l6 MEDUSA. I. 



ground-plane, and though the peculiar structure of the gonads of Cliromatone?na places that genus in 

 opposition to the other members of the family Laodiceida, this structure does not contradict the 

 supposition of a generic relationship. 



The parallel between the structure of the gonads of Chromatonema and of the Tiarida- men- 

 tioned above is hardly a casual one. There is, in fact, a striking resemblance between the gonads of 

 Chrotnatonema and the eight adradial rows of gonadial sacks, communicating with the bell-cavity 

 through transversal fissures in the outer surface of the manubrium in a Calycopsis (see the figure of 

 Bigelow, copied by Hartlaub, 1913, P- 347- and the transversal section, Vanhoffen, 1911, Textfig. 

 loa, p. 216, copied by Hartlaub, 1913, p. 348. Compare also Hartlaub's Fig. 238, (1913, p. 287) of 

 the gonads of a young Lciickartiara octona^ seen from the inner side of the manubrium). The impor- 

 tance of the resemblances between the gonads of the Tiaridce and the gonads of Chroviatonema and 

 the other Laodiceidcr is mentioned above in the introduction to the family Laodiccidcr (pp. 6 — 7). The 

 marginal appendages of Chrojnatonevia and their relations to the corresponding organs of the other 

 Laodiceidce and the Tiarida were also mentioned above. 



Thus my considerations with regard to the systematical position of C/ironiafonenia lead to the 

 result, that it belongs to the family Laodiceidcr^ among which it takes a low position, presenting several 

 features pointing to the connection with the Tiaridce. Its position among the Laodiceida is, however, 

 not only a low, but also in certain regards a singular position, particularly owing to the peculiar 

 structure of the gonads, and it seems probable that the genus has arisen from some other group of 

 Tiarido' than the predecessors of the other members of the Laodiceidcr. 



Genus Laodicea Lesson. 



Laodicea undulata (Forbes & Goodsir). 



Plate II, figs. 1—8. 

 '^Medusa cruciata Forskal 1775. Descriptiones Animalium, p. no. — 1776. Icones rerum naturalium. 



Tab. 5, Fig. A. 

 Thauman/ias undulata Forbes and Goodsir 1851. — Transact. Royal Soc. Edinb. Vol. XX, p. 313. 



Plate 10, fig. 7. 

 — mediferranea Gegenbauer 1856. — Zeitschr. wiss. Zool. Bd. VIII, p. 237. Taf. 8, Fig. 1—3. 



Laodicea calcarata A. Agassiz, in L. Agassiz 1862. Contrib. Nat. Hist. U. S. Vol. 4, p. 350. 

 Laodice ulothrix Haeckel 1879. System d. Medusen, p. 133. Taf. 8, Fig. 5 — 7. 

 Laodicea maraDia A. Agassiz and Mayer 1899. Acalephs, Fiji Islands. — Bull. Mus. Comp. Zool. Vol. 



XXXII, p. 162. Plate 3, figs. 7—8. 

 Laodice indica Browne 1905 b. — Pearl Oyster Fisheries, Suj^pl. Rep. 27, p. 136. Plate I, fig. 5; Plate IV, 

 figs. 7 — II. 

 — — Browne 1907. Revision of the . . . Laodiceidse. — Ann. Mag. Nat. Hist. Sen 7, Vol. XX, 



p. 460. 

 Laodicea cruciata Mayer 1910. Medusae of the World, p. 201. Textfigs. 104 — 105. Plate 21, figs. 4 and 5; 

 Plate 22, figs. 2 — 6; Plate 23, figs, i — 3. 

 Bigelowi Neppi et Stiasny 191 1. Zool. Anz. Bd. 38, p. 396. 



