834 MR. E. T. BROWNE ON BRITISH MEDUSAE. [NoV. 10, 



peduncle and the stomach ; mouth with four lips. The stomach 

 and mouth of a delicate pinkish colour. Eight radial canals lead 

 from the stomach, along the peduncle and down the sub-umbrella, 

 to the ring-canal. Upon each radial canal, at the summit of the 

 umbrella-cavity and close to the peduncle, the gonad originates, 

 first as a small oval swelling and at a later stage bangs freely down 

 in the umbrella-cavity. The margin of the umbrella is lined with 

 tentacles, about 80 present, colourless when fully expanded, but 

 shghtly reddish when contracted. On the inner side of the ring- 

 canal, near the velum, the marginal vesicles are situated, eight in 

 number, alternating, about midway, with the radial canals. The 

 velum is broad. 



An abnormal specimen was taken on 2.5th April, 1895. It had 

 seven radial canals, seven gonads, and seven marginal vesicles. 



Distribution. Heligoland, Hartlauh. 



Scotland— Shetland Islands, Forhes ; St. Andrews, M'Intosh, 

 Crawford. 



Ireland — Valencia Island, E. T. B. 



Bibliography. 



Agassiz, a. 1865. North American Acalephae. (Cambridge, 



Mass.) 

 Agassiz, L. 1862. Contrib. Nat. Hist. U.S.A., vol. iv. (Boston.) 

 Allman, Gr. J. 1867. "■ On Slabheria." Brit. Assoc. Eep. p. 77. 

 Allman, G. J. 1871-72. Monogr. Gymu. Hydroids. Bay Soc. 



(London.) 

 Allman, G. J. 1873. " On some Kecent Kesults with the towing- 



net on the South Coast of Ireland." Nature, vol. ix. 



pp. 73-74. 

 Brooks, W. K. 1895. " The Sensory Clubs or Cordyli of Laodice." 



Journ. Morph. vol. x. pp. 287-304, pi. xvii. (Boston.) 

 Browne, E. T. 1896. " On British Hydroids and Medusis." 



Proc. Zool. Soc. pp. 459-500, pis. xvi. & xvii. (London.) 

 Claus, C. 1881. "Ueber JEquorea forskalea." Arbeit. Zool. 



Instit. Wien, Bd. iii. 

 Crawford, J. H. 1891. "Notes on Medusae of St. Andrews 



Bay." Ann. Nat. Hist. ser. 6, vol. viii. pp. 295-297. 

 Forbes, E. 1818. Brit. Naked-eyed Medusa. Bay Soc. 

 Eorbes, E. 1851. " On ^quorea." Proc. Zool. Soc. pp. 272-275, 



Bad. pi. iv. (London.) 

 Gegenbaur, C. 1856. "Versuch Syst. Medusen." Zeitschr. 



wiss. Zool., Bd.viii. pp. 202-273, Taf. vii.-x. 

 Haddon, a. C. 1885. " On the Fauna of Dublin Bay." Proc. 



Eoy. Irish Acad. ser. 2, vol. iv. pp. 523-531. (Dublin.) 

 Haeckel, E. 1864. "Beschr. Medusen Golfe von Nizza." Jena. 



Zeitsch. Naturw., Bd. i. pp. 325-342. 

 Haeckel, E. 1879. Das System der Medusen. (Jena.) 

 Hartlatib, C. 1894. " Coelenteraten Helgolands." Arbeiten 



biol. Anstalt Helgoland (1893), Bd. i. pp. 161-206. (Kiel.) 



