26 THE MEDUSAE. 



entire endodermal system is described as densely pigmented. The fact that 

 the two forms, P. dodecabostrycha and P. hyacinthina, have both often been taken 

 not only at the same locality, but even in the same haul, is a further, even 

 if indirect, argument in favor of the view that they represent nothing more 

 than different stages in the growth of but one species. If this be the case, 

 the older name, P. hyacinthina Steenstrup, '37, must be retained. 



As to the validity of P. reyina Haeckel, which both Maas ('97, : 04°) and 

 Vanhoffen (:02 a ) retain as a good species, I am not able to form any final 

 opinion, since I have at hand only a single rather fragmentary alcoholic 

 specimen from the Gulf Stream, which can be referred to this species. The 

 fact, however, that in this form the gonads do not appear until a size of 

 some 70 mm. in diameter is attained (Vanhoffen, : 02 a ) argues strongly for 

 the view that it is a distinct species. There appears, also, to be a definite 

 difference in its color from that of the other species, although this difference 

 is not shown in Van hiiff en's figure. 



Periphylla hyacinthina Steenstrup. 



Periphylla hyacinthina Steenstrup, '37; Haeckel, '80, p. 419; Vanhoffen, : 02 a , p. 23, 



tat. 2, fig. 9; Maas, : 04 c , p. 47, pi. 5, fig. 35, pi. G, figs. 45,46. 

 ? Charybdea bicolor Quoy et Gaimard, '33, p. '293, pi. 25, figs. 1-3. 

 Quoyia bicolor L. Agassiz, '62, p. 173. 

 Charybdea periphylla Peron et Lesueur, : 09, p. 332 ; Blainville, '34, p. 275, pi. 31, fig. 1; 



L. Agassiz, '62, p. 173. 

 Periphylla peronii Haeckel, '80, p. 420. 



If we accept the view that P. hyacinthina and P. dodecabostrycha are in 

 reality but one species, the following synonyms must also be included : — 



? Chrysaora (dodecabostrycha ?) dubia Brandt, '38, p. 3S7, taf. 29, 30. 

 Dodecabostrycha dubia L. Agassiz, '02, p. 17.'!. 

 Cassiopia dubia Lesson. '4o, p. 108. 



Periphylla dodecabostrycha Haeckel, '80, p. 421 ; Vanhoffen, '92, p. 10, taf. 2, fig. 1; : 02 a , 

 p. 23; .Maas, '97, p. G3, taf. 9; : Ot, p. 47, pi. 5, figs. 86, 37. 



Plate 1, Fig. 3; Plate 9, Fig. g. 

 Station Ki-VJ; 200 fathoms to surface; one specimen, very fragmentary, 

 15-20 mm. in diameter. 



Station 4669; 300 fathoms to surface ; two specimens ; diameter about 

 L0 min. ; fair condition. 



Station I7H7 ; .'i00 fathoms to surface ; one specimen, 80 mm. in diameter 



i nun. high. 

 A l so twenty-three other specimens ranging from 20 mm. to 40 mm. in 



