Plate 7. 



Mnemiopsis leidyi. Agassiz Laboratory, Newport, Rhode Island^ 



summer of 1892. 



Fig. 40. Young M. leidyi, 10 mm. long with developing oral lobes. 



and auricles. The embryo is now in the Bolinopsis- 



stage. 

 Fig. 41. Sense-organ of the ctenophore shown in figure 40. 

 Fig. 42. View of broad side of a mature M. leidyi. Natural size. 

 Fig. 43. View of auricular side of a mattu^e M. leidyi. Natural size.. 



Lobes not expanded. 

 Fig. 44. Half-grown M. leidyi; side view, natural size. 

 Fig. 45. View looking down upon mouth of M. leidyi. Natural size. 



Showing expanded lobes and auricles. 



Drawn from life, by the author. 



