r n 



* 





HE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY, 



[FIFTH SERIES. 



No. 63. MARCH 1883. 



On the Cyclical Development and the Relationships 



of the Siphonophora. By Dr. Carl Chun*. 



[Plate V.] 



I. The Cyclical Development of Monophyes primordialis, 



Chun. 



In the year 1853 Leuckart f ascertained the remarkable 

 fact that the appendages united in groups on the stem of the 

 Diphyidae break loose from each other, and lead a free exist- 

 ence separated from the colony. A whole series of supposed 

 distinct species distributed under the genera Eudoxia and 

 Erscea (the u monogastric Diphyidae") thus proved to belong 

 to the developmental cycle of the Diphyidae. When after- 

 wards attention was called by Huxley J, Pagenstecher§, and 

 Claus || to certain very simply constructed small Siphono- 

 phora with only one nectocalyx, which, following Claus, we 



* Translated by W. S. Dallas, F.L.S., from the ' Sitzungsberichte der 

 k. nreuss. Akademie der Wissenschaften/ 1882, pp. 1155-1172, Taf. xyii. 



T i Die Siphonophoren. Eine zoologische Untersuchung/ 1853, p. 56. 



X 'The Oceanic Hydrozoa/ (Ray Society) 1859, p. 50, pL iii. fig. 4. 



§ u Eine neue Entwicklungsweise bei Siphonophoren," zeitschr. fl wiss. 



Zool. xix. p. 244. 



(I 'Schnften zoologischer Inhalts. II. Die Gattung Monophyes, 

 Clans, und ihr Abkommling Diplophysa, Gegenb*/ Taf. iv. 



Ann. & Mag. N. Hist. Ser. 5. Vol. xi. 11 



