604 MEDUS-t; OF THE WORLD. 



upon the exumbrella and y cKnihlc lappets per octant, 144 in all. In Antipa's specimens from 

 the Guli" of Smyrna, Meditci lancan, the radial tiirrovvs had increased to be 144. and thus 

 corresponded in number with the lappets. Uaeckel's specimens had only 80 termuuil gastric 

 canals, while Antipa's specimens had 144. 



The following; is a description of Antipa's specimens, these being the more mature: 

 Bell flatly rounded, shield-shaped, 500 to 1,000 mm. wide, 144 radial furrows on the 

 exumbrella, and between them 144 marginal lappets. 8 marginal sense-organs in deep niches. 

 4 perradial, veil-like oral palps, each ending in 2 points, and thus the palps have 8 adradial 

 points. These palps are more than 1.5 times as long as the disk-radius and their outer edges 

 are complexly folded. The numerous tentacles arise froin the tniddle zone of the subumbrella, 

 halfway between the center and margin line, and are 3 to 6 times as long as diameter ot the bell. 

 There are 4 interradial protruding horseshoe-shaped gonads. Mouth-opening wide. Wall 

 of mouth-tube thickened at 8 subradial places. The 16 stomach- pouches terminate in 144 

 dichotomous ramuli (128 tentacular and 16 ocular). Color reddish-white (pink?). Gulf of 

 Smyrna, coast of .^sia Minor, Mediterranean; Trieste, Adriatic Sea, GraefFe; Straits of 

 Gibralter (?) Haeckel. 



Drymonema gorgo F. Miiller. 



Drymonema gorgo, MOller, F., 1883, Zool. Anzciger, Jahrg. 6, p. 220. 



The disk is 20 to 500 (usually 300) mm. wide. "Mouth-arms" or palps longer than 

 diameter of umbrella, whereas they are only about half as long as this in D. dalmatina. The 

 8 ocular stomach-pouches fork once, thus giving 16 marginal diverticula as in D. dultuatnia. 

 The 8 velar stomach-pouches branch dichotomoush- 4 times, as in the mature D. duliuatnia, 

 but the fifth, sixth, eleventh, and twelfth branches in D. gorgo branch dichotomously a fifth 

 time, and thus each of the 8 ocular stomach-pouches gives rise to 20 terminal branches in 

 the lappets. There are thus 8X20-1-16=176 dichotomous terminal gastrovascular canals in 

 D. gorgo and only 8X 16+ 16 = 144 in D. dalmatina. 



Found at St. Catharina Island, coast of Brazil. Rare. 



This ma\' prove to be a variety of D. dalmatina. 



Genus (?) PATERA Lesson, 1843; DONACOSTOMA L. Agassiz, 1862. 



Paiera, Lesson, 1843, Hist. Zooph. Acali-phes, p. 322. — Haeckel, 1880, Syst. dcr Mcduscn, p. 533. 



(?)A/?/u5mrt, Haeckel, 1880, /oc.cif., p. 534; 1 881, Report Deep-sea Medusce Challenger Expedition,ZooL, voL 4, p. 1 (abandoned 



by Haeckel himself). 

 (.^) Donacostoma, Agassiz, L., 1862, Cent. Nat. Hist. U. S., vol. 4, pp. 118, 163. 



The type species of this problematic genus is Patera cerebrifomus, first described as 

 Diancea cerebriformis by Lesson, 1 829. Voyage de la Coquille, Zooph., p. 124, planche 10. 

 The description and figure are evidently so inaccurate as to be all but worthless. Diamra, 

 Lamarck, 1816 (Hist. /\nim. sans Vert., tome 2, p. 504), is a s\nonMTi oi Geryonia. 



GENERIC CHARACTERS. 



Cyaneidce which are said to have 16 rhopalia. 16 clusters of tentacles arise from the 

 subumbrella alternating in position with the sense-organs. Agassiz's Donacostoma has only 

 8 rhopalia, but 16 rows of tentacles. 



Patera cerehriforrjils is said to come from near the Cape Verde Islands, tropical Atlantic; 

 and another species Donacostoma zcoodti L. Agassiz, 7862 (Cont. Nat. Hist. U. S., vol. 4, pp. 

 118, 163), is from the China Sea, and is said to have 8 "eyes," but with 16 branches of 

 tentacles like Patera, arranged in a single row in each lobe. Neither is well enough known 

 to be worthy of description here, and indeed it is possible that both belong to the genus Dry- 

 monema or even to Cyanea itself. 



Family ULMARID/E Haeckel, 1880, sens. ampl. 



FlQiculida+Vlmaridtr, Haeckel, 1880, Syst. der Mcduscn, pp. 535, 539. 

 Ulmartd(t,\A^H'6m.s, 1906, Nordisclics Plankton, Nr. 11, p. 56. 



FAMILY CHARACTERS. 



Semseostomese with simple or branched radial-canals and a ring-canal. W'itli hollow 

 tentacles. 4 interradial gonads. 4 mouth-arms with folded, curtain-like margins. 



