MARINE AQUARIA 



(Ver.), Is similar to the above. This genus has one other Middle At- 

 lantic coast parasitic form and four species north of Cape Cod. 



Ammophilactis rapiformis, (Ver.), has a 3-inches long column sur- 

 mounted with a 1% inches diameter disc, with 144 tentacles in a crowded 

 circle. The colors are variable, but incline to pinkish and bluish tones. 

 Found in tide-pools from Cape Cod to Cape Hatteras. 



Cylista leucolena, (Ver.), has the 2^ to 3 inches long cylindrical, trans- 

 lucent column usually rose-colored and covered with scattered wartlets. 

 The disc is simple and thin and the 96 slender, crowded tentacles are 

 placed in five rows on the margin of the yi inch diameter disc. The ten- 

 tacles are pinkish- and whitish-grey, darkest in color at the disc ; and in 

 size are twice as long as the diameter of the extended column. Common 

 from Cape Cod to North Carolina on submerged woodwork and under 

 stones. 



Sagartia lucia, (Ver.), is a small ^ to ^^^ inch high and J^ inch diam- 

 eter polyp, having 84 tentacles in four rows, of which the central are the 

 longest. The colors are bright but variable. Found from Cape Hatteras 

 north. Another form, S. pustulata, (McMur.), has the ^ inch column 

 broken by longitudinal and transverse furrows. The y^ inch diameter 

 disc has 64 long tentacles arranged in four rows. Found in the same lo- 

 calities, often associated with the above. Other shallow- and low -water 

 forms are S. gracillima, having a i-inch column and 48 tentacles, and S. 

 modesta, very similar in form to C. leucolena, but smaller and having a few 

 hairy excrescences on the column. 



Parasitic Anemones. This interesting group contains a number of 

 species which attach themselves to the shells of hermit crabs, whelks and 

 other animals, probably on account of the change of location they afford, 

 and they in their turn aid as a disguise to the animals with which they 

 are associated. There are a number of American forms which have this 

 habit, among them some of those already described, which are the mo^e 

 generally distributed forms. 



GoRGONACEA, the family of the Sea-fans, Sea-whips and Sea-feathers; 

 and Pennatulacea, the Sea-pens, are colonies of polyps closely united 

 about a horny axis, which resemble miniature trees and branches covered 

 with a coating of animal matter. None of these survive in the aquarium. 



Madropores, the family of the Branch and Reef Corals, also cannot 

 be kept alive in smaller aquaria and further mention of them is omitted. 

 For purposes of ornament some of the calcareous structures of American 

 Corals are desirable, especially those of the Florida reefs. These are 

 Gorgonia flabellum, the Sea Fan; G. cervicornis, the Stag-horn Coral; 

 Meandrina labyrinthiformis, the Brain Coral; Orbicella annularis, the Star 



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