BAHAMA MEDUSiE. 33 



PLATE VI. 



Fig. 53. Olindias tenuis. Mature medusa. 



" 54. " " Side view of bell-margiB, showing that the 



short tentacles arise from the sides of the 

 bell above the margin, while the long flex- 

 ible tentacles arise from the bell-margin. 

 The short tentacles have each a sucker-like, 

 nematocyst-pad upon the aboral side of 

 their distal ends; while the long flexible 

 tentacles have numerous half-rings on 

 their inner, and a well developed strand 

 of longitudinal muscle fibres upon their 

 outer sides. 



" 55-57. " " Successive stages in the development of the 



sucker-like nematocyst-pad upon the 

 aboral side of the short tentacles in 

 medusa9 the diameter of whose bells are 

 respectively 2 mm., 8 mm. and 16 mm. 



" 58. " " Side view of a portion of one of the long 



tentacles showing the half-rings of nema- 

 tocysts on the inner and the strand of 

 longitudinal muscle fibres on the outer 

 side. 



" 58a. " " Extremity of one of the long flexible ten- 



tacles showing the terminal knob of 

 neniatocysts, and the pad-like thickening 

 upon the outer side of the tentacle, com- 

 posed of closely crowded elongate nema- 

 tocyst cells. 



" 59. '■ " View of one of the gonads. 



PLATE VII. 



Pig. 60. "Tamoya punctata," Fewkes. 

 " 61. Tamoya haplonema, F. Miiller. Side view, natural size. Specimen from 



Great Peconic Bay, Long Island, New 



York. 

 " 63. " " View of canals in the velarium. 



" 63. " " The sensory club seen from the centripetal 



side. 

 " 64. " " The sensory club seen from the side, showing 



ectodermal eyes, and entodermal otolith. 

 " 65. Section through, the gonad of Showing that the entoderm and ectoderm 

 Eucheilota paradoxica. of the bud are derived directly from the 



same layers of the gonad. ect, ectoderm ; 



ent, entoderm, b, gonad of the budding 



medusa. 



