the hydranth from which it springs. 



Syncorync yravata is nearly allied to Syncoryne Loveni. It resembles it especially in its 

 gonophores, which, though phanerocodonic, develop and discharge their generative dements with- 

 out ever becoming detached from the trophosome. 



' Sars, ' Eidrag til Sciedyrenes Naturliistorie.' 

 " ' Fauna lit. Norv.' 



