EEPORT ON THE PENNATTJLIDA. 31 



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



poinds. 



The rachis is cylindiical, with very httle sarcosoma. 



The axis is round, and measures in the lower part of the rachis 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 foimd in 

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

 itself the needles are shorter and more slender, and. go down to a si^e 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 entire, the second wanted the stalk, 

 and the thiixl the end of the rachis. 



A. B. C. 



Length of the wliole polypidom, . . . 100 mm. 



Length of the rachis, 

 Length of the stalk. 

 Upper swelling of stalk, 



Upper swelling of end-hulh, 



62 140 



38 ... 51-5 



17 ... 2'0 



1-3 ... 2-5 



Habitat.— 8Ution 241, North Pacific, east of Japan, lat. 35° 41' N., long. 157° 42' 

 E. Depth, 2300 fathoms. Bottom temperature, 1-1° C. Eed clay. June 23, 1875. 



2. Scleroptilum durissimum, n. sjD. 



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 Scleroptilum grandiflorum. The principal dijfferences are the following :— 



a. The pol}'ps are smaller. 



h. The smaller branches of the tentacles possess in thcii- whole length at theii- aboral 

 side a strong axis or train of needles of 0-054 mm. in length. 



c. The needles of the sarcosoma of the polyps are a little shorter (0-28 mm. iu length, 

 0-085 mm. to O'll in breadth). 



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

 i7a&{<o^.— 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^. 



Eenilla, Lam. 



1. Renilla miilleri, M. Schultze (PL XL hg. 4G). 



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



