ANTHOMEDUS^E DICODONIUM, SARSIA. 47 



projects upward from the stomach into the gelatinous substance of the apex of the bell. 

 This is probably only the remnant ot the connection between the medusa and its hydroid 

 stock. The gonad is ring-like, and encircles the stomach, leaving the short proboscis free. 



The entoderm of the tentacles and tentacle-bulbs is of a delicate green or pink. The 

 entoderm of the stomach is creamy pink. The ocelli are bright-red, and all other parts are 

 colorless. 



This medusa is quite common at the Tortugas, Florida, in May and early June. Although 

 small, it appears to be mature, for sperm is often given off from the gonad of the males. 



Dicodonium adriaticum Graeffe. 

 Dicodonium adriaticnm, GRAEFFE, 1884, Arbeit. Zool. Inst. \Vien, Bd. 5, p. 551. 



Bell 4 mm. high, 3.5 mm. wide, bell-shaped, with a small, conical, apical projection. 

 2 long, radially placed tentacles, more than 12 mm. long, with large, thick, basal bulbs, each 

 with a large carmine ocellus upon the abaxial side of the bulb. 2 tentacle-bulbs at the bases 

 of the 2 radial-canals 90 away from the large tentacles. These basal bulbs have small red 

 ocelli. Each of these 4 ocelli are bordered by a ring of stiff sensory hairs. There are 4 small, 

 interradial tentacle-bulbs without ocelli. Thus there are 2 long tentacles, and 6 rudimentary 

 tentacle-bulbs. 4 radial-canals. Stomach short, thick, and 4-sided, with the gonads in the 

 stomach-wall. Mouth simple, with 4 lips. Found at Trieste. Adriatic Sea, in October. 



Dicodonium dinema. 

 Sarsiclla dintma, HARTLAUB, 1907, Nordisches Plankton, Nr. 12, p. 67, fig. 63. 



Bell oval, half-egg-shaped, 3 mm. high, 2 mm. wide. Exumbrella thickly besprinkled 

 with nematocysts. Only 2 tentacles, 1 80 apart. These are longer than the bell-diameter. 

 They have small basal bulbs, each with a reddish-brown ocellus. No trace of tentacle-bulb 

 or tentacles 90 apart from the well-developed tentacles. Manubrium about 2 times as long 

 as the bell-height. Spindle-shaped and encircled throughout by the gonad. Manubrium, 

 tentacles, and 4 radial-canals brownish-yellow. Found off the coast of Norway and in the 

 Mediterranean ( ?) Is this an abnormal young Sarsia with only 2 tentacles ? Hydroid 

 unknown. Medusa rare. 



Genus SARSIA Lesson, 1843. 



Sarsia, LESSON, 1843, Hist. Zooph. Acal., p. 333. AGASSIZ, L., 1849, Mem. Amer. Acad., New Scries, vol. 4, p. 224; 1862, Cont. 

 Nat. Hist. U. S., vol. 4, p. 211. WAGNER, 1885, Wirbellosen des Weissen Meeres, p. 76. VANHOFFEN, 1891, Zool. 

 Anzeiger, Bd. 14, p. 442. HARTLAUB, 1897, Hydromedusen Helgolands, p. 454; 1907, Nordisches Plankton, Nr. 12, 

 p. 7. VON LENDENFELD, 1884, Proc. Linnean Soc. New South Wales, vol. 9, p. 582. CHUN, 1895, Bibliothcca Zoologica, 

 Bd. i, Heft. 19, p. 4. GOETTE, 1904, Zool. Anzeiger, Jahrg. 27, p. 473. 



Coryne + Syndictyon, AGASSIZ, A., 1865, North Amer. Acal., p. 175. 



Coryne (hydroid), CALKINS, 1899, Proc. Boston Soc. Nat. Hist., vol. 28, p. 336. 



Codonium + Sarsia + Svndictvon, HAECKEL, 1879, Syst. der Medusen, pp. 13, 16, 20. 



Syncoryne, WEISMANN, 1883, Entsteh. Sexualzellen Hydromedusen, pp. 56, 216. 



Syncoryne (hydroid), HARTLAUB, 1905, Zool. Jahrbuchern, Suppl. 6, p. 524. NUTTING, 1901, Proc. Washington Acad. Sci., 

 vol. 3, p. 165. 



Syncoryne (medusa), HARGITT, 1904, Bull. U. S. Bureau of Fisheries, vol. 24, pp. 29, 30. 



Syncoryne, BEDOT, 1905, Revue Suisse de Zool., tome 13, p. 119 (citation of all references to 1850). 



SynJiclon, AGASSIZ, A., 1862, in L.Agassiz's Cont. Nat. Hist. U. S., vol. 4, p. 340. MAYER, 1904, Mem. Nat. Sci. Museum Brook- 

 lyn Institute, vol. i, p. 7. 



Stenyo, DUJARDIN, 1845, Annales Sci. Nat., ser. 3, tome 4, p. 257. 



The type-species of this genus is Sarsia tubulosa of the northern coasts of Europe. This 

 medusa was first described by Lesson, 1843. The hydroid form was first described by 

 Gartner, 1774, in Pallas's Eleunch. Zooph., under the name of Coryne. Ehrenberg, Sars, 

 and Allman introduced the name Syncoryne. Staurtdia producta also gives rise to a medusa 

 which can not be distinguished from Sarsia. 



GENERIC CHARACTERS. 



Codonidae with 4 long, simple, equally developed tentacles, I at the foot of each radial- 

 canal. The manubrium is tubular and surrounded by a ring-like gonad. There is an 

 ectodermal ocellus upon the outer side of each tentacle-bulb. There are no meridional 

 nematocyst-tracts upon the exumbrella. 



