164 



CEYLON PEARL OYSTER REPORT. 



Maas, 0. 1904. "Revision des Meduses appartenant aux Families des Cunanthidse et des iEginidae, et 

 groupement nouveau des genres." ' Bull. Mus. Oceanographique de Monaco,' No. 5, 8 pp. 



Mayer, A. G. 1900. "Some Medusae from the Tortugas, Florida." 'Bull. Mus. Comp. Zool. Harvard,' 

 vol. xxxvii., pp. 11-82, plates i.-xliv. 



Moser, Fanny. 1903. "Die Ctenophoren der Siboga-Expedition." ' Siboga Expedition.' Monograph, 

 xii., 34 pp., 4 Taf. 



Quoy, J. R., et Gaimard, P. 1833. " Voyage de decouvertes de 1' ' Astrolabe.' " ' Zoologie,' tome iv. 

 Paris. 



Vanhoffen, E. 1892. ' Die Akalephen der Plankton-Expedition (" National "),' Band ii., K.d., pp. 1-30, 

 4 Taf. 



Vanhoffen, E. 1902. "Die aeraspedoten Medusen der deutschen Tiefsee-Expedition 1898-1899 

 (' Valdivia ')." ' Wissen. Ergebnisse,' Band iii., pp. 1-52, Taf. i.-viii. " Die craspedoten 

 Medusen der deutschen Tiefsee-Expedition (' Valdivia ') I. Trachymedusen." ' Wissen. Ergeb- 

 nisse,' Band iii., pp. 53-86, Taf. ix.-xii. 



DESCRIPTION OF PLATES. 



All the figures were drawn from specimens in formalin or alcohol ; all sense-organs 

 and sections were drawn with a camera lucida. 



Reference Letters. 



A. Adhesive disc. 



B. Basal bulb. 

 CC. Circular canal. 

 Ec. Ectoderm 



En. Endoderm. 



Ex. Ex-umbrella. 



G. Gonad. 



M. Mesoglcea. 



N. Nematocyst. 



Oc. Ocellus. 



Ov. Ovum. 



Or. Oral lip. 



P. Peronium. 



PG. Peronial groove. 



R. Radial canal. 



S. Sense-organ. 



Sm. Septum. 



St. Stomach. 



Sip. Stomach (gastric) pouch. 



Sub. Sub-umbrella. 



T. Tentacle. 



V. Velum. 



PLATE I. 



Cyttzis herdmmi, n. sp. (p. 135). Lateral view, x 30. 

 sEquorea arnica, n. sp. (p. 145). Lateral view, x 10. 

 Mitrocomium assimile, n. sp. (p. 137). Lateral view, x 20. 

 Irenopsis hexanemalis, Goette (p. 142). Lateral view, x 10. 

 Laodice indica, n. sp. (p. 136). Oral view, x 15. 

 Gonionemus Iwrnelli, n. sp. (p. 149). Lateral view, x 10. 



