108 



MEDUS.E OF THK WORLD. 



spur-like projection extending outward. There are no ocelli. All ot the tentacles were broken 

 off short and their normal length is thus unknown. 



The ring-canal gives off a short, straight, blindly-ending diverticulum in one ot the 4 

 interradii above the base ot one of the interradial tentacles. 4 wide radial-canals as in other 

 Tiarinae. They are straight-edged and lack the "glandular-pouches" seen in many Tiarmae. 



The circular muscles ot the subumbrella are very easily seen near the edges ot the radial- 

 canals and there are 4 interradial folds in the muscles which present the superficial appearance 

 of radial-canals, but they are merely radial muscle furrows, in no way to be confused with the 

 radial-canals. 



The manubrium lacks a peduncle and is about halt as long as the depth ot the bell-cavity. 

 It is 4-sided at its base. The stomach part is urn-shaped, and thereare4toldedhps. Gonads( ?) 

 The tentacle-bulbs bear dense entodermal pigment granules. Color ( ?) 



Two specimens were found by the Siboga expedition in the Malay Archipelago in vertical 

 nets drawn from 500 fathoms depth to the surface, in lat. o 17.6' S., long. 129 14.5' E. 



It is remarkable that in each of these specimens there was but one interradial diverticulum 

 from the ring-canal. 4 interradial swellings are figured by Maas upon the sides of the 

 stomach, but he does not mention gonads. Apparently both of his specimens were immature. 



FIG. 57. " Perigonimus vestutus" Hydroid and recently 



liberated medusa. 

 FIG. 58. "Perigonimus m'mutus" Hydroid and young 



medusa. 

 Above figures after Allman, in Ray Society, 1871-71. 



Genus STOMOTOCA L. Agassiz, 1862. 



( ?) Glatide bcroe, SLABBER, 1775, Physikal. Belustig., p. 46. 



Saphenia, FORBES (non Eschscholtz), 1848, British Naked-eyed Medusa-, p. 25, plate I, fig. 4. McCRAnv, 1 857, Gymn. Charles- 

 ton Harbor, p. 27. 



Stomotoca, AGASSIZ, L., 1862, Cont. Nat. Hist. U. S., vol. 4, p. 347. A. AGASSIZ in L. AGASSIZ'S, 1862, Cont. Nat. Hist. U. S., 

 vol. 4, p. 347 (foot-note). AGASSIZ, A., 1865, North Amer. Acal., p. 168. 



Dinema, VAN BENEDEN, 1867, Mem. Acad. Roy. des Sci. Belgique, torn. 36, par. i, p. 127. 



Amphinema+ Stomotoca, HAECKEL, 1879, Syst. der Medusen, pp. 49, 51. 



Codonorchis, HAECKEL, 1879, Ibid., p. <;i. 



Dinemaiella, FEWKES, 1881, Bull. Mus. Comp. Zool. at Harvard College, vol. 8, p. 151. 



Stomotoca, VANHOFFEN, 1891, Zool. Anzeiger, p. 443. MAAS, 1897, Mem. Mus. Comp. Zool. at Harvard College, vol. 23, 

 No. I, p. II. 



This genus was founded by L. Agassiz, 1862; the oldest species is possibly Stomotoca 

 slabbcri of the northern coasts of Europe. This species was first described by Slabber, i/75> 

 under the name of Gladde beroc, and the hydroid and young medusa were described by Van 

 Beneden, 1867, as Dinema slabberi. Slabber's description is, however, so unsatisfactory that 

 we can not be certain that this medusa is actually a Stomotoca, and can not accept it as the 

 type of the genus. Stomotoca Jincma (Oceania Jincma} Peron and Lesueur may be taken as 

 the type of the genus. The genus Saphenia Eschscholtz belongs to the Eucopidae. 



