84 THE ATLANTIC. [chap. ii. 



temperature observations were taken at the usual intervals to 

 1500 fathoms, and at every ten fathoms for the first sixty. 

 The trawl was fairly successful, several specimens in eacli 

 group, representing the sponges, the Ophiuridea, the Holothu- 

 ridea, the Annelida, the Bryozoa, the Cirripedia, the macrourous 

 Crustacea, the lamellibranchiate and gasteropod Mollusca, and 

 the fishes having been procured — a somewhat unusually varied 

 assemblage from so great a depth. 



On the 24th we had passed the variable boundary, and were 

 in the region of the regular trades, with a steady surface-cur- 

 rent to the north-westward of seventeen miles a day, and we 

 found, on taking a series of temperature observations down to 

 500 fathoms, that the isotherms were again rising. The depth 

 was 2275 fathoms, with a bottom of globigerina ooze. 



On the 25th we sounded in 1850 fathoms, in lat. 1° 47' N., 

 long. 24° 26' W. ; the bottom was again globigerina ooze, and 

 the bottom temperature 1°*8 C. A series of temperature 

 soundino^s were taken at intervals of ten fathoms for the first 

 100, and of 100 fathoms down to 1500. The trawl was put 

 over, and gave us an unusually large number of interesting 

 forms ; among others, many large specimens of a fine species 

 of Limopsis, several brachiopods, a small Umbellularia, several 

 remarkable Bryozoa, several specimens of a species of Archas- 

 ter, some very large examples of a Saleiiia differing apparentl}? 

 in some respects from S. varispina, an entire specimen of a 

 beautiful stalked crinoid which I shall describe under the name 

 of Bathycrinus Aldrichianus^^ and with it some fragments of 



* As the stalked Crinoids are perhaps the most remarkable of all the deep-sea 

 groups, both on account of their extreme rarity and of the special interest of their 

 paleontological relations, I mean to associate the names of those naval officers who 

 have been chiefly concerned in carrying out the sounding, dredging, and trawling op- 

 erations with the new species in this class, whose discovery is due to the patience 

 and ability with which they have performed their task. Lieutenant Pelham Aldrich 

 was first lieutenant of the Challenger during the first two years of her commission ; 

 he is now with Captain Nares as first lieutenant of the Alert. Lieutenant George 

 R. Bethell, I am glad to say, was with us throughout the voyage. 



