SCYPHOMEDUSAE COLLECTED BY STEAMER ALBATROSS. 



223 



very small appendages among the mouths of the mouth-arms. The 

 mouth-arms are strongly compressed laterally. A single duct extends 

 down each mouth-arm and gives rise to four terminal branches, two 

 to the lateral wings and two to the triangular extremity of the arm. 



There are eight wide rhopalar radial canals, of which the four 

 perradial ones rise directly from the stomach ; but each of the 4 inter- 

 radial arise from the confluence of a Y-shaped fork. Seven to nine 

 narrow radial vessels arise in each inter rhopalar octant and extend 

 outward anastomosing profusely with each other and with the eight 

 rhopalar canals. There is no definite ring-canal. 



A wide, entire, annulus of circular muscles is found in the sub- 

 umbrella, but there are no radial muscle strands. This muscular zone 



■v-Q^lCn- 



Fig. 21. — Veesura maasi from Mantacao Island, west coast of Bohol. A, Oral 



VIEW. B, A CLUB FROM THE MOUTH-ARMS, MUCH MAGNIFIED. C, A MOUTH-ARM SEEN 

 FROM THE OUTER (ABAXIAL) SIDE. D, EXUMBRELLA VIEW OF ONE OF THE MARGINAL 

 SENSE ORGANS. 



is wider in the interradii than in the perradii, and is somewhat 

 thinned but still unbroken in the eight rhopalar radii. 



In formalin the rhopalar canals, and all vessels near the stomach, 

 are bluish purple. The mouth-frills are brownish to brownish purple. 

 The bell is milky and the gonads dull brownish yellow. 



Genus LOBONEMA Mayer, 1910; sensu Light, 1914. 



Lobonema Mayeb, 1910, Medusae of the World, vol. 3. p. 638. — Light. 

 1914, Philippine Journ. of Science, vol. 9, p. 216. 



Generic Characters. — Rhizostomata triptera in which the marginal 

 lappets are greatly extended, tapering to pointed ends. These lappets 

 are noncontractile and lack muscles. Mouth-arms with numerous 

 filaments. Mouth-arm membranes perforated by windowlike open- 

 ings. Eight to sixteen rhopalia and twice as many radial-canals, and 

 a ring-canal which gives off anastomosing vessels on both its inner 

 and outer sides. The inner network does not connect with the stom- 



