STAUROMEDUSyE — KISHINOUYEA, IIALICLYSTUS. 



531 



Wide ring muscle at margin of sulnimbrella and 8 strands of radial-muscles extending 

 outward to the tentacles. These radial strands are one-third wider than the rinsr muscle. 



o 



They inclose 4 narrow, triangular areas in the interradii and 4 wider, rectangular spaces in 

 the perradii. These subumbrella areas between the muscle strands exhibit many large nettle- 

 cells. There are about 12 simple, unbranched, gastric filaments in each of the 8 rows. Found 

 at Gauss Station, Kaiser Wilhelm II Land, Antarctic Continent, at a depth of 192 fathoms, 

 in November, 1902. 



Genus KISHINOUYEA, nom. nov. 



Schizodiscus, preoccupied by Kittl, 1S91. 



SchizodiscuSj Kishinouye, 1902, Jour. College Sci., Tokyo, vol. 17, art. 7, p. 5. 



The type species is K. nagatcnsis of Japan, first described by Oka under the name Lticer- 

 naria nagatcnsis. 



GENERIC CHARACTERS. 



Stauromedusse with 4-chambered stomach as in the Eleutherocarpidx, and without adhe- 

 sive anchors. Umbrella deeply notched, with 8 adradial lobes. 8 adradial clusters of 

 knobbed tentacles. Peduncle 4-chambered without muscle-fibers in the taeniola. Gonads 

 8 adradial bands of laterally oblong sacs. 



This genus is very closely allied to Lucernaria and is distinguished only by its 4-chambered 

 aboral stalk. In young medusae, however, it is single-chambered, as in Lucernaria, but the 

 4 interradial septa, or taeniola, unite near the pyloric region as growth proceeds, and thus the 

 peduncle comes to have 4 perradial, separate chambers. 



Kishinouyea nagatensis. 



Lucernaria nagatensis. Oka, 1897, Zool. Mag. Tokyo, vol. 9, p. 67, plate i. Also; Annot. Zool. Jappon. Tokyo, vol. i, p. 141, 



4 figs- 

 Schizodiscus nagatensis, Kishinouye, 1902, Journ. Science College, Tokyo, vol. 17, art. 7, p. 6, plate i, figs. 3-6. 



The 8 adradial lobes are united in pairs, so that the 4 perradial notches are about twice 



as deep as the 4 interradial. These 

 8 adradial lobes are bent at right 

 angles to the oral side. The disk 

 has the shape of a Greek cross. 

 Peduncle 4-chambered in adult. 

 Well-developed, interradial, longi- 

 tudmal muscles in the subumbrella. 

 Marginal muscle divided into 8 U- 

 shaped pieces. No primary tenta- 

 cles. Adradial tentacles short, adhe- 

 sive, in clusters of 5. Gastral fila- 

 ments branched, few in number. 



Gonads, 8 broad, adradial bands of laterally oblong sacs. Color variable, matching its 



surroundings. Japan. 



Genus HALICLYSTUS Clark, 1863. 



Haliclystiis, Clark, 1S63, Journ. Boston Soc. Nat. Hist., vol. 7, p. 559; 1878, Smithsonian Contributions to Knowledge, . Article 

 2, Part. 2. — AiiASSiz, A., 1865, North Amer. .Val., p. 63.— Haeckel, 1S80, Syst. der Medusen, p. 387. — Kishinouye, 

 1S89, Proc. U. S. National Museum, vol. 22, pp. 125, 129. — Maas, 1904, Result Camp. Sci. Prince de Monaco, fasc. 28, 

 p. 43; 1906, Fauna Arctica, Bd. 4, Lfg. 3, p. 499. — Gross, 1900, Jena. Zeit. fur Natun\-issen, Bd. 33, p. 614 (anatomy). 



Lucernaria, Bergh, 18S8, Vidensk. Meddel. Naturhist. For. Kjobenhavn, p. 214 (embryology). 



The type species of this genus is H. auricula from the Atlantic coasts ot Europe and of 

 New England, United States. 



GENERIC CHARACTERS. 



Stauromedusae similar to Lucernaria but with 8 perradial and interradial marginal 

 anchors, and with a 4-chambered, aboral peduncle. The embryology has been studied b}' 

 Bergh, 1888, and is similar to that o( Lucernaria, excepting that in Lucernaria the 8 anchors 

 become lost as growth proceeds. 



Fig. -^^S. —Kishinouyea nagatensis, after Kishinouye, 

 in Jour. Col. of Science, Tokyo. 



