PENNATULIDA. en 



being found hanfenweise an der Dorsalseite des dorsalen Kanales >, developed verv beantifnlly and in 

 considerable numbers. I shall add that it was easy for me to ascertain that these canals, the connec- 

 tion of which with the polyps K. could not explain, open into a network of other canals which are 

 again directly connected with the polyps and with the gastric sacs of the zooids placed between the 

 polyps; similarly, the dorsal zooids are connected with the dorsal main canal; on the other hand, the 

 narrow lateral canals do not here, any more than in m o s t other Pennatnlids that I have examined 

 in this respect, show any connection with polyps or zooids. 



After to what has been said above, it will now be possible to give the following altered diag- 

 nosis of the species Pr. thomsoni K611. : 



Rhachis long (longer than the peduncle), cylindrical or somewhat compressed; the dorsal 

 median streak distinct, the ventral one forming a fine line often indistnict or interrupted; the polyp- 

 calyxes with the whole axial side of the polyps embedded in the ccenenchyma, the abaxial side 

 provided with slightly marked teeth, most frequentl)- three; all the tentacles with a la>er of spicules 

 along the aboral side of the stem. The polyps of either side arranged in up to four longitudinal 

 rows; in developed colonies the pohps further form obliqiie rows rising towards the dorsal sur- 

 face, and containing up to six polyps. The colour of the calyxes of the polyps and zooids is red in 

 different shades, sometimes bright red; the retractile part of the polyps, the corresponding part of 

 the zooids, the dorsal median line on the rhachis, and the peduncle colourless or yellowish white. 



Occurrence. This large species is onh- known from the warm area within the northern part 

 of the Atlantic, viz. from 36° 37' N. Lat, 7" 38' W. Long, 322 fathoms (the « Porcupine Expedition, the 

 four type-specimens of Kolliker); from the fjord-regions of Norway and the adjoining region: the 

 Vest Fjord {P. <ilqfotcnsc -^ ^ P. molini , P. carinahtm ) 160—341 fathoms; west of the mouth of the Sogne 

 Fjord {<!.P. armatum.i), 206 fathoms; the Bergen Fjord (Nr. 3 and 7 of the table, taken by Dr. Appellof), 

 150 — 200 fathoms; mouth of the Sulen Fjord (Nr. 8, 9, 10, taken by the Michael Sars»), 215 — 220 fathoms; 

 finalh- from the Skager Rak { Pr. Gmihildce.'^ Nr. 11, taken by Bovallius and Theel), 440 fathoms. 



This species therefore, does not seem to be a marked deej^-sea form. It will probably — like 

 other European Pennatnlids from the same region — prove to be indigenous also on the American 

 side of the Atlantic, on the slopes of the banks at the Faeroe Isles and Iceland etc. 



Protoptilum denticulatum n. sp. 



PI. I, Figs. 9 — II. 



(Rhachis short; the polyps arranged in one row on either side; dorsal zooids likewise, separated 

 by a narrow, naked dorsal streak; ventral zooids also in one row on either side, but a ventral median 

 streak is not distinct). Polyp-calyx with 8 (the terminal polyp) or 6 distinct and long teeth 

 supported by spicules; the polyps with a strong layer of spicules on the tentacle-stem; the calyx of 

 the zooids provided with two teeth (the terminal zooid with three teeth on the calyx); the spicule- 

 formation very abundant; the colony colourless. 



In the Atlantic, to the south-east of the southern point of Greenland, the singolf has taken 

 a small Protoptilum differing so much from the hitherto described species, that it must be established 



