HYDROIDA 



53 



Perigonimus rcpois is a soutliern species which penetrates into our seas. It has been recorded 

 from the Mediterranean and the west coast of France, and occurs frequentU- in the sea round Great 

 Britain and Ireland. Already in the North Sea its occurrence is more straj^gling. In the Danish 

 waters and along the coast of Bohusliin it is still rather frequent. On the coast of Norway it is not 

 unfrequently met with in the Trondhjemfjord, where the fauna, on the whole, bears a southern char- 

 acter. But only once it has been found farther to the north, at lyofoten. S;emundsson (1911) re- 

 cords several questionable specimens from the west and the north of Iceland. But these localities 

 have to be confirmed. As a new localit\- must now be added the Faroe Island.s. The species belongs 

 to the literal region. 



200 m, 600/7' jooom. , 2ooom- 



Te.xt-fig. p. The distributiou of Pcngoniniui r,-pnis in the Northern Atlantic (o locahties needing further confir- 

 mation. — In the hatclied region the litterature denotes a scattered aUhough common occurence of the species). 



Perigonimus abyssi G. O. Sar.s. 

 1874 Perigonimus abyssi, G. O. Sars, Bidrag til Kundskaben om Norges H\droider, p. 96, pi. 5, Fig. 27—30. 

 191 1 — sp., Kramp, Danmarks-Ekspeditionen til Gronlands Nordostkyst, p. 363. 



From the reptant stolons proceed unbranched polyp stems, which attain a length of 1.5 mm. 

 The polyps are about 0.5 mm. long, broadly fusiform, bearing 5—8, usualh' 7 tentacles in a whorl. 

 Below the teutacles the polyp is surrounded by a rather vigorous, wide, jellied pseudohydrotheca, which 

 is, however, often hardly visible on the polyp wholly extended. The polyp stems are irregularl}- and 

 strongly wrinkled, and have a dark-coloured, vigorous perisarc. 



The gonophores are developed into free medusae, having, when deliberated, a vigorously 

 developed umbrella and four tentacles. The gonophores are developed on the polyp stems, to which 

 thev are attached by a very short stalk. On the polyp stem arise one or two gonophores. 



