ACALEPHJE. 115 



are in close proximity to each other at the base of the double feelers. 

 The male are the least numerous, the form oval, slightly medusan, 

 the nucleus as it ripens passing from red to yellow : there are four 

 radial canals and a circular canal, the mantle lying close to the 

 nucleus and having an opening. The female appendages are smaller 

 and round, but of similar structure, except that the central vessel of 

 the nucleus is not developed, for each appendage contains only a 

 single egg. Compare the interesting observations and figures of 

 MILNE EDWAKDS Ann. des Sc. Nat. 2e Serie Tom. xvi. Zool. pp. 

 217229, PI. 710. Also R. Anim. Cuv. ed. illustr. Zooph. PI. 

 59. See LEUCKAKT Zoolog. Untersuch. Erster Heft. s. 38. 



Forskalia KOELLIKER. 



Sp. Forskalia Edwardsii KOELL. This new genus and species differs little, if 

 at all, from Stephanomia according to LEUCKAKT. See the description and 

 beautiful figures in KOELLTKEB Die Siphonophoren v. Messina, s. i 10. 

 Taf. I. II. 



Agalmopsis SARS. Swimming column formed of two rows of 

 bells alternating. Below it, the stem gives origin to single Polyps, 

 feelers, prehensile filaments and sexual organs with numerous 

 transparent bracts or covers. 



Sp. Agalmopsis elegans SARS, Fauna littor. Norvegice I. p. 36, Tab. v. fig. 7, 8. 

 The prehensile filaments give off branches which again subdivide to terminate 

 in two threads : a contractile bladder is seated below the point of last divi- 

 sion, and immediately before this is a spiral nettle-node covered by a bell- 

 shaped duplicature from the filament on which it is placed. Agalmopsis 

 punctata KOELL., a new species, differs from the last in the branches of the 

 prehensile organs having the node without a cover, and in terminating 

 without further division: also the feelers have special prehensile organs 

 which are knotted. 



Agalma ESCHSCH. Swimming column with bells in two rows : 

 feelers scattered. Polyps with bracts and prehensile organs of 

 which the lateral branches are provided with a large nettle-node 

 and subdivide to terminate in two threads having a contractile 

 vesicle between them at the division.] 



Sp. Agalma Okeni ESCHSCH. Isis xvi. 1825, Tab. 5, SysL der Acaleph. p. 151, 

 Tab. Xiii. fig. i. 



[Apolemia ESCHSCH. Swimming column composed of two rows 

 of bells of quadrangular form with rounded angles. Feelers from 

 two to four set on the stem between successive pairs of bells. 



82 



