.\\THilMKDCS.E r.\\T)K\. 



11; 



The type species of PanJea is P. cnnlca Lesson, 1843. This medusa was previously 

 described by Ouoy and Gaimard (1827, Annal. Sci. Nat., torn. 10, p. 182, plate 6) under the 

 name Diantea conica. It is found in the Mediterranean. Haeckel introduced the spelling 

 " PanJ(ta," although Lesson's original spelling is PanJea. The genus "Diantea" was founded 

 by Lamarck (1816, Hist. Anim. sans Vert., torn. 2, p. 505), the type species being Diancea 

 tneJra, a medusa which had been previously described by Pt-ron under the generic name of 

 Lymnorea. Lamarck's genus Duimta also included various species of Geryonta, Oceania, 

 Pelagia, and Mfdusa of previous authors, and is so hopelessly involved that in my opinion 

 it must be dropped. 



GENERIC CHARACTERS. 



Tiarinae with 4 or more well-developed, marginal tentacles. There are 4 interradial, 

 genital ridges in the ectodermal wall of the stomach, but these gonads are only imperfectly 

 separated in the 4 principal radii; so that the stomach is completely encircled by the genital 

 organs, which are, however, better developed in the interradii than in the principal radii. 



DenJroclava is possibly the hydroid of some species of PnnJea, Coins, or Turn's-, but the 

 mature medusa is unknown. 



When set free the medusa of DenJroclava dohrnii (Weismann, 1883, pp. 26, 216, taf. 12, 

 fign. 6-9) has 8 marginal tentacles, 4 radial-canals, and a manubrium with 4 band-like gonads 



i<;. 6j. Pandeei conica. 



A. Side view of half-grown medusa. Bell 13 mm. high. Gonads interradial. 



H. Manubrium of mature medusa, with bell 21 mm. high. Gonads continent, surrounding stomach. 

 C. Manubrium of young medusa, showing interradial gonads. Bell (> nun. lir\;h. l-'rom lit- . I'. 

 the author. Zoological Station, Naples. Winter of 11)07-08. 



on its interradial sides. The sexual cells originate in the ectoderm of the manubrium of the 

 medusa-bud and develop in the ectoderm of the free-swimming medusa, without wandering 

 from their place of origin. The hydroid of DenJroclava dohrnii was found by Weismann at 

 Naples in the summer of 1881, attached to a stock of Isis which was dredged from a depth ot 

 35 to 40 fathoms. The stems are about 35 mm. high and arise from a short, creeping hydro- 

 rhiza, which together with the stems is covered by a smooth, horny perisarc. The main stems 



