MEDTJS.E. 157 



Zonephyra corona, sp. nov. 

 Plate 4, figs. 19, 20. 



The bell is a little more than a hemisphere and is about 15 mm. in 

 diameter. The gelatinous substance is quite thick at the aboral pole, 

 but becomes thinner near the bell-margin. The surface of the ex- 

 umbrella is thickly sprinkled with nematocyst cells. There are eight 

 short hollow tentacles and eight marginal sense organs. Each sense 

 organ contains an entodermal mass of red-colored granules. There are 

 thirty-two broad lappets, two between each successive tentacle and sense 

 organ. The sub-umbrella is provided with a well developed set of circular 

 muscles. In addition to these there are sixteen spear-head-shaped radial 

 muscle strands in the sub-umbrella ; the broad ends of these muscle 

 strands are centripetal. These strands extend to the notches between 

 each successive tentacle and sense organ. Sixteen narrow radial muscle 

 strands are also found in the ex-umbrella, and they alternate in position 

 with the strands of the sub-umbrella. The proboscis is broad and flask- 

 shaped, and there are four recurved, crenulated lips. The four gonads 

 are interradial in position and are horseshoe shaped, the concavity being 

 directed outward. Each gonad is thrown into complex corrugations, and in 

 the female the eggs are easily seen on account of their deep purple color. 

 Each gonad is provided with from eight to ten gastric cirri. The gastro- 

 vascular cavity extends outwards in thirty-two pockets, one in each lappet. 

 The gelatinous substance of the bell is of a greenish-amber tinge. The 

 entoderm of the tentacles and the sensory entoderm of the marginal sense 

 organs is of a claret color, as are also the eggs. The entire entoderm of the 

 gastro-vascular cavity is of a delicate claret color, and the radial muscle 

 strands of the sub-umbrella are of a glistening white. A single specimen 

 of this medusa was found. It differs from the two species described by 

 Haeckel, 1880, in that there are thirty-two lappets instead of sixteen as in 

 Haeckel's forms. 



S d ; Station 14 ; September 7, 1899; N. Lat. 6° 41', W. Long. 137°. 



