1914] Bigelotv: Notes on the Medusan Genus Stomolophus 241 



From the zoogeographical standpoint the demonstration that the 

 same species of Stomolophus occurs both in the Pacific and Atlantic, 

 but limited to American waters of comparatively high temperature in 

 both, and the fact that this genus is unknown elsewhere, is of consid- 

 erable interest as adding another instance to the list of littoral Medusae 

 which are found on both sides of temperate and Central America; a 

 phenomenon which I have discussed elsewhere (1909, p. 227). Hence 

 Mayer (1910, p. 711) is justified in saying that S. meleagris has re- 

 mained unchanged since the closure of the Isthmus in Mesozoic times. 



Museum of Comparative Zoology, Harvard University, 

 Cambridge, Mass. 



Transmitted August IS, 1914. 



LITERATURE CITED 



BiGELOW, H. B. 



1909. Eeports on the scientific results of the expedition to the Eastern 



Tropical Pacific ... by the U. S. Fish Commission Steamer "Alba- 

 tross. ' ' XVI. The Medusae, Mem. Mus. Comp. Zool., Harvard College, 

 37, 243 pp., 48 pis. 



Haeckel, E. 



1880. System der Acraspeden. Zweite Halfte des System der Medusen. 

 Jena Denkschr., 1, 361-672. 



Mayer, A. G. 



1910. Medusae of the World, vol. 3, The Scyphomedusae. Publ. Carnegie 



Institution, 109, 499-735, pis. 56-76. 

 Trinci, G. 



1906. Sopra una Diseomedusa del Golfo di Paria (America del Sud). Ann. 

 Museo Zool. E. Univ. Napoli (2), 9, 1-4. 

 Vanhopfen, E. 



1888. Ueber semaeostome und rhizostome Medusen. Bibl. Zool., 1, Heft 3, 

 51 pp., 6 pis., 1 map. 



