[890.] NEW-YORK MICROSCOPICAL SOCIETY. 79 



FUNGI AFFECTING FISHES.— AN AQUARIUM STUDY. 



Second Paper. Devcea. 



by samuel lockwood, ph. d. 



(^Read March 7.\st, i8go.) 



In July, 1867, appeared in the American N'aturalist a paper 

 on " The Sea Horse and its Young." The article gave my 

 observations of a male Sea Horse, Hippocampus heptagoiius 

 Rafinesque. The almost eccentric habits of this grotesque lit- 

 tle marine fish induced a strong desire for other living speci- 

 mens in order to learn more about it. In the fall of 1884, after 

 seventeen years of waiting, I obtained a fine female. It proved 

 very interesting, but died in February of the ensuing year In 

 1887, the American Naturalist contained my second paper on 

 this fish under the title : " More About the Sea Horse," from 



Description of Plate 24. 



The figures of this plate show that while the funnel pattern prevails in Devcea the 

 ra"ge in variation of the type is great. 



Figs. 1, 6, 7, 9, 10, 14, 15, 17, 19, 20, 31, 32, 35 show this sporangiform plant or 

 thallus, with its cap or operculum. The extremes of form of the cap appear in 



14 and Jr. 

 3, 5, 8, 12, 27, SI, 33, 45, 51, 57, swarm-spores at different stages. 

 3, A spore-swarm lifting off the cover of the sporangium. 

 49, A spore-swarm leaving the mother-cell. These are enlarged much beyond the 



scale of the other figures. To the left is a very large spore, suggestive of an 



oospore I 

 J, A patch of thalli, of abnormal forms. To the left of 21, also in 4, IS and 28, 



are epitheloidal looking bodies, which I think are the faces of these sporan- 



goid thalli distorted by pressure, or growth crowding. 

 25, 47, Show five emptied sporangia, with sharp rims, and SJ^nmetrical forms. 

 30, 34 , Empty sporangia. The contents seem denser, hence the deeper shading. This 



feature is seen also in 11, 24, 20, 39, and in a less degree in others. 

 19, Adherent spores. Too large for zoospores. 

 6, These doubtful mycelia show the only instance of even a dubious appearance of 



rootlets. 

 The variations of form at the aperture are interesting. Figs. 23 and 4G show a 

 wide, flattish top of sporangium with small aperture. 20, 48, 51, with conical sur- 

 rounding of aperture. 30, 34, neck of aperture cyUndrical. 50, abruptly shoul- 

 dered. 25, 47, lip of aperture thin, or sharp, and excurvate. 3, 5, 54, incurvate 

 lip of aperture, the typical form. 



12, 58, Each with a quadrifid aperture. A very eccentric form. The figures are 

 magnified from 700 to 900 diameters. 



