10 



THE VOYAGE OF H.M.S. CHALLENGER 



2. Virgularia gracillima, n. sp. (PL III. fig. 11). 



A fragment of a Virgularia may be so named provisionally, as it seems to differ 

 from all known species. 



Pinnules very small, about 0-85 mm. bigb, and 1*1 mm. distant from each other. 



Polyps four on each pinnule, without well-marked cells. 



Eachis small, with a breadth of 0-48 to 0-51 mm. in the middle part, and of 0-62 in 

 the region of the undeveloped pinnules. 



Zooids.— (?) 



Axis round, yellow, 0-42 mm., large in the lowest part of the rachis, with the typical 

 well-developed radiating fibres. Length of the whole fragment 77'5 mm. 



Habitat. — Station 167a, Queen Charlotte Sound, near Long Island, New Zealand. 

 Depth, 10 fathoms. Mud. June 27, 1874. 



Scytaliiim, Herkl. 



1. Scytalium sarsi, Herkl. (PL IV. figs. 14, 15). 



Of this remarkable species, the habitat of which has been hitherto unknown, 

 the Challenger got five more or less well-preserved specimens ; these agree specifically 

 with the only two specimens known, which are preserved in the Leyden Museum. The 

 only remark I have to make is, that the colour of the polypidom, which depends upon 

 calcareous corpuscles of an opac^ue red colour, varies very much. One specimen had 

 the whole rachis uncoloured, and only the polyp-cells and stalk red. In a second the 

 rachis was uncoloured below ; the colour then began at the base of the pinnules on both 

 sides, but more intensely on the ventral side ; and on both faces of the rachis, more on 

 the dorsal side ; at length the whole rachis became red, with the exception of small 

 patches here and there on the ventral border of the leaves. 



The measurements of the three better preserved specimens are — 



Length of the entire polypidom. 



Length of the stalk, . 



Breadth of the stalk, . 



Breadth of the rachis, 



Length of the base of the pinnules. 



Length of the ventral margin of the pinnules, 



Habitat. — Station 212, Philippines, lat. 6° 55 

 and 20 fathoms. Sand. January 30, 1875 



A. 





B. 



c. 



343 mm. 





400 



324 



? 





52 



48 



3 





1-7 



3 



2-7 





1-3 



1-0 



6-8 





4-5 



4-2 



6-8 





4-5-5 



4-0 



5' K, long. 



122° 



15' E. 



Depth, 10, 14 



2. Scytalium tentaculatum, n. sp. (PL III. fig. 12, PL IV. fig. 13). 

 General appearance of Scytalium sarsi, in every part larger, less coloured, with 

 a long simple tentacle at every, polyp-cell. 



