ANTHOMKnrS.E MARGKLOPSI.S, l'KI.A( ;< iin I'll \. 



83 



The entoderm of the four large tentacle-bulbs is dull-yellow. There are no ocelli. The 

 entoderm of the manubrium was dull-\'ellow in two medusx, and dull-green in another. The 



J O 



difference is not a sexual one, however, for one ot the males was yellow while the other \\as 

 dull-green. The two yellow-colored medusa; were found, one in Oregon Inlet, Pamlico 

 Sound, North Carolina; and the other at Southport, Cape Fear, North Carolina, in Novi-mln-r. 

 The green-colored male (plate 9, fig. 4) was found in Beaufort River, at Beaufort, South 

 Carolina, on December 24, 1903, 12 miles from the ocean, in brackish water. 



McCrady, 1857, presents a good figure of that which is probably the free-floating hydroid 

 of this species. The hydroid is pear-shaped with a hollow cup-like projection from its broad 

 aboral end. There are 2 whorls of tentacles, a circlet of about 8 tentacles around the broadest 

 zone near the aboral end and a circlet of about 6 tentacles near the mouth. A number of 

 medusa-buds develop from the sides of the hydranth in the middle region between the 2 

 circlets of tentacles. When set free the medusae have 4 short tentacles in each radial cluster. 

 A single specimen was found by McCrady in Charleston Harbor. The cup-shaped projection 

 from the aboral end of the hydranth is a feature which recalls the pneumatophore of the 

 Siphonophorae. 



Genus PELAGOHYDRA Dendy. 



Pelagohydra, DENDY, 1903, Quart. Journ. Microscop. Sci., vol. 46, p. i. HARTLATB, 1903, Zool. Centralblatt, p. 27. 



The type species is Pelagohydra mirabilis, Dendy, from New Zealand. 



GENERIC CHARACTERS. 



Medusa similar to Margelopsis. Hydroid pelagic and closely resembles that of Marge- 

 lopsis, but tentacles arise irregularly from the sides ot the hydranth, and are not arranged in 



definite circlets as in Margelopsis, 



Pelagohydra mirabilis Dendy. 



Ptlagohyiira mirabilis, DENDY, 1903, Quart. 

 Journ. Microscop. Science, vol. 4(1, p. i. 

 plate 12. HARTLAIB, 1903, Zool. Cen- 

 tralbl., p. 27, fig. 3. 



Hydroid pelagic, with a trans- 

 lucent globular body 25 mm. wide, 

 constituting a float and a proboscis 

 at the end of which the mouth is 

 situated. The float bears many 

 long, irregularly arranged tenta- 

 cles. The proboscis is elongate, 

 pink in color, and of the shape of 

 a truncated cone. It has several 

 irregular whorls ot oral tentacles, 

 the shortest being nearest the 

 mouth. Medusae are borne upon 

 branching stolons which arise from 

 the sides of the float between the 

 tentacles. When about to be set 

 free the medusa is about i mm. 

 wide, with 4 radial groups of m.i i - 

 ginal tentacles, each group arising 

 from a large, pink, basal bulb, and consisting of 5 tentacles, 2 large, .2 small, and i smallest 

 median tentacle. 4 radial-canals. Manubrium pyriform and without oral tentacles. Nt\\ 

 Zealand. 



Family CLADONEMIDJE. 



CladonemiJt, GKI;I:NBAUR, 1856, Zeit. fur wissen. Zool., Bd. 8, p. 220. HM.CKI.I.. 1879, Sys,t. ilcr Medusen, p. 98. HART- 

 LAI-B, 1887, Zool. Anzcigcr, Bd. 10, p. 651; 1907, Nordisches Plankton, Nr. 12, pp. 5, no. GUNTHER, 1903, Mittheil 

 Zool. Sta. Ncapel, Bd. 16, pp. 56, 57. 



FIG. 40*3. Pelagoh\dra mirabilis, after Dcmiy, in Quarterly Journal Micr 

 scop. Science. 



a, entire li\ilr<>i,l, twice natural size. 



b, enlarged view, showing medusa-buds developing among tentacles. 



