APPENDIX. 725 



which are at a level about one-eighth of the height of the bell-cavity above the margin of the 

 bell. There is a well-developed peduncle above the stomach. The 4 radial-canals each give 

 off about 20 branched but non-anastomosing side branches in the subumbrella. Over the 

 peduncle ihe canals do not branch. There is a ring-canal with 4 short inn. i radial, branched, 

 blindly ending centripetal canals. In this voung stage the gonads are not apparent. 



The gonads begin to develop along the 4 radial-canals on the peduncle close to the base 

 of the stomach when the medusa is about 18 mm. high and 15 mm. wide (see text-figure 

 426A). The radial-canals at this point begin to elongate more rapidly than the portion of 

 the peduncle upon which they lie, and thus they begin to loop outward into the subumbrella 

 cavity. Finally these freely-projecting canals twist spirally and hang downward into the bell- 

 cavity, the canal extending around the free edge of a mesentery (figs. 42615 and c). In later 

 stages the bell-margin develops 8 indentations, 4 perradial and 4 interradial, with 8 adradial 

 convexities between. The 8 clusters of tentacles of the young medusa spread laterally as m \\ 

 tentacles develop, until finally the tentacles become congruous entirely around the bell-margin. 



The specimens studied by Maas were from the shore at Yokohama and from the R:us 

 of Tokyo and Sagami, Japan. The largest were 40 mm. high and 30 mm. wide. 



According to Maas the 4 interradial vessels are the only blindly ending canals which 

 arise from the ring-canal, this being contrary to the observations ot other authors. 



Obelia congdoni Hargitt (see page 248, Vol. II). 



Otelia hyalina, CONGDON, 1907, Proc. American Acad. Arts and Sci., Boston, vol. 42, p. 468, figs. 7-9. 

 Obelia congdoni, HARC.ITT, C. W., 1909, Biol. Bulletin, Woods Hole, vol. 17, p. 375. 



Hargitt believes this to be specifically distinct from 0. hyalina Clarke. The branches 

 of the stem do not arise in the axils of the hydrothecx as in O. hyalina. The gonangia are 

 larger, being about 4 times the length of the hydrothecae, and the opening is not simple, but 

 there is a neck with everted rim. Moreover, the colony is 20 to 30 mm. high and profusely 

 branched instead of being about 12 mm. high and but little branched. The newly liberated 

 medusa has 24 tentacles, but within 10 or 12 hours it has 30 to 36. The hydroid is found 

 upon drifting Sargassum and is a tropical form. 



Staurophora mertensii (see page 291, Vol. II). 

 Slaurofihora discoidea, KlSHlNOUvr,, 1910, Journal College of Sci., Univ. of Tokyo, vol. 27, art. 9, p. 29. 



Kishinouye describes this medusa from Japan and Saghalin Island. I believe it to be 

 identical with S. tncrtcnsii. He states that it closely resembles 5. mertensii, but that there 

 are about 30 folds on each side of a limb of the gastric cross, instead of 17 as in S. mcrlcnsn. 

 These folds of the genital glands vary greatly in number and increase with age in the Atlantic 

 Stmn-op/wni; they afford therefore an insufficiently definite criterion upon which to base 

 specific distinctions. 



Cubaia gemmifera. 

 .s. ulinnema gcmmifera, KISHINOUYE, 1910, Journal College of Sci., Tokyo, vol. 27, art. 9, p. 31, plate 5, figs. 32, 33. 



This appears to be an immature Cubaia. The largest of Kishinouye 's specimens was 

 4 mm. wide and medusiform buds were beginning to develop upon its gonads. The distal 

 ends of the tentacles beyond the adhesive disks are longer than in any species of this genus 

 hitherto described. The manubrium is light red with brown mouth. Of the 16 tentacles, 

 8 were with "suckers" and 8 smaller ones were without them. 8 lithocysts. Entoderm at 

 base of tentacles greenish and in the distal parts reddish. Found at'Misaki, Japan, in winter. 



Craspedacusta sowerbii Lankester (see page 363, Vol. II). 

 C.ras/teJacusta sowerbii, Decisions of International Commission on Zool. Nomenclature, 1910, Science, vol. 31, p. 150. 



The International Commission on Zoological Nomenclature publishes its unanimous 

 decision that the name of this medusa is Craspedacusta sowerbii Lankester, not Limnocodium 

 victoria Allman. 



