i(i i;it\VAi;i) T. iiitowNi;. 



tcntuclcs on the oue lialtOt' the uinhrcllar margin, and on the other hall" only twelve 

 small bulks. Another specimen has one short tentncle and five bulbs close together 

 in one quadrant, and the other three quadrants are without tentacles, bulbs, or a 

 circular canal. These specimens arc either congenitally abnormal, or else in the process 

 of rejMiiring .serious injuries. The latter specimen has every appearance of having lost 

 the greater portion of its original umbrcllar margin, and the wound scorns to have 

 healed up. The former probably lost one half of its tentacles and has begun to 

 develop a fresh set. 



There is an interesting abnormality in one sperimen. From one of the radial 

 canals, not far from the top of the nmbrellar cavity, hangs down an extra stomach with 

 a mouth. The stomach has the shape of a slender tube, and bears a few genital folds. 

 The mouth is fairly large for the size of the stomach, and its margin is folded. 



A large Amphii)od belonging to the genus Ilyperin was fouml inside the nmbrellar 

 cavity of two specimens. 



Perigonimus. sp. ? 



In the ' Discovery ' collection there are four specimens of a little Medusfi wliirh 

 looks like a very early stage of a Perhjon'iinus. They are all about the same age and 

 have U(jt been long liberated from their hydroid. The .shape and structure of the 

 tentacles are not in favour of this Medusa being a very early stage of Cdtahlemn. 



Description. — The umbrella is about 1 mm. or less in length and width, with a 

 small conical process on the summit. The stomach is short, and the mouth has four 

 little lips. Four ra<lial canals. The "gonads have not begun to develop. There are 

 two long, oppo.site perradial tentacles, with huge tapering basal bulUs. Two very 

 small, opposite perradial ami four very small interradial tentacles. 



Family BYTIIOTIARID.K (Maas, 11)05), Bigelow, I'JOU. 



Genus SlBOGiTA,*Maas, 1905. 

 sens. em. 



Generic character. — Bythotiaridto with fouj- perradial canals ; with four (jr more 

 centripetal canals, whi(;h may either remain blind canals, or join the radial c^inals (when 

 the latter have the appearance of being branched), or join the l»ase of the stomach. 



Mr. Bigelow (1909) has recently emended Maas' original detiniticm of the genus, 

 so as to be able to include within the genus a new species called Sibngita simulans, 

 found in the Tropical Pacific between Panama and Chatham Island, and also in the 

 Behring Sea ; and another new species called S. nauarclms, found in the Gulf Stream 

 oH" the North American coast. I now find it nc(es.sary to slightly alter Bigclow's 

 definition of the genus for the admittance of a new Antarctic species, named Sibogita 

 horc/u/reiujiki, in honour of the leader of the ' Southern C'ro.ss ' Expedition to the South 

 Pole. I think it is advi.sable to leave the structure of the gonads out of the yeueric 



