270 FORSKALIA. 



physaliae (p. 320). Neither Bedot ('93a), Chun ('97b), nor Schneider ('98) 

 recognize more than the one genus of Forskahidae, Forskalia; this view is 

 undoubtedly correct. 



Lens and Van Riemsdijk have included the little-known genus Erenna 

 among the Forskaliidae. And this course is followed in the present Memoir, 

 though the location of this genus is only provisional (p. 271). 



FORSKALIA Kolliker, 1853. 



The synonymy of Forskalia is perhaps more confused than that of any 

 other Siphonophore genus. Bedot ('93a) and Schneider ('98) the two authors 

 who have most recently attempted to revise its species have come to very dif- 

 ferent results; the former recognizing five, the latter three species. The rela- 

 tions between the two sj^stems are shown in the following table: 



Bedot ('93a). Schneider ('98). 



F. contorta Milne Edwards (partim). 

 F. leuckarti Bedot (= contorta 



Leuckart) 

 F. cuneata Chun 



F. edwardsi Kolliker } = F. ophiura Delle Chiaje. 



F. tholoides Haeckel 

 F. contorta Milne Edwards (partim) 



\ = F. contorta Milne Edwards. 



F. hydrostatica Delle Chiaje. 



Chun ('97b) recognizes three Atlantic species, F. contorta Milne Edwards, 

 F. ophiura (Delle Chiaje) Leuckart, and F. cuneata . Chun. Lens and Van 

 Riemsdijk report F. contorta Milne Edwards, and F. edwardsi Kollikei' from 

 the "Siboga" collection. 



The key given by Schneider ('98, p. 199) is: 



1. Nectophore with red pigment spots on the subumbral canals; contorta: 



2. Nectophore with yellow fleck on the velum; ophiura: 



3. Nectophore without pigment spots ; hydrostatica. 



Bedot ('93a, p. 250) likewise bases his diagnosis chieflj^ on color. 



It is hopeless to arrive at any sound conclusion as to the respective value 

 of these schemes without a study of extensive series of living or well-preserved 

 material of the different forms. It is especially necessary to test the constancy 

 of the relatively trivial characters, e. g. pigmentation and shape of the necto- 

 phores, and shape and relative size of the appendages of the siphosome, by 



