BIGELOW: MEDUSAE AND SIPHONOPHORAE. 397 



their identity must remain in doubt. But Haeckel's Polycolpa forskalii 

 is generlcally distinct from Pegantha, as here defined, for in Uving 

 specimens of that species (Haeckel, 1881, p. 31, pi. 10, fig. 1-8), the 

 gonad forms a ring around the stomach, and does not "send out 

 caecal or pouch-like processes into the separate lobe cavities." Only 

 on the assumption that Haeckel's entire account was an error, which 

 the excellent condition of his material forbids, could it be associated 

 with any Pegantha. 



P. viagnifica Haeckel resembles the P. clara-P. smaragdina group 

 in its numerous tentacles (30) ; but is separated from all other Pegan- 

 thas by the presence of conical nematocyst knobs on the exumbrella, 

 and by the large number (30-35) of otocysts per marginal lappet. 



The following species also apparently belong to Pegantha, as here 

 limited: — FoveoUa diadema Lesueur, Acquorea cyanogramma Quoy & 

 Gaimard, (both redescribed by Haeckel, 1879), Polyxenia cyanolina 

 Haeckel. But the accounts of all three are so unsatisfactory that 

 their tentacle-number alone, 16-20 for all, is established. The gonads 

 are described by Haeckel as simple in P. diadema, trifid in P. cyano- 

 gramma, four parted in P. cyanolina; but as he saw alcoholic material 

 only, little weight can be laid on them. 



Pegantha clara R. P. Bigelow? 



Pegantha clara R. P. Bigelow, 1909, p. 80. 



Pegantha smaragdina H. B. Bigelow, 1909a, p. 90, pi. 14, fig. 1, 2, pi. 19, 



fig. 1-9, pi. 22-26. 

 Polycolpa forskalii Vanhoffen, 1908a, p. .56; 1912, p. 32; 1912a, p. 391 (non 



Haeckel, 1879, 1881). 



Station 



10,176 50-0 meters 1 spec. 18 mm. in diam. 21 tent. 



10,176 " " 1 " 16 " " " 20 " ■ 



10,211 " " 1 " 12 " " " 19 " 



10,196 surface 1 " 14 " " " 23 " 



These small specimens are referred to P. clara, as the young of that 

 species, on the strength of their numerous tentacles, and the limitation 

 of exumbrella sculpture to the lappets, P. clara (incl. P. smaragdina, 

 and P. forskalii Vanhoffen) being the only Pegantha with upwards 

 of eighteen tentacles before the gonads appear, except, perhaps P. 

 magnifica, which, however, has exumbral nettle-warts, and a very large 



