66 bulletin: museum of comparative zoology. 



CUNOCTANTHA, Haeckel, 1879. 

 Cunoctantha incisa, nov. sp. 



Figs. 145, 146, Plate 44. 



Specific Characters. — The bell is slightly flatter than a hemisphere and is 

 about 5 mm. in diameter. There is a slight apical projection, which is solid. 

 8 stiff tentacles arise from the sides of the bell, about halfway between the mar- 

 gin and the apex. These tentacles are provided with well-developed conical in- 

 sertions, and their entodermal cells are disk-shaped and highly vacuolated. 

 There is a well-developed peronium beneath each tentacle. The tentacles are 

 all of equal length, and are about three quarters as long as the bell diameter. 

 The ex-umbrella extends outwards in 8 lobes, which are held together in a web 

 formed of the ascending velum. These are 24 pear-shaped marginal sense-or- 

 gans, each containing a crystalline otolith and surrounded by a sensory pad 

 bearing delicate bristles. The lower velum is well developed. The proboscis 

 is fiat and the stomach cavity is small. The mouth is a simple opening without 

 prominent lips. The stomach gives rise to 8 pouches which extend outward in 

 the radii of the 8 tentacles. The incisions between these pouches are deeper 

 than iij Cunoctantha octonaria of Charleston Harbor. The entoderm of the 

 tentacles, and sometimes of the stomach, is green. Two specimens of this 

 medusa were found at the Tortugas, Florida, late in May, 1899. 



^GINELLA, Haeckel, 1879. 

 ^ginella dissonema, Haeckel. 



Figs. 30-33, Plate 14. 



^.ginella dissonema, Haeckel, E., 1879, Syst. der Medusen, p. 340, Taf. XX. Fig. 16 

 ^ginella dissonema, Agassiz, A., and Mayer, A. G., 1899, Bull. Mus. Comp. Zool. 

 at Harvard Coll., Vol. XXXIL p. 166. 



Specific Characters. — The bell is 3 mm. in diameter, and has the form of a 

 frustum of a cone with rounded apex. It is a little wider than it is high. 

 There are two long tentacles that arise from the sides of the bell at about | of 

 the distance from the margin to the apex. These tentacles are quite stiff and 

 incapable of contraction. They are carried trailing behind the medusa in two 

 straight parallel lines, and are about 3 times as long as the bell height. The 

 entodermal core of each tentacle consists in a row of disk-shaped, highly vac- 

 uolated cells. (See Figure 31.) In addition to the long tentacles there are 

 two very small protuberances (t. Figure 30) that arise from the bell margin, at 

 the foot of the pair of peronial tubes that are situated 90° from the large ten- 

 tacles. Haeckel, 1879, does not mention or figure these protuberances, and it 



