202 PERCY SLADEN TRUST EXPEDITION 



specimens been in better condition I might have succeeded in determining the species. 

 In general appearance they resemble Gegenbaur's figure of Cunina lativentris (Gegenbaur, 

 1856, Taf. 10, fig. 2). The largest specimen measures 8 mm. in diameter, and its 

 umbrella is moderately thick. It has twelve tentacles, about 3 mm. long, tapering to 

 a fine point ; at their base is a semicircular band of nematocysts. The gastric pouches 

 are about as broad as long, vpith gonads in the course of development, and in shape 

 somewhat similar to Gegenbaur's figure. The otoporpse take the form of short narrow 

 lines, situated on ridges, four to five on each lappet. 



SCYPHOMEDUSiE. 



CHARYBD^ID^ 

 42. Charybdea sp. ? 



Locality. Farquhar Group, Surface. 2 Oct. 1905, x. 1 specimen. 



This single specimen is immature, and at a stage which makes identification so \erj 

 uncertain that it is perhaps best not to give it a specific name. 



The umbrella is 15 mm. wide and 23 mm. high, and tapers very slightly towards the 

 summit, which is slightly rounded. The ex-umbrella is free from warts and clusters of 

 nematocysts. The stomach is very short and rather flat ; the mouth has four lips. The 

 phacellge or gastric filaments are neither arranged in groups nor branched, but each 

 interradial set is composed of simple filaments. The velarium has six unbranched canals 

 in each quadrant. There are four tentacles, with pedalia about 7 mm. in length, and 

 having a flat spatula-like expansion on the inner side. The gonads are immature, about 

 11 mm. in length, and do not extend so far down as the plane of the sense organs. The 

 four perradial sense organs are situated about i mm. above the margin of the umbrella, 

 and the sensory clubs are suspended by a stalk in a deep pit, which projects out on the 

 wall of the sub-umbrella. The sensory clubs have two ocelli, one of which is very large 

 and nearly terminal, the other is above it, close to the stalk, and is very much smaller. 

 These are the median ocelli, but no lateral ocelli could be detected. 



CORONATE. 



43. Nausithoe punctata, KoUiker, 1853. 



Nausithoe punctata, Bigelow, 1909, p. 35, pi. 12, fig. .5. 

 Nausithoe punctata, Mayer, 1910, p. 554, pi. 60, figs. 4 — 5. 

 Nausithoe punctata, Bigelow, 1913, p. 85. 



Localities. North of Chagos. Chagos Archipelago. Amirante Isles. 



The collection contains 16 specimens taken at eight different stations. 



The specimens are rather small, not exceeding 5 mm. in diameter. Nearly all the 

 specimens have globular gonads, about equidistant apart. Two specimens, however, have 

 oval gonads, about twice as long as broad. 



This medusa inhabits the tropical and warm regions of all the oceans, and belongs to 

 the surface fauna. 



