118 



MKDUS.E OF THE WOULD. 



give rise to alternate side branches. The hydranths are cluh-shaped and bear 12 to 20 short, 

 filiform tentacles, scattered over their whole sides. The medusa-buds arise singly from the 

 side branches close under the neck of the lateral hydranths. Pictet, 1893, found a very similar 

 or identical hydroid at Amboina, Malay Archipelago. The principal references to this clava- 

 like hydroid are as follows: 



DenJroflava Johrnii, WEISMANN, 1893, Entstehung Sexualzellen bei Hydromedusen, Jena, pp. 



26, 215, taf. 12, fign. 6-9. DU PLESSIS, 1888, Reeueil Zool. Suisse, tome 4, p. 531 (from 



Villefranclie). 

 DenJroclava dohrni, PICTET, 1893, Revue Suisse Zool., tome I, p. 6, plate I, figs. I, 2 (from 



Amboina). 



It does not seem probable that Dcndroclava dohrni produces a Pandea-like medusa, for it 

 is well established by Brooks that Tumtopsis nutricula comes from a DenJroclava hydroid. 



Pandea conica Lesson. 



Dian<ta conica, p_i OY IT GAIMARD, 1827, Annal. des Sci. Nat., tome 10, p. 182, plate 6 A, figs. 3, 4. 



Pandea conica, LESSON, 1843, Hist. Zooph. Acal., p. 288. HAECKEL, 1879, Syst. der Medusen, p. 54. MAAS, 1904, Result. 

 Camp. Sci. Prince de Monaco, fasc. 28, p. 16, plate i, figs. 6, 7 (figures of gonads). BEDOT, 1905, Revue Suisse de 

 Zool., tome 13, p. 141 (literature, 1827-50). LOBIANCO, 1903, Mitth. Zool. Sta. Neapel, Bd. 16, p. 217. 



Oceania setiecimcostata, KOLLIKER, 1853, Zeit. fiir wissen. Zool., Bd. 4, p. 324. 



Oceania conica, GEGENBATR, 1856, Zeit. fiir wissen. Zool., Bd. 8, p. 221, taf. 7, fign. 1-3. 



Bell with barrel-shaped sides, and bluntly pointed or concave apex; 21 mm. high, 10 mm. 

 wide. There are 8 to 24 well-developed, longitudinal rib-like ridges in the tentacular radii on 

 the exumbrella, and an equal number of marginal tentacles with abaxial ectodermal ocelli. 

 Stomach wide and short with 4 folded lips having sinuous margins. The gonads consist ot 4 

 crescentic, reticulated, swollen regions in the ectoderm of the 4 interradial sides of stomach, 

 the convexity ot the horseshoe pointing aborally. These gonads are not completely separated 

 in the adult, in the 4 principal radii, so that they surround the stomach on all sides. 

 The best figures illustrating their structure are given by Maas, 1904. 



Stomach brownish. Gonads and 

 tentacle-bulbs brownish-red. Tentacles 

 yellowish-milky. Ocelli dark-purple. 

 Common in the Mediterranean. 

 This medusa was quite common 

 during the winter of 1907-1908 at 

 Naples, Italy. When young the 4 inter- 

 radial gonads are completely separated, 

 but later they fuse more or less over the 

 perradii, forming a complete, swollen 

 network which girdles the stomach. 

 The prominent longitudinal ridges over the exumbrella arise after the tentacles begin to 

 develop and extend upward from the bases of the tentacles toward the bell-apex. The table 

 gives a growth-record obtained by the author from specimens of this medusa observed at 

 Naples. (See fig. 63, page 117.) 



Pandea saltatoria Lesson. 



Oceania saltatoria, SARS, 1835, Beskriv og Jagtt., p. 25, plate 4, fig. loa-r. 



Pandea sallatoria, LESSON, 1843, Hist. Zooph. Acal., p. 290. HAECKEL, 1879, Syst. der Medusen, p. 54. BEDOT, 1901, Revue 

 Suisse de Zool., tome 9, p. 485; Ibid., 1905, tome 13, p. 141 (all literature to 1850). 



Bell 8 mm. high, 6 mm. wide, with a pointed apex and rounded sides. Exumbrella with 

 only 12 to 16 longitudinal lines of nettling-cells instead of about twice as many as in P. conica. 

 24 to 32 tentacles; twice as many as the lines of nematocysts, instead of being equal to these in 

 number as in P. conica. Ocelli on outer sides of tentacle-bulbs. Stomach slender, lips small 

 and simple. Immature (?) Color (?) Coast of Norway, Bergen. 



Pandea minima von Lendenfeld. 



Pand<ra minima, vox LEXDFNKELD, 1884, Proc. Linnean Soc. New South Wales, vol. 9, p. 916, plate 42, figs. 10-12. 



Bell semi-ovate, 3 mm. high, 2 mm. wide. 8 tentacles about as long as bell is high. 8 

 adradial lines of nettle-cells upon the exumbrella. A bundle of nerve fibers is said to extend 

 under each linear series of nettle-cells connecting the clusters one with another! The man- 



