306 BULLETIN OF THE 



are somewhat difficult to make out, and it is provisionally named G. rubrv.ru 

 until future observations can complete this imperfect sketch. 



Halicreas minimum, gen. et sp. nov. 



Two specimens * of a new and highly interesting jelly-fish closely related to 

 the Narcornedusae were found by the members of the Commission. 



Halicreas, gen. nov. 



The genus Halicreas differs from other medusae in possessing eight promi- 

 nent rounded projections covered with tubercles on the bell margin at the 

 extremity of eight radially arranged ribs passing from centre to circumference 

 of the bell. No proboscis. No tentacles. It has eight sausage-shaped ovaries 

 hanging into the bell cavity from its upper surface. 



H. minimum, sp. nov. 



The bell of the alcoholic specimen is flat, disk-shaped, translucent, white. 

 In its walls are eight radial stripes, which were at first mistaken for radial 

 tubes. They are, however, simple thickenings of the bell walls, and in general 

 character are not unlike the radial stripes of Cassiopea. No opening was traced 

 from them into the stomach, and they seemed to be solid throughout. Each of 

 these radial stripes terminates on the bell margin near a prominence which is 

 very marked in both specimens. This protuberance bears many small rounded 

 papillae. No remnant of tentacles was observed hanging from these tubercles 

 or from the papillae. Tentacles are also absent on the bell margin between 

 the prominences. The margin of the bell between two marginal prominences 

 is smooth and destitute of otocysts. A narrow " velum " (?), which probably 

 forms the sides and lower floor of a stomach, hangs down in both specimens 

 from the bell rini.f In the specimen preserved in chromic acid this structure 

 is very much convoluted on account of the contracted condition of the bell 

 walls. No otocysts were observed on its lower rim. Chymiferous tubes are 

 wanting in the bell walls of both specimens. No circumferential vessel. 

 There is no proboscis, and the stomach seems to resemble that of Gumma dis- 

 coides. Its upper wall is the wall of the bell, and its floor the surface of the 

 " velum." 



Eight ovaries hang into this gastral cavity. They arc sausage-shaped, and 

 arise near the centre of the disk in the intervals between the radial Btripes 



* One of these had the disk expanded, and was preserved in spirit. Tim other 

 was contracted, globular, and less translucent It resembles a jelly-fish preserved in 

 chromic acid. The second specimen had eight ovaries hanging down in the Ml 

 cavity. These organs were wanting in the former specimens, but the scan where 

 they formerly were attached still existed 



t Circumference of the disk connecting the prominences. 



