168 STOMOTOCA. 



tentacles, I am unable to determine whether it is a distinct species 

 from the Turritopsis of Charleston ; the color of the proboscis and of 

 the sensitive bulb is different in the two ; the ovaries are light brown, 

 with darker lines in the furrows between them ; the ocelli are dark- 

 red brown. The shape of the tentacles and of the bell, however, are 

 the same in both, as well as their habits, and the changes which this 

 Medusa goes through with advancing age. From each side of the 

 base of the four tentacles, at the junction of the circular and of the 

 chymiferous tubes, runs a thread of bunches of lasso-cells, which reach 

 nearly to the abactinal pole, as in the young Medusie of many of the 

 Tubularians. 



There is found at Nahant the young of a species of Turritopsis which 

 differs from the Turritopsis imfricida very essentially ; the bell, which 

 is remarkably thin, has a uniform thickness from the circular tube to 

 the abactinal pole ; the tentacles, even when there are only four, are 

 quite long, slender, and usually carried curled up along the sides of 

 the bell, giving these young Medusa a totally different aspect from the 

 young of the T. nutricula. I might mention here that the trace of its 

 connection with a Hydroid stock was very distinct in young Medusae ; 

 the adult Medusa was not observed. 



Charleston, S. C. (McCrady) ; Naushon, Buzzard's Bay (A. Agassiz). 



Cat. No. 273, Naushon, September, 1861, A. Agassiz. Medusa. 



Cat. No. 440, Naushon, July, 1864, A. Agassiz. Medusa. 



STOMOTOCA Agass. 



Stomotoca Agass. Cont. Nat. Hist. U. S., IV. p. 347. 1862. 



Saphenia Forbes (non Esch.). British JJaked-eyed Medusae, p. 25. 1848. 



Stomotoca apicata AcxAss. 



Stomotoca apicata Agass. Cont. Nat. Hist. U. S., IV. p. 347. 1862. 

 Saphenia apicata McCr. Gymn. Charleston Harbor, p. 27, PI. 8, Figs. 2, 3. 



Charleston, S. C. (McCrady) ; Newport (A. Agassiz). 

 Cat. No. 454, Newport, A. Agassiz. Medusa. 



Stomotoca atra Agass. 



Stomotoca atra A. Agass.; in Agassiz's Cont. Nat. Hist. U. S., IV. p. 347. 1862. 



This Medusa (Fig. 271) is much larger than the one Forbes has de- 

 scribed as S. dlnema (Naked-eyed Medusa?, PI. 11. Fig. 4), which meas- 

 ures only a quarter of an inch, while this species is from three quarters 

 to an inch in size ; it is much less elongated, the vertical and horizontal 

 diameters being the same ; it swells out to its greatest horizontal diam- 



