PENNATULIDA. 65 



The specimen Nr. 9 deviates from all the others in having the lateral polyps in the uppermost 

 part of the rhachis arranged in (almost) opposite pairs; three such pairs are present (PI. I, fig. 14); 

 between the two polyps of the uppermost pair the rhachis ends as a little knob (k) containing the upper, 

 fine end of the calcareous axis, and provided with one ventral zooid at all events for one of the 

 two polyps. 



The spicules on the calyx have a length of 0.5280.800""" and a breadth of 0.032 o.O48 mm ; on 

 the tentacles, the spicules are 0.096 0.176""" long and o.oo8' nm broad. 



Occurrence. The specimens of the Ingolf have been taken at the following places: St. 24, 

 63 06' N. Lat, 56 W. Long., 1199 fathoms, bottom-temp. + 2 4 C. (10 specimens, Nr. 17, 911, and 

 some fragments of the rhachis of other specimens); 81.41, 61 39' N. Lat, 17 10' W. Long., 1245 fathoms, 

 bottom-temp. -4- 2 C. (i specimen, Nr. 8). 



The specimen of Verrill was obtained south-west of Nantucket Island, 39 59' 45" N. Lat, 68 

 54' W. Long., ca. 700 fathoms; those of Studer, on the other hand, are from the Pacific, o 4' S. Lat, 

 90 24' 30" W. Long., 885 fathoms, 23 59' N. Lat, 108 40' W. Long., 995 fathoms, i 7' N. Lat, 80 21' 

 W. Long., 1573 fathoms. With regard to the Atlantic I imagine that the distribution will be found to 

 comprise the whole of the warm area at great depths and on soft bottom. 



Fam. Anthoptilidce Roll. 

 Anthoptilum K611. 



To the characteristics of the genus pointed out by Kolliker may be added, that the stem of the 

 colony is very much bent so as to form a large curve almost in the middle, and further that it may show 

 smaller curves, so that its form may be somewhat like an S; the concave side of the chief curve is 

 formed by the naked dorsal surface of the colony. All the figures of Kolliker show this curve, but 

 as it is not mentioned, it might be supposed to be individual, or even to have appeared in the pre- 

 served state. The many specimens that I have had the opportunity of seeing, taken directly from 

 the bottom of the sea, show with certainty that the curved form is a natural feature of the colony, 

 being already distinctly marked in small specimens. The stem ends above in a naked, longer or shorter 

 cone without any terminal individual. The sexual organs are found in the polyps themselves. 



The calcareous axis, as stated by Kolliker, is round, in so far as it has no edges; but it is 



distinctly compressed from the sides; it is thickest at the beginning of the chief curve or a little below 



this, but a more conspicuous swelling of the calcareous axis, corresponding to the elliptical thickening 



of the upper part of the peduncle which is a peculiarity of the genus, is not found (as in Pavonaria 



finmarchica and Halipteris christii). 



The genus is hitherto known only from the Atlantic, where it occurs from the most northern 

 to the most southern regions, but only at great depths. 



The Ingolf-Expedition. V. i. q 



