l66 HYDROIDA II 



Laomedea geniculata (Linne) Lamouroux." 

 1758 Sertularia geniculata, Linne, Systema naturae, Ed. 10, p. 812. 



1816 Laomedea geniculata, Lamouroux, Histoire des Polypiers coralligenes flexibles, p. 208. 

 1864 Obelia geniculata, Allman, On the construction and limitation of Genera, p. 372. 



Upright, more rarely branched colonies with zigzag stem, the colony as a rule strongly built, 

 and with an (inner) thickening of the perisarc under the apophyse; the stem and branches without 

 rings. The hydrothecae are borne on short, ringed stalks proceeding from the apophyses. Hydrothecse 

 long, about as long as broad, inversely conical with slightly curved sides. The abcauline side has as 

 a rule a thicker wall than the adcauline. The basal cavity is large, bounded at the top by a strong 

 diaphragm, which, especially in colonies with strongly developed periderm, has a thickened adthecal 

 part. The hydrotheca margin is even, without indication of teeth or convexities. 



The gonothecae are set on short ringed stalks proceeding from the apophyses at the side of 

 the hydrotheca stalks. The gonothecse are slender, inversely conical, with a clearly defined, sharply 

 tapering distal part, and short, narrow central neck. The gonophores develope into free medusae 

 Obelia). 



Material : 



"Thor" 64i6' N., 22i7' W., depth 50 metres. 



6 4 o 2 ' N, 22 33' W, 34 



Iceland: Bakkefjord, depth 25 32 fathoms 

 Seydisfjord, 6 



Vestmano, 25 [labelled Laomedea flexuosa\ 



Reykjavik, 34 



Olafsvik (depth not stated) [labelled Laomedea flexuosa] 

 Stykkisholm, depth 6 9 fathoms 

 Bredebugt, 65i7,5' N., 2322' W., depth 712 fathoms 



65i8' N., 23o2' W., 910 



Dyrafjord, on Laminaria (depth not stated) 

 0nundarfjord, depth 10 fathoms 

 Adelvik, - 55,5 



0fjord, on Lern&a (depth not stated) 

 Grimso, depth 15 fathoms 

 Vidarvig, 13,5 



Thistil fjord, Raudarnes 1.5 miles in S.5iE., depth 18 fathoms. 

 Jan May en, on Laminaria, depth 15 fathoms (East Greenland Expedition). 

 The Faroe Islands: Thorshavn, depth 3 15 fathoms 

 Vestmanhavn, 10 



Solmunde, on Laminaria (depth not stated) 

 Svino, depth 20 fathoms. 



