1907.] 



Records of the Indian Museum. 



289 



The hydranths are claviform when contracted and totally 

 devoid of tentacles ; their cavities are lined by a special layer of 

 pavement epithelium, and they contain well-developed muscle- 

 Qbres among the endoderm. 



The gonophores are closed sporosacs, without radial canals 

 tentacles, or ectodermal invaginations. 



The species is parasitic on the skin of a surface-swimming fish 



1. Johnstone, J. 



2. Bronn, H. G. 



3. Fewkes, J. W. 



4. Collcutt, M. C. 

 5- Alcock. A. 



6. Allman, G. J. 



REFERENCEvS. 



. . "Report on the Marine Fishes," 

 Herdman's Ceylon Pearl Oyster 

 Fisheries and Mar. Biol., pt. ii, 

 1904, p. 203. 



. . Klassen und Ordnung. des Thier- 

 Reichs, bd. ii, abt. 2, 1889-92, p. 

 217. 



. . ''On certain Medusae from New Eng- 

 land," Bull. Mus. Comp. Zool., 

 vol. xiii, 1887, p. 224. 



. '' On the structure of Hydractinea 

 echinata," Quart. Journ. Micros. 

 Sci., vol. xl, 1898, p. 88. 



. " A case of commensalism between a 

 Gymnoblastic Anthomedusoid 

 (Stylaciis minoi) and a Scorpse- 

 noid Fish (Minous inermis)," 

 Ann. Mag. Nat. Hist., ser. 6, 

 vol. X, 1892, p. 207. 



. Monograph of the Gymnoblastic Hy- 

 droids, 1871, p. 128. 



