[95J 



ALBATROSS EXPLORATIONS. 



597 



bers, with the Periphyllidae. Its coronal furrow and sculpturing of the 

 exumbrella recalls the former family, and the arrangement of the ten- 

 tacles in threes and other features, the latter. Haeckel rightly says of 

 N'auphanta that, like Atolla, ''it is a true deep-sea form of high phylo- 

 genetic antiquity." The allied Nauphantopsis supports Haeckel's inter- 

 pretation of the relationship of the Peroraedusse and the Collaspidse. 

 Ephyroides rotaformis Fewkes, gen. et sp. nov. 



A new genus, Ephyroides, has rounded elevations, from sixteen to thirty- 

 two in number, on the exumbral side of the corona of the bell. It is a 

 member of the Ephyridge of Haeckel, and occurs at the following stations : 



Periphylla hyacinthina St€enstrup. 



The Periphyllidie are represented by a fine suite of specimens of the 

 medusa, Periphylla hyacinthma Steenstrup, and another species which 

 may turn out to be a new genus closely allied to the latter. From these 

 medusae, of which there are fifteen specimens, I shall be able to study 

 at length the development of the genus Periphylla, of which at present 

 nothing is known. 

 Halicreas minimum Fewkes. 



In 1880-'81 the "Albatross " collected a strange medusa, to which was 

 given (Bull. Mus. Oomp. Zool., vol. ix, No. 8) the name Halicreas min- 

 imum Fewkes. In the present collection this genus is represented by 

 several specimens. The genus is a marked one, by the possession of 

 eight prominences on the margin of the umbrella, from which radial ribs 

 extend toward the center of the disk. These radial prominences bear 

 two or more rows of small rounded tubercles. The velum is similar to 

 that of Solmaris, Cunina and certain Narcomedusae. It has eight 

 rounded knobs on the subumbral surface of the disk, as in the young 

 Zygodactyla Orcenlandica. The specimens of this genus in the collection 

 will enable me to make out a good anatomy of this extraordinary medusa. 

 They come from the following stations : 



