CHAP. I.] 



BERMUDAS TO MABEIBA. 



55 



Fig. 14. — Ceratotrochus nobilis, Moseley. 

 Slightly enlarged. (No. 78.) 



scribed under this head by Milne-Edwards in that it has five 



cycles, the fifth being incom- 

 plete, and in other particulars 

 which appear from the descrip- 



tion given. 



A single living specimen of a 

 coral, referred by Mr. Moseley 

 to the genus Ceratotrochus (Fig, 

 14), was obtained from this haul. 

 The corallum is white, the base 

 subpedicellate, with a small scar 

 of original adherence. The prin- 

 cipal costffi are prominent, and 

 round the region of the base they are beset with small spines 

 directed somewhat upward. The upper portion of the costa is 

 without spines. The primary and secondary septa are broad 

 and exsert. Pali are absent ; the columella is fascicular. The 

 absence of pali, the form of the columella, and the nature of 

 the base associate this form with the CeratotrocJd as defined by 

 Milne-Edwards. 



The animal is of a dark madder color on the region of the 

 margin of the calicle between the exsert primary and secondary 

 septa, and on the membrane investing the wall of the corallum 

 from the margin down to the commencement of the spines. 

 This dark color is succeeded on the disk by a band of pale blue, 

 within which there is again a zone of very dark madder color 

 round the mouth. The dark coloring-matter is interesting, as 

 it gives an absorption spectrum of three distinct bands. 



On Friday, July 11th, we sounded in 2025 fathoms, 376 miles 

 to the west of Madeira, the bottom very well marked globigerina 

 ooze, and the bottom temperature 1°*5 C. 



On the following day the depth was 2260 fathoms, the bot- 

 tom globigerina ooze, and the recorded bottom temperature 

 1°"8 C. ; and on the 13tli the depth was 2675 fathoms, with the 



