CARYBDEID^E CARTBDEA. 509 



three-fifths as wide as long. Flexible lashes of tentacles 1.5 times as long as bell-height. 4 

 sense-clubs in niches 5 mm. above velarium. Each club with 2 large median and 4 small 

 lateral eyes, and an entodermal lithocyst. Velarium wide with 4 perradial, subumbrella 

 frenulae and 16 short, branched, non-anastomosing velar canals, 4 in each quadrant. Manu- 

 brium flat, wide, less than half as long as depth of bell-cavity. 4 simple lips. 4 very small, 

 interradial tufts of branched gastric cirri as in C. marsupialis. 



8 leaf-shaped gonads along entire sides of the 4 interradial septa. Each gonad is widest 

 near the stomach and tapers toward both ends. Flexible parts of tentacles and gastric cirri 

 dull pink. It swims toward a light at night. 



Gulf of St. Vincent, South Australia; Honolulu Harbor, Hawaiian Islands; Subig Bay 

 and Nasugbu, Luzon, and Mausalay, Mindoro, Philippine Islands, in January. Common 

 on surface. Probably widely distributed over the tropical Pacific. 



The medusa begins to develop its gonads when the bell is only 1 1 mm. high and they are 

 large in medusae 15 mm. high. 



The youngest medusae found by Haacke had a pyramidal bell and an axial-canal above 

 the stomach-cavity as if it might have been attached at one time to a scyphostoma nurse. 

 Each sense-club had but 2 eyes, the median ones; and the 1 6 velar canals were simple and 

 unbranched. C. arbortjera Maas, 1897, from Honolulu, is clearly the young of this species. 



This small medusa may be distinguished by its cubical bell and small pedalia. It is 

 closely related to the Mediterranean C. marsupialis. 



The following are the dimensions (in millimeters) of a specimen obtained by the U. S. 

 Bureau of Fisheries steamer Albatross in Subig Bay, Luzon, Philippine Islands, on the surface, 

 January 6, 1908. Height of bell, 34 ; width ofjbell, 20; length of pedalium, 11; width of 

 pedalium, 6.5; sense-clubs, 6 above the velar margin; flexible shafts of tentacles, contracted, 

 30 long. In this specimen the bell was unusually narrow. 



Carybdea xaymacana Conant. 

 Plate 56, figs. 5 to 7; plate 57, fig. I. 



Charybjea xaymacana, CONANT, 1897, Johns Hopkins Univ. Circl., No. 132, p. 8, fig. 8; 1898, Mem. Biol. Lab. Johns Hopkins 

 Univ., vol. 4, No. i, pp. 4, 7-57; figs. 1-16, 31-34, 36-43, 57-67, 69, 70, 72. BERGER, E. \V., 1898, Jour. Comp. Neurol- 

 ogy, Granville, vol. 8, p. 223, 5 figs, (structure of eyes); 1900, Mem. Biol. Lab. Johns Hopkins t'niv., vol. 4, No. 4, 

 p. 1-84, 3 plates. MAYER, A. G., 1904, Mem. Nat. Sci. Museum Brooklyn Inst. Arts and Sci., vol. i, plate 7, fig. 60. 



Tamoya ftunctata (young medusa), FEWKES, J. \V., 1 883, Bull. Mus. Comp.Zool.at Harvard College, vol. 1 1, p. 84, plate I, figs. 4-6. 



Bell 18 to 23 mm. high, 15 mm. broad. Sides vertical for two-thirds their height, above 

 which they slope slightly inward. A slight concavity at top of bell. Pedalia flat and scalpel- 

 shaped and between one-third and half as long as bell-height. The 4 tentacles are at least 8 

 times as long as the bell-height. The 4 sensory-clubs are situated each within a niche about 

 one-seventh or one-eighth the distance from bell-margin to apex. Each club contains an ento- 

 dermal, crystalline concretion and 6 ectodermal eyes; 2 of these eyes are large and median, 

 4 are small and lateral. These eyes are all on the centripetal side of the club, so as to look 

 inward into the bell-cavity. The median eyes are each provided with a prominent lens, 

 whereas the lateral eyes have no lenses. Velarium about one-seventh as broad as bell-diame- 

 ter. 16 velar canals, 4 in each quadrant; these canals are forked at their ends, at times with 

 more than 2 branches. Stomach flat and shallow. The throat-tube, which is well developed, 

 with 4 large oral lobes, hangs down into bell-cavity a distance between one-third and half 

 the bell-height; it is very sensitive and contractile and can be inverted into the stomach, 

 The 4 tufts of gastric cirri are epaulet-shaped and of small size. Each tuft arises from a 

 stalk-like base which projects from the subumbrella floor of the stomach. There are 8 leaf- 

 like gonads. 



Bell translucent, slightly pink or milky with bluish-purple nettling warts near the aboral 

 apex of the exumbrella and bluish-purple tentacles. 



This species was found by Conant in Kingston Harbor, Jamaica. I have obtained it in 

 Nassau Harbor, New Providence Island, Bahamas, in spring and summer. 



Good figures of the mature medusa are given by Conant, 1897-98. 



Berger, 1900, finds that strong light, or darkness, inhibits the pulsation of this medusa. 

 A sudden change in the intensity of the light acts as a stimulus. Removal of all 4 sense- 



