PURENA BROWNEI. 183 



characters are constant in the present large series, it seems to me that they 

 are worthy of recognition, at least until the hydroid stage is known. 



Purena brownei, nom. nov. 



Dipurena sp. ? Browne, : 05 b , p. 133, pi. 2, figs. 1, 2. 



Plate 7, Fig. 7 ; Plate 44, Figs. 8-10. 



Mangareva Harbor ; surface ; many specimens. Type. 



Acapulco Harbor ; surface ; 37 specimens. 



The largest specimens measure 5 mm. in diameter. 



The bell is moderately high and rounded ; there is no apical projec- 

 tion ; the gelatinous substance is rather thick (PI. 7, fig. 7) ; the bell cavity 

 deep. 



Tentacles. — The four tentacles when extended are much longer than the 

 height of the bell. Near their bases they are smooth (PI. 44, figs. 8-10) ; 

 but throughout the rest of their length they are thickly set with oval, trans- 

 versely placed nematocyst clusters, which are irregularly arranged and 

 none of which form rings. The basal bulbs have been well described by 

 Browne (: 05 b ). They are globular, imbedded in the jelly (PI. 44, fig. 10), 

 and surrounded basally by a circular swelling or band which is crowded 

 with nematocysts and bears a prominent ocellus on its outer face (PI. 44, 

 fig. 10, o). 



The manubrium is moderately long, hanging a short distance below the 

 bell-opening. In the Ceylon specimens Browne has described it as rather 

 longer, " two to three times the length of the cavity of the umbrella " 

 ( : 05 b , p. 134) ; but in none of our specimens is it so long. At its proximal 

 end it bears a triangular projection into the gelatinous substance of the bell 

 (PI. 7, fig. 7). The stomach proper is terminal, and barrel-shaped (PL 7, 

 fig. 7). The mouth is circular, with simple lip. 



Gonads. — The gonads form rings, which are entirely separate from one 

 another and surround the manubrium ; 1 have not found them occurring on 

 the stomach proper. The number of rings is variable, the greatest number 

 counted being five, the least, one ; and this variation is independent of dif- 

 ferences in the sizes of the medusae. The collection contains both males 

 and females. 



Color. — The ocelli are yellowish, the gonads opaque white; otherwise 

 the species is colorless. 



