HYDROIDA II 



105 



200 m. 600 m. .^ 1000 m. 2000 m. 



Fig. LVI. Finds of Sirtiilai-flln trtu-llu in tht- Northern Atlantic; 

 In the hatched regions the data are not altogetlier precise, (o doubtful locality). 



Sertularella fusiformis Hincks. 

 1861 Scrtiilaria fiisiforDiis^ Hincks, A Catalogue of the Zooph\te.s of South Devon, p. 253, pi. 6, figs. 7 — 8. 

 1868 Sertularella fiisiforiiiis, Hincks, A History of the British Hydroid Zoophytes, p. 243, pi. 47, fig. 4. 

 1907 Sertularella pellueida, Jaderhohn, Uber einige nordische Hydroiden. 

 1909 Sertularella pelluciila, Jaderholm, Northern and Arctic Invertebrates, p. 99, Taf. 11, figs. 8 — 11. 



Open and fineh' built, zigzag and slighth' branched upright colonies with nionosiphonic stem. 

 The stem and branches are divided into short internodia which form an angle one with another, and 

 are more or less distinctly ringed, more rarely quite smooth. From the same internodium may often 

 proceed two or three branches, or simple internodia. The large, somewhat spindle-shaped hydrothecae 

 are situate on the outer half of the internodium, and are very slightly embedded ; the opening part 

 is again as a rule somewhat expanded; the aperture is set perpendicularly to the axis, and has four 

 not very prominent teeth, between which are attached four triangular lid plates. 



The gonothecae are attached to the branches or stolons. They are elongated oval to egg- 

 shaped, in the latter case with the broader part somewhat below the middle. The gonotheca has a 

 distal central aperture with four strong teeth. 



Material : 



"Ingolf St. 3 63°35' N., io°24' W., depth 272 fathoms, 0,5' 



The Ingolf-Expedition. V. 7. 



14 



