MUSEUiVI OF COMPARATIVE ZOOLOGY, 153 



small triangular cavities. The stomach is capacious, and without peduncle. 

 It is very extensile, the lips normally falling outside the bell opening, but also 

 at times retracted into the cavity of the bell. The upper part of the bell cavity 

 is almost wholly taken up by large ovaries, which cover and conceal the whole 

 base of the proboscis. The ovarian glands are formed by four spherical lobes 

 of claret color, the surface of which resembles closely the convolutions of the 

 brain. The eggs are cast in abundance by the larger females, and were raised 

 into planiUae. They are white in color, and undergo a total, regular segmenta- 

 tion. I have not traced them into a hydroid, but have no doubt that they idti- 

 mately develop into that condition. 



The lower part of the proboscis is slender, and enlarges into a trumpet-shaped 

 mouth. The walls which separate the lobes of the ovaries are continued into 

 the lips as four elevated ridges, which give to the stomach, when seen from 

 below, a cruciform shape. The lips of the trumpet-shaped mouth are very 

 much folded, and are destitute of lasso-cells or knobs. The medial line of the 

 lower and slender portion of the proboscis is of a claret color, which fades 

 gi-adually in the raised ridges into brown and pale red. There are two tenta- 

 cles, both of which are very long and flexible, and of equal size. At rest they 

 are generally coiled up into a snarl about the tentacular knobs. Their color is 

 white. Between the long tentacles in either hemisphere of the bell margin 

 there are seven tentacula-like bodies, each one with a claret-colored pigment 

 spot, resembling in size and color an ocellus. McCrady speaks of three of these 

 pigment structures, or ocelli, but does not figure them in his plate. The ten- 

 tacula-like structures which arise from the margin of the bell near the radial 

 tube, intermediate between the longer tentacles, are larger than the others. 

 The size of all, as compared with the two long tentacles, is very small. 



S. apicata is common at Newport, and, like many other jelly-fishes, it seems 

 to prefer the bottom of the aquarium in which it is confined, and only rarely 

 comes to the surface of the water. 



Turritopsis nutricola, McCradt. 



Plate IV. Figs. 4, 7, 8, 9, 10. 



The genus Turritopsis, first suggested by McCrady, is well kno-wu on account 

 of the peculiar life of the young Cunina octonaria, McCr. in its beU cavity. 

 The only description which we have of the adult is by McCrady, but the dis- 

 tinguishing points in its structure were not sufficiently emphasized by him, and 

 especially in the account of the ba'je of the proboscis his description is quite 

 faulty. The commensalist in the bell cavity of the jelly-fish from Charleston 

 Harbor I have never seen. Cunina octonaria, its adult, is not found in Nar- 

 ragansett Bay. Cunina discoides, s. n. is, however, often taken, and its young 

 may be a commensalist in some other medusa, but finds no protection in the 

 bell of our Turritopsis. The bell of the adult T. nutricola has an almost spher- 

 ical shape, with thin walls and a slight apical projection. McCrady's figures 



