MUSEUM OF COMPARATIVE ZOOLOGY. 85 



directly from the inner wall of the bell cavity, as the larva grows older a rounded 

 protuberance forms in the upper walls of the bell cavity from which the pro- 

 boscis hangs. This protuberance, when seen from the side, is hemisiiherical in 

 shape. It forms, however, by means of mesenteries which join the inner wall 

 of the bell in the four meridians passing through the sense-bodies, four pockets, 

 or blind cavities, enclosed by it and the inner bell walls. These pockets are 

 extensions of the bell cavity into the apical walls of the bell, and are separated 

 from each other on the sides by the mesenteries which join the sides of the 

 proboscis and the inner bell walls. In these recesses transparent globules were 

 observed in several specimens. Two of these are represented in Fig. 5. 



Figs. 2, 3. 



Two small jelly-fishes which are closely related to the above, or are the larvre 

 of a Medusa like Tamoya, were found on several excursions in Castle Harbor. 

 They are slightly smaller than the youngest larva3 of the aljove-mentioned 

 Acaleph, and for lack of l)etter knowledge have been provisionally referred to 

 S. lyunctata. 



The bell walls are thin, rigid, and without chymiferous radial tubes, while 

 the outer surface is destitute of the characteristic cells whicli have suggesteil 

 the name 2^unctata. The proboscis is very slightly developod, resembling a 

 simple muscular layer split off from the inner walls of the bell l)elo\v the 

 a^^ex. 



The bell margin bears four tentacles alternating with as many sense-bodies, 

 all of which are situated in one and the same plane. The four tentacles are 

 rigid, and crossed by annulations of cells arranged in bands, as in T. punctata. 

 Each otocyst is a simple spherical sac, in which is found an otolith. The 

 style which bears the otolith has well-defined pigment spots in its walls ; 

 these are probably ocelli. No well-marked " hood," such as exists in Tamoya, 

 is yet developed. Near the point of attachment of the otocyst, which has no 

 peduncle, to the bell margin, there is a thickening of the bell margin, fonning a 

 protuberance on either side of which are small clusters of nematocysts. 



Ectopleura sp. 



Fig. 11. 



A small Medusa, evidently larval, is referred to the genus Ecfoplnira. Un- 

 like the young* of E. ochracea A. Ag., it has only two well-developed tentacles, 



* P.ull. Mus. Comp. Zool., IX. 8. An unknown Tubularian (Fig. 14), probably 

 larval, whicli was unlike any of tlie species of American genera, was taken at New- 

 port during my work there last sunnner. Description of a single specimen : — 



Bell colorless, high, with thin walls and wellmarked apex, crossed by four l)roa(l 

 radial tubes; outer surface irregularly covered with lasso-cells. The tentacles are 

 two in number, and are placed opposite each other on the bell marg:n. Proboscis 

 mounted on a hemispherical projection of the apex of the bell into the bell cavity. 

 Stomach diminutive, lips small, smooth, slightly colored. 



