SCYPHOMEDUSAE COLLECTED BY STEAMER ALBATROSS. 



209 



CEPHEA OCTOSTYLA (Forsk&l). 



Medusa octostyla Forskal, 1775, Descript. Anim. Itin. Orient., p. 106, No. 



18, Icon., pi. 29. 

 Cephea octostyla Mayer, 1910, Medusae of the world, vol. 3, p. 652, fig. 405. 



A number of well-preserved specimens of Cephea octostyla were 

 obtained by the following localities : 



Jolo, Philippine Islands, February 8, 1908, 1 specimen. Cat. No. 

 27906, U.S.N.M. 



Jolo Anchorage, Philippine Islands, February 13, 1908, 3 speci- 

 mens. Cat. No. 27908, U.S.N.M. 



Jolo Anchorage, Philippine Islands, March 5, 1908, 1 specimen. 

 Cat. No. 27907, U.S.N.M. 



Station 5173, Jolo, Philippine Islands, March 5, 1908, 9 specimens. 

 Cat. No. 27910, U.S.N.M. 



"<Vi%M ?5~ 



m^pi 



■#>• i • ■•■■■ . i ii )>«&$ 



.'•x-s ;, : .;;.; v , 



Fig. 13. — Cephea octostyla from Jolo Anchorage, Philippine Islands. A, B, and 



C, Variations in the development of the central warts of the exumbrella. 



D, Rhopaliom from the subdmbrella side. 



Bell 90 mm. wide, exumbrella flat, rim vertical, 20 mm. high. 

 Near the center of the exumbrella there is a zone of numerous low 

 wart-like protuberances, leaving the exact center smooth. Eight 

 rhopalia without ocelli and without sensory pits. Seven velar and 

 two ocular lappets in each octant, all similar each to each and in- 

 distinct rectangular in outline and separated by very slight indenta- 

 tions spanned by a web. Fairly deep grooves extend up the vertical 

 rim of the exumbrella surface of the bell between the lappets. 



Arm disk as wide as the bell radius. At its center 4 to 12 or more 

 tapering, somewhat flattened, wart-covered filaments about one- 

 fourth as long as the bell diameter. Each filament terminates in a 

 simple, slender, pointed end. There are also numerous simple short 

 filaments ranging from 15 to 5 mm. in length near the center of the 

 arm disk, and in addition many still shorter arms between the 

 numerous frilled mouths of the mouth arms. 



Four small subgenital ostia and a unitary genital cavity. Ring 

 muscles of subumbrella entire, but weakly developed. Eight rhopa- 



101825°— Bull. 100—17- 



-14 



