REPORT ON THE PENNATULIDA. 31 



dorsal middle line. Their numlier is so small that it does not much surpass that of the 



The raehis is cylindrical, with very little sarcosoma. 



The axis is round, and measures in the lower part of the raehis 0"9 mm. in 

 diameter. 



The maximum length of the calcareous needles is 070 to 074 mm., and the 

 breadth 0'14 mm. In the tentacles, needles of 0"40 to 0"45 mm. run up the aboral 

 side of the stem, forming a strong axis, and two or three smaller needles are found in 

 the base of each secondary tentacle. In the sarcosoma of the stalk and the raehis 

 itself the needles are shorter and more slender, and go down to a size of 0"085 to 

 0'14 mm. in length, and 0*028 mm. in breadth. 



Of three specimens of this sea-pen only one was entii-e, the second wanted the stalk, 

 and the third the end of the raehis. 



Habitat.— Station 241, North Pacific, east of Japan, lat. 35° 41' N., long. 157° 42' 

 E. Depth, 2300 fathoms. Bottom temperature, 1'1° C. Red clay. June 23, 1875. 



2. Scleroj)tilu'm durissiinum, n. sp. 



All smaller branches of the tentacles studded with calcareous corpuscles. 



The Challenger collection contains only one imperfect specimen of this form, which 

 comes very near Scleroptilmn grandiflorimi. The principal differences are the follo-Rdng : — 



a. The polyps are smaller. 



h. The smaller branches of the tentacles possess in their whole length at their aboral 

 side a strong axis or train of needles of '054 mm. in length. 



c. The needles of the sarcosoiiia of the polyps are a little shorter (0*28 mm. in length, 

 0-085 mm. to Oil in breadth). 



d. The needles of the sarcosoma of the raehis are more numerous and longer. 

 Hahitat.— Station 235, North Pacific, south of Yeddo, lat. 30° 7' N., long. 138° 0' E. 



Depth, 564 fathoms. Bottom temperature, 3°-3 C. Mud. June 4, 1875. 



Section II.— RENILLE^. 



Renilla, Lam. 



1. Renilla miilleri, M. Schultze (PI. XL fig. 46). 



The Challenger brought home a great number of this Renilla, of which I give in fig. 



