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84 Mr. Thompson on the Mollusca of Ireland. Species unica. Aphanizomenon incurvum, Nobis, vid. tab. fig. 1 — 12. Lamella plana, alba-viridi, incurva, Jilis coadnatis, articulis 2 — 8 duplo longiorihus, discretis, cceruleo-viridibus . Habitat infossis et stagnis aquts dulcis in Flandria, mense Maio ad Julivm. " II est Evident que ce genre lie les conjugees vrais aux zy-gnemees, par un accouplement bien prononce chez ces derniers, mais devenant une simple soudure chez les aphanizomhnes, II met en rapport les conjugees avec les laminaires des eaux ma-rines, par la forme de la lamelle qui resulte de la soudure des filets. II etablit une analogic entre les oscillariees et les con-fervees, en demontrant qu'un mouvement de reptation, de na-tation ou d^oscillation, pent appartenir aussi bien a I'organi-sation des conferves qu'a celle des oscillatoires, dans lequels on croit reconnaitre les caracteres de Panimalite. Les vesi-cules renflees ramenent Vaphanizom^ne a la Conferva vesicata d'Agardh, et les articles, comme I'organisation des filets elle-meme, lui conservent avec les confervces vrais des rapports si clairs, qu^il serait Kors de propos de placer ailleurs que parmi elles ce genre nouveau." 1. Appearance of Anahaina spiralis under alow power of microscope. 2. Its appearance considerably magnified — when consisting of this number of spiral folds ^V <^f ^^ inch in length. 3. Different appearance of granules as noted in 3. description on Sept. 27. XI. — Contributions towards a knowledge of the Mollusca Nudibranchia and Mollusca Tunicata of Ireland, with De-scriptions of some apparently new Species of Invertebrata, By Wm. Thompson, Esq., V.P.N. Hist. Society of Belfast. [With a Plate.] Mollusca Nudibranchia, Cuv. Doris tuberculata, Cuv. Johnst. Ann. Nat. Hist. vol. i. p. 50. pi. 2. fig. 1. D, argo, Penn. In the late Mr. Templeton's Journal, " Doris argo, Penn., Brit. Zool. p. 22," is mentioned as twice found by him in

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XI.—Contributions towards a knowledge of the Mollusca Nudibranchia and Mollusca Tunicata of Ireland, with descriptions of some apparently new species of invertebrata

Annals And Magazine of Natural History 5: 84-102 (1840)

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