FREE-SWIMMING SPOROSACS OF THE HYDROID GENUS DICORYNE. 



281 



Species of Dicoryne. 



Gonosome. 



Blastostyle. 



Position of 

 Blastostyles. 



On stolon and 

 hydrocaulus 



On stolon and 

 hydrocaulus. 

 [7 on a single 

 hydrocaulus] 



On hydrocaulus 

 only 



Shape of 

 Blastostyles. 



Long, spindle- or 

 vase-shaped, pro- 

 jecting above and 

 below mass of 

 sporosacs 



Long, spindle-shaped, 

 projecting above 

 and below mass of 

 sporosacs 



Very short, almost 

 or entirely covered 

 by mass of sporo- 

 sacs 



Sporosacs. 



No. of 

 Sporosacs on 

 Blastostyle. 



18 to 24 as a rule, 

 exceptionally as 

 many as 34 to 

 40, in globular 

 or elongate 



clusters 



17 to 33, in globu- 

 lar clusters 



[24 to 30], in 

 slobular clusters 



[On stolon] 



Long, spindle-shaped, 

 projecting far 

 above and below 

 mass of sporosacs 



[About 1 2], in elon- 

 gated clusters 



Character of Sporosacs. 



Free-swimming, cili- 

 ated, with 1 tentacle, 

 and female with 1 



ovum 



Free-swimming, cili- 

 ated, with 2 tentacles, 

 and female with 2 ova 

 (exceptionally with 

 1 or 3 ova) 



[Free sporosacs not ob- 

 served Female with 

 2 ova] 



"Generative zooids 

 similar to those of the 

 European species " 

 [i.e. D, confertd] 



Distribution. 



Locality. 



West coast of 

 Scotland, and 

 Ireland, and 

 south coast of 

 England; Gulf 

 of Naples and 

 Western Medi 

 terranean 



Iceland, Nor- 

 way, Sweden, 

 Scotland, Eng- 

 land, Ireland, 

 Denmark, 

 North Sea, 

 Heligoland, 

 Mediterranean 

 Sea 



Norway ; north- 

 west of Shet- 

 land Islands ; 

 Gulf of Maine, 

 Nova Scotia 



South coast of 

 Australia 



Depth. 



Down to 

 about 10 

 fathoms 



14 to 200 

 fathoms 



50 to 150 

 fathoms 



information has necessarily been derived from the figures illustrating the original accounts. 



TRANS. ROY. SOC. EDIN., VOL. LI, PART I (NO. 6). 



40 



