MARINE AQUARIA 



Coral; Agaricia agaricites, the Fungus Coral; and Millepora alcicornis, 

 the Finger Coral or Sea Ginger. These corals cleared of the polyps may 

 be obtained adhering to the rocks upon which they grew, or may be 

 fastened with hydraulic cement in desired localities In the aquarium. 



Vermes or Worms and Leeches. The marine forms occur in mud 

 and sand, under stones and in rock crevices, crawling over the weeds and 

 the bottom; or, either free or attached, in tubular cases, or sometimes 

 attached to other animals. The Platyhelminths are principally flat worms, 

 the Nemertinea thread-worms, the Nemathelminths round-worms, and 

 the Polychseta many-bristled-worms; the Annulata ringed worms, and the 

 Sedentaria tubicolous or pipe-worms. With but few of these we are con- 

 cerned. Elsewhere the Trematoda, internal and external parasitic, and the 

 Cestoda, strictly internal parasitic worms are mentioned. 



Nemertina. These long and slender marine worms are generally dis- 

 tributed between tide-marks and are from ^ inch to many feet in length 

 and exceedingly contractile. Some will survive in confinement. The 

 most generally species are: 



Nemertes socialis, color black or brown, slender slightly flattened, 5 

 to 6 inches long when extended, with four eyes on each side of the head; 

 and N. viridis, color olive-green or brown, rather thick, slightly flattened, 

 6 to 8 inches long when extended; eyes black in two rows. Both com- 

 mon under stones, etc., in shallow water. 



Tetrastemma arenicola, color dark-pink or purple, slender, cylindrical, 

 4 to 5 inches long when extended, head changeable In form, neck slightly 

 constricted. Common in sand and mud at low water marks. 



Cosmocephala ochracea, color grey or yellowish-white and mottled, 2 

 to 3 inches long when extended, rather stout and cylindrical. Common 

 on low-water-marks, usually in empty shells. 



Polinaglutinosa, color orange or light-yellow, eyes numerous In oblique 

 lines on head, 2 to 3 inches long when extended, usually on algae and 

 woodwork. 



This group of worms will not long survive in aquaria together with 

 other animals. 



Sedentaria. These tubicolous marine worms make interesting aquarium 

 studies as they construct tubes of grains of sand, seaweeds and particles of 

 shell by mucus secretions; other secrete calcareous matter which forms 

 hard cases. All have the anterior portion more developed than the pos- 

 terior end of the body. The most general and interesting are: 



Amphitrite ornata, color red or brown, 8 to 1 2 inches long, with three 



pairs of plumelike gills and many flesh colored tentacles at the head, 



.which are constantly in motion. The tubes are ^ to ^ inch in diameter, 



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