I.KI'Tu.Ml.m S.K THAI MANT1AS. 111 1 . 1 



canals. I he manubrium is very shallow and there arc 4 prominent, crinkled lips. The 4 

 gonads are thick and cylindrical and occupy the middle regions of the 4 radial-canals. Kach 

 gonad is about halt as long as the radial-canal upon which it is situated. Coloi ' ?) This 

 medusa is found upon the western coast of Greenland. 



Thaumantias rubrum. 

 Chromalonema filmim, K> *>,, iss^, Hull. Mus. Cmnp. Xool. .11 H.irwr.l l'o]|i-j;i-, \ol. .(. \,,. s. p. ',05, lit;. 41. I'l.iii- i. 



Bell hemispherical and gelatinous substance thick. There are 12 to |f> short tentacles. 

 No lithocysts, marginal clubs, or cirri. There are 4 straight, radial tubes. Manubrium shoit 

 and there are 4 slightly crenulated lips. Gonads developed upon radial-canals adjacent tn 

 manubrium. Each gonad is about one-third as long as the radial tube upon which it is situated. 

 The ova are very conspicuous. The gonads and tentacles air i ed in alcoholic specimens. 



Found oft the New England coast by the United Stales Fish Commission in i SSo and 

 iXXi. Were, the lithocysts destroyed by preservation in alcohol '. Si/.e i : ) 



Thaumantias cellularia Haeckel. 



l.n'ldl'f ifilllLlf I/I, Af.ASSI/, A.. (Site;. Nnllll AllHT. Al.ll., ['. 12^. fit;*-. I<K. I'l 1 ', 



'nitiumiintitis telliiLii i,t, \\ \\ < kit, i S-tj, S\ >t . JIT M-,|UM-M, p. 129. Mi RBAI II .ill.t Siu AKh K, 1 90*, , \'T . '/.> >\ . s,i, . I.. ,; 

 vul. I, p. 172, plate 17, fijjs. 2-26. 



Hell thick, dome-like, about }O mm. wide, 20 mm. hiidi. About 100 tentacles \\ith wcll- 

 developed basal bulbs set closely one by the side ot the other. Tentacles about as Ion" as the 

 hell-diameter. Stomach very small and with 4 long, slender, folded lips, 5 to <i times as long as 

 the diameter of" the stomach. 4 folded linear gonads nearly as long as the 4 radial-canals 

 upon which they are developed. Stomach, gonads, and tentacle-bulbs \iolet. 



Abundant oft the Pacific coast of Washington during the summer and autumn. 



Thaumantias forbesii Haeckel. 



\ail ThaUtlltUltiai lllfunj^fi'll, I'OKIUS, iSaS, British Xakr 1-cvi-d Mi'ilu^r, p. 41), plalr I I, t|t-. ^. 



T/iiitini<iiitiii! forbeiii, HAM KM, 1X711, S\st. Jrr Mcduycn, p. 129. 



Tttrancma eucopium (young or abortive medusa r), HAKIKU, Ihi<l., p. 125, t.tf. S, fi^. i, :. 



Bell Hat, [6 mm. \vide, 5 to 8 mm. high, in tentacles longer than the bell-diameter with 

 large, globular basal bulbs, separated by wide intervals. Ocelli upon the tentacle-bulbs. 

 Stomach small, globular. Mouth with 4 large folded lips, 2 to 3 times as long as the diameter 

 ot the base ot the stomach. 4 ellipsoidal gonads upon the outer thirds of the 4 radial-canals, 

 touching the margin. Mouth and stomach light-violet. Gonads and tentacle-bulbs dark 

 violet. Ocelli black. Coast of" Norway, near Bergen, Haeckel, September, iSdg. 



Tetranema ruivpttini Haeckel, 1879, appears to be the same medusa, only X mm. wide 

 \\ith only 4 tentacles, and with 4 folded, spindle-shaped gonads over the greater parts ot the 

 4 radial-canals. Found in the Straits of Gibraltar, by Haeckel, in March. 



Thaumantias lacustris. 



Halmiimiiti lacuslris, VON KKNNLI., 1891, Sit/her. Nat. Grs. Dorpat, B.I. 't, p. :S;. 

 Hiilirifjniisrs Itifuslrn, VON KSNNKI-, Ann. anil Mag. Nat. Hist., ser. 6, vol. 8, p. 259. 



Bell about 2 to 2.5 mm. in diameter and slightly higher than a hemisphere. There are 



|f> to 24 very long tentacles with well-developed basal bulbs, which contain a simple ring of 

 pigment upon their outer (centrifugal) sides. There are no marginal am. I he velum is well 

 developed, being broad and thin. The manubrium extends horn the inner apex of the bell- 

 cavity to the level of the velar opening. It is cruciform in cross-section, with a wide proximal 

 base. The mouth is simple, with 4 small, bluntly rounded lips. The 4 radial-canals are sinuous 

 for the first three-fourths of" their length from the 4 corners ot the stomach. In the last quarter 

 ot their length, near their point of juncture with the circular tube, they are sti aight and narrow . 

 The canals are broad in the sinuous region and here the gonads are situated. Kach gonad is 

 longer than the portion of the canal upon which it is situated, and it is therefore thrown into 

 frills and twisted sinuously. The bell is hyaline or fainth velhmish. The tentacles and bell- 

 margin are slightly milkv. The gonads aie jrellowish-brown. 

 if, 



