HYDROIDA II 



mobile sarcothecse. The hydrocladia are divided by transverse nodes into internodia- of which normally 

 every second one bears one or two unpaired sarcothecse in the median line, the alternate ones having 

 a small hydrotheca with a supracalycine pair of sarcothecse at the mouth, and an unpaired median sar- 

 cotheca on the proximal part of the internodium. .The hydrotheca is about '/s to '/ 3 the length of the 

 internodium, and is on one side entirely fused therewith. 



The gonothecse are attached by an almost rudimentary stalk to the apophyses; they are oval 

 to pear-shaped, with a distally laterally placed asymmetrical opening. 



40 



200 m. _. 600/7- ... looom. 2ooom. 



Fig. XXXI. The distribution of Nemertcsia antcnnina in the Northern Atlantic. 

 In the hatched parts the literature notes a scattered although common occurrence. 



Material : 



"IngolP St. 87, 6502,3' N., 23s6,2' W.; depth no fathoms 



92, 6 4 44' N., 3 252' W.; 976 1,4 



- 98, 6 5 3 8' N, 26=27' W.; - 138 5,9 



Greenland: Davis Strait, 80 (without further details) 



6 5 2 7 'N, 5445'W.; - 67 



Iceland: 5 miles E. of Seydisfjord, 135 



The Faroe Islands: Deep hole at the north point of Nolso, depth 100 fathoms. 



Some luxuriant colonies from Davis Strait exhibit interesting variations in the number of 

 hydrocladia. The nodes of the stem are slightly marked, and each internodium bears but three apo- 

 physes; owing to the revolution of the internodia therefore, these colonies or parts of colonies are six- 

 rowed; among these colonies again there are others, or in the single colony, other parts, which in a 



The Ingolf-Expedition. V. 7. 9 



