STAUROMEDUSiE — STENOSCYPHUS. 



525 



GENERIC CHARACTERS. 



SiaLiKiiiiedusx with simple, uiulcft liell-niai<;in without adradial lobes. With 8 for 12?) 

 penadial and intenadial maiginal "anchors," 8 (or 12 ?) adradial (.liistcrs of knohhcd tentacles. 

 With a rini;-shaped, entire, coronal muscle. Stalk ol' attachment is 4 (or 6?) chambered. 

 Stomach 4-chambered as in the Eleutherocarpidae. Gonads interradial or on both sides of 

 the interradii. 



Kishinouye would constitute for S. inabaia. new family, the Stenoscyphidx, which would 

 be intermediate between Haeckel's Tesseridae and Lucernaridse. S. inahai has a 4-chambered 

 stalk and 8 separate, adradial gonads. 



Broch, 1907, describes a medusa which may belong to the genus Stcnoscyphiis but which 

 has 12 (6 perradial and 6 interradial) marginal anchors and 12 adradial clusters of tentacles. 

 The mouth is 6-rayed instead of 4-rayed, as in S. inabai. A variation in the number of rays 

 may be expected in these degenerate medusa; and it seems inexpedient at present to sepa- 

 rate the 6-rayed from the 4-rayed form. 



Stenoscyphus inabai Kishinouye. 



Depastrum inabai, Kishinouye, 1893, Zool. Mag. Tokyo, vol. 5, p. 416. 



Stenoscyphus inabai, Kishinouye, 1902, Journal College Science, Tokyo, vol. 17, art. 7, p. 2, plate i, figs, i, 2. 



About 25 mm. long, elongate, narrow, funnel-shaped, and quadratic in cross-section. 

 Stalk with 4 interradial grooves. Exumbrella smooth; subumbrella beset with large, urn- 

 shaped groups of nematocysts. The 8 principal tentacles are large, round, adhesive bodies 

 (anchors). Secondary tentacles are short and knobbed, and arranged in 8 adradial clusters 

 of about 25 each. There are neither arms nor lobes to the subumbrella. The ring-like coronal 

 muscle is well developed and entire. 4 long, deep, interradial, gastrogenital pits extending 

 to the aboral end of the bell. 8 gonads, in form of 4 pairs of bands along the interradial 

 muscles. Each gonad composed of 40 sacs in 2 rows. 



Color dark brown flecked with white, anchors red, gonads brow-n. 

 Subumbrella pale-green, manubrium yellowish. 



Kata-ura, Kii Province, and Misaki, Japan. In winter. Rare. 

 Attached to Sargassum. The animal can detach itselt from the Sar- 

 gassum "at will" and can crawl about, using its oral 

 and aboral adhesive organs, thus effecting a locomo- 

 tion resembling that of a leech. It can not swim by 

 pulsations of the bell. 



Stenoscyplius (?) hexaradiatus Broch. 



Sienoscvphus (?) hexaradiatus, Broch, 1907, Hydroiden und Medusen, 

 Report Second Norwegian Arctic Expedition in the Fram, No. 12, 

 p. 9, taf. 2, fign. 3-6. 



Bell-shaped, with a cylindri- 

 cal peduncle somewhat longer 

 than height of bell. Bell about 

 6 mm. wide, total height of stalk 

 together with bell 10 mm. Throat- 

 tube short, 6-sided. Peduncle pro- 

 \ ided with 6 longitudinal muscles. 

 12 marginal anchors, 6 radial and 

 6 interradial. These are shaped 



Fig. 334. — Stenoscyphus iiiabia, after Kishinouye, in 

 Tokyo, Japan 



our. College of Science 



Fig. y,$.— Stenoscyphus hexaradiatus, after Broch, in Report of the Second yg^y niuch aS Ordinary tentacles, 

 Norwegian Arctic Expedition in the "frarn." ^^^^ ^^^^ .^^ ^^^ ^.^^^^ .^^ ^ ^^^^_ 



like form, and each provided with an ahaxial cushion. Tentacle-clusters arranged in 12 adradial 

 groups, each composed of 7 to 10 tentacles which arise in several rows from the bell-margin. 

 Amono- each cluster of suctorial tentacles there are one or more tentacles which resemble the 

 marginal anchors. 6 horse-shoe-shaped, folded gonads with their convex sides abaxial. The 

 two wings of each horse-shoe do not extend to the circular muscle. Color ( ?) 



