228 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



arms 190 mm. long. In a half-grown medusa (Cat. No. 27928, 

 U.S.N.M.) obtained on the surface at the same time and place the 

 bell is 59 mm. wide with finely granular exumbrella; mouth-arms, 

 67 mm. long; arm-disk, 41 mm. wide at its origin from the subum- 

 brella and 33 mm. wide at the level of the origins of the mouth-arms. 

 Two specimens (Cat. No. 28710, U.S.N.M.) are from Atulayan 

 Bay, east coast of Luzon, June 17, 1909. Of these the larger one was 

 cut into two pieces when viewed by me, but the bell appears to have 



been about 106 mm. 

 in diameter, the 

 mouth - arms being 

 167 mm. long, the 

 upper arm 20 mm., 

 and the lower arm 

 147 mm. long. 



A color note leads 

 one to infer that in 

 life the bell was 

 translucent with a 

 slightly brownish 

 margin, and with 

 the frilled mouths 

 dark burnt -umber. 

 The smaller speci- 

 men when alive had 

 a translucent bell 

 with some whitish 

 spots and with eight 

 indigo streaks along 

 the eight principal 

 radii. The frilled 

 mouths and bell- 

 margin were pale brown. One specimen (Cat. No. 28711, U.S.N.M.) 

 91 mm. in diameter with mouth-arms 155 mm. long, is from Station 

 D2268, September 21, 1909, depth 13 fathoms off Singaan Island 

 north of Tawi Tawi. In this the arm-disk is 59 mm. in perradial 

 diameter, and the upper arms are 13 and the lower 142 mm. long. 



Genus LORIFERA Haeckel, 1880. 



Himanostoma preoccupied for Diptera by Loew, 1853. 

 Himana stoma Agassiz, L., 1SG2, Contr. Nat. Hist. U. S., vol. 4, p. 152. 

 Lorifera Haeckel, 18S0, Syst. der Medusen, p. 028. — Mayer. 1910, Medusae 

 of the World, vol. 3, p. 693. 



Generic Characters. — Rhizostomata lorifera in which the eight 

 mouth-arms bear rows of frilled mouths throughout their lengths but 



Pig. 24. — Thysanostoma thysanura from Panabutan 

 Bay. A, Oral view of the 8 mouth-arms being re- 

 moved. B, Cross section of mouth-arm near the 

 base. C, Cross section of mouth-arm near the outer 



END OF THE ARM. D, ORAL VIEW OF RHOPALAR LAPPETS. 



E, Rhopalar lappets from the exumbrella side. 



