HYDROIDA II 



Upright colonies with polysiphonie, irregularly ramified main stem, and regular singly or 

 doubly pinnate branches; the outer, minor branchlets regularly alternating. The hydrothecae small, with 

 exjDanded margin, especially on the adcauline side; the basal cavity is large, somewhat asymmetrically 

 developed, with a markedly convex adcauline wall and a straight or slightly concave abcauline wall, 

 inserted asymmetrically on a laterally placed apophyse at the distal end of the inter nodium. The 

 branches are divided into internodia, which often exhibit one or two basal constrictions. 



The gonothecse proceed from the tubes of the stem. They are large, somewhat flattened, and 

 furnished with spiny longitudinal ribs on the flat side. 



Material: 



"Ingolf" St. 29 65°34' N., 54^ 1' W., depth 68 fathoms 0,2° 



- 34 6 5 °i 7 ' N, 54 i 7 ' W, - 55 



- 84 6 2 ° 5 8' N, 2 5 °2 4 ' W, - 633 4,8° 

 "Thor" 65°52' N., 23°58' W., — 62 metres 



64°i6' N.. 22°i7' W., - 50 — 

 64*16' N„ ii°i 5 ' W, - 378 - 

 Greenland: Egedesminde (without further details) 



Store Hellefiskebanke ( — — ) 



Store Hellefiskebanke depth 24 fathoms 



Davis Strait ( — — — ) — 100 — 



Ingmikertok, Augmagsalikfjord (East Greenland Expedition) 

 Iceland: Mouth of Hornafjord (depth not stated) 

 Rodefjord, depth 80 fathoms 

 Djupivogr — 8 — 

 Vestmano — 10—15 — 

 10 miles W. of Akranes (depth not stated) 

 Stykkisholm, depth 30 fathoms 



Bredebugt 65°i7' N., 23°32' W., depth 7 — 12 fathoms 

 Adelvik (depth not stated). 

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

 6 miles N. by W. of Store Kalso, — 60 — 



Deep hole at north point of Nolso — 100 — 



5 miles SSE. of Bispen — 50 — 



Forma abyssalis: 



"Ingolf" St. 125, 68°o8' N., i6°02' W.; depth 729 fathoms, —0,8° 



HaLecium muricdtum, with its asymmetrically developed hvdrotheca stalks or basal cavities 

 and its slenderer form, stands out distinctly from the remainder of the northern Halecium species, and 

 is not easily confused. It is as a rule finely built, but may occur in large colonies with highly rami- 

 fied polysiphonie main stem; the ramification then mostly proceeds in a main plane, but can also be 

 altogether irregular, so that the colonies assume a quite bushy appearance. The margin of the hydro- 



