ANTHOMEDUS.E FTERONEMA, ELEUTHEHIA. 



93 



however, too vague to be of service, and his figure 5' is almost equally hopeless. The spherical 

 bell is apparently turned inside out, and there are 4 short, feathered, marginal tentacles and 

 a flaring, conical manubrium, the tentacles and manubrium being bright yellow. His figure 

 5 is even worse for purposes of identification. I advise the dropping of Lesson's medusa 

 from future lists, for it will doubtless be impossible to determine it even generically. 



In Haeckel's medusa the bell is 6 mm. high, 4 mm. wide, pyriform with a pointed 



conical apex. There are no longitudinal lines of nemato- 

 cysts over the exumbrella. There are 4 radially placed 

 marginal tentacles, longer than the bell-height, and each 

 provided with an abaxial row of filiform side branches, 

 each one of which terminates in a spear-head-shaped 

 capsule containing 5 to 10 nettle-cells. The basal bulbs 

 of the tentacles are conical and lack ocelli. There are 4 

 straight, wide, jagged edged radial-canals and a narrower, 

 smooth edged circular vessel. The stomach is spindle- 

 shaped, halt to two-thirds as long as the depth of the 

 bell-cavity, and provided with 4 simple lips. Gonads ( ?) 

 on the adradial sides of the stomach. 



The distinguishing characteristic of this medusa is 

 the elongate, spindle-shaped brood-pouch above the 

 stomach in the gelatinous apex of the bell. Haeckel 

 observed ripe eggs and gastrulae in this brood-pouch. 

 The anatomical relationships between this brood-pouch 

 and the stomach are unknown, and it may have no con- 

 nection with the stomach, but be ectodermal and con- 

 nected with the subumbrella epithelium as it is in 

 Eleutheria, Haeckel's description affords no solution of 

 this problem. Color ( ?) Coast of Australia. Exact local- 

 ity unknown. A single specimen described by Haeckel. 



Genus ELEUTHERIA Quatrefages, 1842. 



Elcufhcriti, (Ji'ATRKFAr.Es, 1842, Compt. rend. Acad. Set., Paris, tome 15, p. 

 168; 1842, Annal. des Sci. Nat., serie 2, tome 18, p. 270. 



Clavatella (hydroid and medusa), HINCKS, 1861, Annals ami Mai:. Nat. Hist., 

 scr. 3, vol. 7, p. 73. 



Elfutheria, KROHN, 1861, Wiegemann's Archiv. fur Natures., Jalirj;. 2-, Bd. 

 i, p. 157. CLAPAREDE, 1863, Beobacht. iiber wirbrllose ThiYre, p. 4. 

 ALLMAN, 1872. Monog. Tubul. Hydroids, p. 384. HAECKEL, 1879, 

 Syst. der Medusen, p. io<;. HARTI-AVK, 1886, Zool. Anzeiger, Bd. 9, 

 p. 707; Ibid., 1887, Bd. 10, p. 652; Iliiil., Bd. 12, p. 665, 1889; 1907, 

 NorJisches Plankton, Nr. 12, p. 126. BROWNE, 1902, Annals and 

 Mag. Nat. Hist., ser. 7, vol. 9, p. 279. GUNTHKR, 1903, Mitt. Zool. 

 Sta. Neapel, Bd. 16, p. 57. KRVMBACH, 1907, Zool. Anzeiger, Bd. 

 3 1, p. 450. 



FIG. 45. Ptcronema danvinii, after 

 Haeckel, 1879. 



The type species of this genus is the extremely v.i li- 

 able Elfutheria dichotoma of the Mediterranean and 

 Atlantic coasts of Europe. Haeckel, 1879, p. 106, records 12 subspecies of this medusa. Tin- 

 best description is by Hartlaub, 1886, 1907. 



GKNKRIC CHARACTERS. 



Cladonemidae with 4 or more simple radial-canals and an equal number <>t biturcated 

 tentacles. Terminal branches ot tentacles end each in a knob-like. cluster of nemntocysts. 

 Manubrium a simple, 4 or more sided tube without oral tentacles or prominent lips. Velum 

 well developed and there is an urticating ridge around the exumbrella side of the hell-margin 

 below the ring-canal. There is a peculiar brood-pouch above the stomach, but this pouch is 

 not connected with the gastrovascular cavity of the medusa. The cavity of this brood-pouch is, 

 however, connected with the bill-cavity by means of simple, interradial openings. The genital 

 products are developed exclusively in the epithelial lining of this brood-pouch, which is dei i\ i-d 



