[15] 



MEDUSA FROM THE GULF STREAM. 



527 



Family HALICREASID./E, Fewkes. 



Halicreas minimum, Fewkes. 

 Specimens of Halicreas were taken from the following: locality: 



This genus is recognized by the eight tubercnlated projections on the 

 exumbral margin of the bell. From these projections there extend to 

 the vicinity of the center of the bell eight ribs or radial depressions, 

 which appear on the subumbral surface as radial depressions between 

 which the octants of the subumbrella are some wb at swollen. Near 

 the center of the subumbrella is a ring of eight knobs which lie one 

 in each octant between the above-mentioned depressions. 



There is a well marked vellum below the marginal projections. The 

 radial projections appear as elevations on the exumbral side of the bell 

 in alcoholic specimens. 



In my former paper * I referred this genus to the Narcoinedusse of 

 Hseckel. There is no reason from a study of new material to change 

 that opinion of the affinities of the family of Halicreasidne. 



Family PEGANTHID^, Haeckel. 



Among the families of JSTarcomedusa3 described by Haeckel is the 

 Peganthidse, a family without radial canals and gastric pouches in the 

 subumbrella but with a festoon canal. The sexual bodies are either 

 lobed or form a non-continuous baud on the .under floor of the stomach. 



Among the medusas collected by the Albatross is one which has a 

 close likeness to the genus Pegantha of the Peganthidae but which 

 differs from the known species of this genus so widely tbat it may be 

 necessary later to call it a new species. 



This Pegantha somewhat resembles P. quadriloba, although the genital 

 sacs are not as markedly four-lobed as Hseckel's description of this 

 species would seem to indicate. It has marked lobes in the sexual 

 glands, but the poor condition of preservation and the rupture in one 

 or two instances of the gland from its attachment rendered it impos- 

 sible for me to tell to what species this Pegantha, belongs. 



* Bull. Mus. Comp. Zool., ix, 8, p. 306. Iii oue of the two specimens of Halicreas 

 there described, sausage-shaped sexual bodies were observed hanging from the under- 

 side of the bell. In one of the above specimens (15750) glandular bodies were ob- 

 served in the subumbral radial furrows. 



