| OCR Text |
Show 1896.] BRITISH HYDROIDS AND MEDUSA. 475 Haeckel gives Corymorpha nana, Alder, as the hydroid belonging to Euphi/sa aurata. I a m still of the opinion that this is not the ri<dit hydroid, as the medusae are quite distinct. DISTRIBUTION. Mediterranean, Haeckel. Atlantic, about 50 miles N . W . of Scotland, Maas. Scotland-Shetland Islands, Forbes. St. Andrews, Holt; Crawford. England-Isle of Man, Browne. Ireland-Valencia Island, E. T. B. Fam. TIAEIDJE. AMPHINEMA DINEMA (Peron et Lesueur). Oceania dinema, Peron et Lesueur (1809) ; Eschscholtz (1829). Diancea diadema, Lamarck (1817). Campanella dinema, Blainville (1834). Saphenia dinema, Forbes (1848); Peach (1849) ; Cocks (1849). Saphenia titania, Gosse (1853). Stomotoca dinema, Agassiz (1862). Amphinema titania, Haeckel (1879) ; Garstang (1894). At Plymouth I found this species fairly abundant during September 1893. Many of the specimens wdiich I took were immature, about 1 m m . in length. One specimen measured 3 m m . in length and 2 m m . in width. The tentacles of this medusa are able to expand to a great length, often to ten times tbe length of the umbrella. The larger specimens have about two dozen minute marginal bulbs. Stomach yellowish brown. The base of the tentacles is of a crimson or purplish colour. I again took a few specimens at Plymouth during September, 1895, but not so many as in 1893. DISTRIBUTION. Scotland-Shetland Islands, Forbes. England-Portland, Forbes. Plymouth, Garstang; E. T. B. Cornwall, Forbes. Fowey, Peach. Falmouth, Cocks. Hfracombe, Gosse. Fam. MARGELLIDJE. LIZZIA BLONDINA, Forbes. Lizzia blondina, Forbes (1848); Peach (1849); Haeckel (1879); Mcintosh (1890); Vallentin (1893); Browne (1895). Lizzia claparedei, Claparede (I860); Haeckel (1879). Bysmorphosa minima, Haeckel (1879); Browne (1895). The specimens taken at Plymouth in 1893 and 1895, and at Valencia in 1895, clearly show that the earliest stage is similar to the medusa described by Haeckel as Bysmorphosa minima. The chief difference between Bysmorphosa minima and Lizzia blondina exists in the number of tentacles, which increase in number during the growth of the medusa. Bysmorphosa minima has four single perradial tentacles and four single interradial tentacles. |
