THE VOYAGE OF H.M.S. CHALLENGED. 



specimen of this Pennatula was evidently beset with small pinnules, of which remnants' 

 were still visible ; the exact number of these could not, however, be determined, therefore 

 the number of twenty-one to twenty-two is only apjDroximate. 



The stem has an enlargement at the ujDper end, the upper part of which is of the 

 same sulphur- colour as the rachis, while the lower portion is colourless like the rest of 

 the stem. This lower part diminishes in size till near the end, Avhere there is a small 

 swelling or bulb covered with minute papillae only visible under the microscope. 



The whole feather, with the exception only of the polyps, is furnished with a large 

 number of yellow and red calcareous needles of the form common in the Pennatulidse. 

 Yellow needles are also found in the stem where it is coloured yellow. The lower 

 part of the stalk is destitute of calcareous bodies with the exception of the end-bulb, 

 which contains very small round and oblong calcareous corpuscles. 



The only polypidom at my disposal was of female sex, and the eggs were situated in 

 the pinnules. 



Length of tlip, whole polypidom, 



Length of the whole stalk, . 



Length of the whole feather. 



Length of the longest pinnules, 



Ereadth of the p)innules at the base, 



Breadth of the upper enlargement of the stem. 



Maximum length of the yellow needles, 



Maximum breadth. 



Maximum length of the red needles, 



Breadth of the red needles, . 



Calcareous bodies of lower bulb of stalk, 



140 mm. 



40 



100 



17 



53 



3-30 



1-28 



0-085 



0-85 



0-041 



0-007-0-011 



Habitat. — Station 192, on the south-east of Ceram, west of New Guinea, lat. 5° 42' 

 S., long. 132° 25' E. Depth, 129 fathoms. Mud. September 26, 1874. 



4. Pennatula moseleyi, n. sp. (PL II. figs. 8, 9). 



The Challenger collection contained only one specimen of this remarkable species, 

 consisting of a fragment of the pen 138 mm. in length ; but this fragment showed 

 characters sufficiently marked to cause it to be recognised as a good species. Polypidom 

 large, intensely red. Pinnules thick, not transparent, crowded, triangular and lanceolate, 

 curved at their free end, and with thirty to thirty-four polyps in two or three rows on 

 their border. Polyp-cells with spines. Zooids of two kinds, the ventral beginning at the 

 border of the leaves, large and spiny, the lateral small. 



Pinnules twenty-six in number on each side of the fragment, of which the upper end 

 is wanting. Form of the pinnules nearly triangular or lanceolate. Their broad basis 

 obliquely attached to the rachis, the polypiferous dorsal border convex and much longer 

 than the concave ventral margin, so that the free end of each pinnule is curved like a hook. 



