HYDROIDA II 19 



female gonothecse are much compressed, sessile; the male are stalked, with the stalks pressed in among 

 the female gonothecse. There are only a small number of almost spherical male gonothecse in the 

 coppinia; they are freely placed between the surface of the female aggregate and the outer coils of 

 the tubes. The female gonophores are heteromedusoids; the male reduced cryptomedusoids; the fertile 

 colony has nematocysts dimorphously developed. 



Forma typica: The upper (adcauline) wall of the hydrotheca projects 1,5—3 times the diameter 

 of the aperture beyond the tubes; the plane of the aperture is parallel with the axis of the branch. 



Forma brevicyatha: the free portion of the adcauline wall is 0,5—1 times the diameter of the 

 aperture; the aperture itself is turned obliquely upward. 



Material: 



Forma typica: 



"Ingolf" St. 34 6 5 °i 7 ' N., 54°i7' W., 



- 51 6 4 °i 5 ' N., i4°22' W, 



- 87 6 5 °02, 3 'N, 2 3 °56,2'W., 



- 92 64=44' N, 3 2°52' W., 



- 95 6 5 °i 4 ' N, 3 o° 39 ' W, 

 — - 98 65°38' N., 26°27' W., 



"Thor" 66°4 3 ' N., i5°o 3 ' W., 



Greenland: Davis Strait, depth 66 fathoms (without further details) 

 Sukkertoppen, on Bolienia ( — — ) 



Godthaab, depth 50—60 fathoms 

 Hunde-Eiland (without further details) 



Cape Tobin, depth 57 fathoms (East-Greenland Expedition) 

 Jan Mayen: 70°32' N., 8°io' W., depth 470 fathoms 

 Iceland: 4 — 5 miles E. of Bakkefjord, 70 — 



5 miles E. of Seydisfjord, — 135 — 



64°27' N., i3°27' W., — 150 metres 



The Faroe Islands: 6i°40' N., 7°4o' W-, 135 fathoms 



6 miles N. by W. of Kalso, — 60 — 

 Forma brevicyatha: 



The Faroe Islands: 7 miles N. by E. of Myggenses point, depth 57 fathoms 

 6 — N. by W. of Kalso 60 



A rich and well-preserved material of Grammaria abietina from the Trondhjem Fjord afforded 

 an opportunity for further study of the species. Its polyps have an oral part with mainly indifferent 

 endoderm cells above the tentacle whorl; the true gastral endoderm exhibits an altogether uniform 

 development. The base of the hydranth is fastened to the wall of the hydrotheca far in between 

 the tubes of the rhizocaulome, by a wreath of small chitinous bodies; this is the only discernible limit 

 between the hydrotheca and its mother stolon, which are otherwise practically of equal breadth. A 

 study of the coppinia (Broch 1917) brought to light several peculiarities. In fertile colonies we find, 



3* 



