142 THE MEDUSAE. 



tentacles per octant ; but this has been counted on so few specimens of 

 H. glabrum, H. rotundaium, and H. conica that we cannot yet lay much stress 

 on it. Form of the bell is not of much value, because in the present series of 

 Haliscera papillosum and of Homoeonema it varies greatly. In short, I am 

 led to ao-ree with Maas (: 06 b ) that we may as well unite H. glabrum and H. 

 rotundatum. But whether or not H. conica is also a synonym of H. glabrum is 

 doubtful. It appears to be separated from H. racovitzae by the position of the 

 gonads. The specimens in the present collection, which appear, on account 

 of size at maturity and number of tentacles, to belong to two species, all 

 have proximal gonads, as have H. platygonon, H. alba, and H. racovitzae, — all 

 of which Maas, from recent studies, believes to be distinct. H. -platygonon is 

 easily recognized by its very small size at maturity (4 mm. in diameter); 

 H. racovitzae, so far as we can judge from Maas's single specimen, by a char- 

 acteristic intense purple pigmentation of the entodermic system. H. cdba 

 is larger (30 mm. in diameter) and colorless. Structurally all three are 

 extremely close together. 



The majority of the present specimens seem best referred to H. alba, 

 because of the position of the gonads, number of tentacles per octant, 

 general form, and lack of pigmentation. The second species is probably 

 identical with H. racovitzae, but since the specimens differ from this species 

 in pigmentation the identification can be no more than provisional. 



Homoeonema alba Vanhoffen. 



Haliscera alba Vanhoffen, : 02 b , p. 71, taf. 9, fig. 5. 



Plate 3, Figs. 1, 2; Plate 33, Figs. 6, 11 ; Plate 34, Fig. 9. 



Station 46G3 ; 300 fathoms to surface; 1 specimen, 20 mm. in diameter. 



Station 4668; 300 fathoms to surface; 1 specimen, 13mm. in diameter. 



Station 4071 ; 300 fathoms to surface; 1 specimen, 5.5mm. in diameter. 



Station 4076 ; 300 fathoms to surface ; the specimen photographed, 

 ] 7 nun. in diameter. 



Station 1077 ; 300 fathoms to surface; 1 specimen, 23 mm. in diameter; 

 fragmentary. 



Station 1079; 300 fathoms to surface; 1 fair specimen, 22 mm. in 

 diameter. 



Station 469] ; 300 fathoms to surface; 2 fragments. 



Station 1717; 300 fathoms to surface; 1 specimen, 10.5 mm. in 

 diameter; gonads already developed. 



