BIGELOW: MEDUSAE AND SIPHONOPHORAE. 415 



of the two " Ceratocymbas " are even more diagnostic (Moser, 1913a), 

 that of the eudoxid of Ahyla leuckartii (C. asymetrica) having the two 

 basoventral teeth short, and roughly equal in length (Plate 6, fig. 4, 

 Lens and Van Riemsdijk, 1908), whereas in Ceraiocymha sagittata one 

 of these teeth is very long, the other very short (^Plate 7, fig. 2, 3) as 

 observed by Chun (1888) and Bedot (1904). One of the most in- 

 teresting features of Ceralocyviha asymetrica, is that the 9 and d^ 

 gonophores are not alike (Moser, 1912a) the right basoventral tooth 

 being prolonged in the male, the left hand one in the female (Plate 7, 

 fig. 2-5) ; and the asymmetry of the hydroecial walls being similarly 

 reversed, the left-hand one largest in the cf, the right hand in the 

 female. Furthermore, the as} mmetry of these ridges is much more 

 pronounced in the male than in the female. 



So far as its bract is concerned the eudoxid here described might 

 equally well develop into either " Ceratocymba." But its gonophore 

 (Plate 6, fig. 2) unmistakably connects it wath C. sagittata, thus 

 corroborating Moser; for even at this early stage the right baso- 

 ventral tooth is longest, the left hydroecial wall broadest (in the d^ ) : 

 while the basodorsal tooth is of the spur-like outhne characteristic 

 of C. sagittata. And the characteristic asymmetry, with prominent 

 wing-hke left-lateral ridge, smaller right-lateral ridge, and suppressed 

 dorsal ridge, is already well developed. 



In slightly older gonophores, from the free eudoxid, the disparity 

 in length between the two basoventral teeth is greater. And with 

 further growth the difference increases, until it is very marked (Plate 

 7, figs. 2, 3; Moser, 1912b, fig. 23), while an equally striking change 

 takes place, with growth, in the hydroeciurn, its broad enclosing flaps 

 dwindling, until in examples upwards of 30 mm. long, the hydroeciurn 

 is wide open (Plate 7, fig. 4, 5). 



Moser (1912a) has already noted the similarity between the in- 

 ferior nectophore, and the cf gonophore of the free eudoxid, in Cerato- 

 cyviha sagittata. This I need merely corroborate, pointing out that 

 in both it is the right hand basoventral tooth which is prolonged, and 

 that in both the left-lateral ridge is far more prominent than the right 

 hand one, with the dorsal ridge practically suppressed. 



Galeolaria Blainville, 1834. 



Diphyidae, with rounded nectophores, of about the same size; the 

 groups of appendages are permanently attached to the stem. 



This definition excludes the D. truncata Sars, referred to Galeolaria 

 by Moser (1913b, 1915a, 1915b). Recent researches have shown that 



