MAYER : MEDUSA FROM THE TORTUGAS, FLORIDA. 



77 



Ersaea hispaniana, nov. sp. 



Fig. 100, Plate 29. 



Specific Characters. — Erstea hispaniana. The mature animal is 7 mm. in 

 length. The covering scale is hood-shaped without a sharp apex. Its lower 

 portion is sharp-edged, and overlaps the large swimming-bell. The phyllocyst 

 is short and blunt, and contains a highly refractive "oil" globule. The large 

 swimming-bell is provided with 4 longitudinal, serrated ridges that give it a 

 rectangular appearance in cross-section. There are 4 radial tubes, a circular 

 vessel, and a well-developed velum. Two or more gonophores are seen bud- 

 ding out from the side of the feeding-polypite near its base. These gonophores 

 ((/, Figure 100) are medusiform and are provided with 4 radial tubes, a circular 

 vessel, and a velum. The genital products are found within the manubrium. 

 In Figure 100 a single large, oval egg is seen occupying this position. 



Both Diphyopsis hispaniana and Ersaea hispaniana were conmion at the 

 Tortugas, Florida, in July, 1898, but were not seen during the summer of 

 1899. 



5 ABYLA, QnoT and Gaimard, 1827. 

 <-AGLAISMA, EscnscHOLTZ, 1829. 



Abyla pentagona, Eschscholtz. 



Figs. 101, lOla-103, Plate 30. 



Abyla pentagona, Eschscholtz, F., 1829, Syst. der Acalephen, p. 

 132. 



Calpe pentagona, Quoy, J. R. C, and Gaimard, P., 1827, Ann. der 

 Sci. Nat., Tom. X. p. 11, PI. 2 A. Figs. 1-7. 

 Polygastric , Abyla trigona, Vogt, C, 1854, Mem. de ITnstitut Nat. Gencvois, 

 Generation ( Tom. I. p. 121, PI. XX. Figs. 4-7 ; PI. XXI. Figs. 3-6, 10-13. 



Calpe Gegenbauri, Haeckel, E., 1888, Siphonophorae, Challenger 

 Report, Zo(iI., Vol. XXVIII. p. 164, PI. XXXIX. Figs. 1-12. 



Abylopsis pentagona, Chun, C, 1897, Siphonophoren der Plank- 

 ton Expedition, Bd. II. K. b. p. 30. 



Free Sexual 

 Generation 



Aglaisma cuboides, Chun. 



Fig. 104, Plate 30. 



Eudoxia cuboides, Leuckart, R., 1853, Siphonophoren, p. 59, Taf. 

 III. Figs. 7, 8, 10. 



Einzolthiere der Abyla pentagona, Gegenbaur, C, 1854, Zeit. fur 

 Wissen. Zool., Bd. V. p. 295, Taf. XVI. Figs. 1, 2. 



Aglaisma Gegenbauri, Haeckel, E., 1888, Sipbonophora}, Chal- 

 lenger Report, ZoGl., Vol. XXVIII. p. 119, Plate XL. Figs. 

 13-20. 



Aglaisma cuboides, Chun, C, 1897, Siphonophoren der Plankton 

 Expedition, p. 30. 



