PROBOSCIDACTYLA. 



173 



both sides of the cross-shaped edges of the digestive cavity, giving it a 

 quadrangular appearance, when seen from above. (Fig. 279.) Found 

 at Naushon the last part of September, one tenth to one eighth of an 

 inch in diameter. 



Charleston Harbor (McCrady) ; Buzzard's Bay, Naushon (A. Agassiz). 



PROBOSCIDACTYLA Brandt. 



Proboscidactyla Brandt ; in Mem. Acad. St. Petersburg, II. p. 228. 1835. 

 Proboscidactyla Agass. Cont. Nat. Hist. U. S., IV. p. 346. 1862. 



Proboscidactyla differs from WiUia in the mode of branching of the 

 chymiferous tubes ; in the former genus each main chymiferous tube 

 divides into two halves, branching symmetrically on both sides from 

 the i two main branches, which is not the case in WUlia. 



Proboscidactyla flavicirrata Br. 



Proboscidactyla favicirrata Br.; in Mem. Acad. St. Petersb., p. 390, PI. 19. 1838. 

 Proboscidactyla favicirrata Agass. Cont. Nat. Hist. U. S., IV. p. 346. 1864. 



This small Medusa seems quite uncommon in the Gulf of Georgia. 

 I only found a couple of specimens, in the lal> 

 ter part of June, near Galiano Island. They 

 are so small and so transparent that it requires 

 the utmost attention to discover them. It seems 

 to be the species found by Brandt on the coast 

 of Kamtschatka ; he was unable to find any 

 actinostome in the trunk-like prolongation (Fig. 

 280), which he represents as surrounded by a 

 large number of small tentacles ; the digestive 

 cavity opens by an actinostome, surrounded 

 by four large lobes, and these subdivide into a 

 number of smaller lobes, subordinate to the larger ones. (Fig. 281.) 

 The ovaries are attached to the abactinal extremity of the chymiferous 

 tubes, and extend but a short distance towards ng. 28i. 



the periphery along the four radiating tubes 

 (Fig. 281) ; the chymiferous tube runs sin- 

 gle for a short distance, before the principal 

 division into two branches takes place (&, Fig. 

 282) ; at the point of meeting of each of the 

 smaller branches with the circular branch, 

 there is a very marked eye-speck ; the tentacles are numerous, each 



Fig. 280. Proboscidactyla flavicirrata ; magnified. 

 Fig. 281. Actinostome and digestive cavity. 



