NARRATIVE OF THE CRUISE. 



197 



red fragments of Balanoglossns, which show that the whole animal must have been of 

 great length, at least 6 inches. 



"Again, at Station 147, 30th December 1873, 1G00 fathoms, large reddish fragments 

 of a Balanoglossns were also brought up, in one of which the collar was preserved. 

 Apparently these latter specimens belong to the same species, the head of which was 

 obtained in the deep sea in the tropics. The whole animal must have had a length 

 of from 3 to 5 inches, and have measured nearly fths inch across the body." 



The above extracts from Dr. v. Suhm's 

 Journal, being of considerable interest as the 

 only record which has been preserved of these 

 deep-sea specimens, are inserted here, although 

 since it was written great additions have been 

 made to the knowledge of the structure and 

 development of Balanoglossns, and the animal 

 has assumed an importance which has rendered 

 it familiar to all students of animal morphology. 



The Echinoidea. — At 1850 fathoms there 

 were two fine specimens of a new species of 

 Salenia, described under the name of Salenia 

 hastigera (see fig. 74) by Mr. Alexander Agassiz, 

 who gives the following notes on the Echinoidea 

 collected by the Expedition. " The importance of 

 the additions made to our knowledge of the Echini 

 by the Challenger collection is well shown from 

 the fact that at the time Mr. Agassiz wrote his 

 Report 1 the hauls of the Challenger presented no 

 less than forty-nine new species out of a total of 

 297 known species. Although no new families 

 were added to those discovered by the earlier 

 expeditions of the U.S. Coast Survey, of the 

 Swedes, and of the English, yet the number of 

 new genera and species added to the lists were 

 of the greatest importance in elucidating the 

 affinities of a number of recent and fossil forms. 



" The number of new Cidaridae was not great, 

 but the dredging of a new Porocidaris, with its curved actinal spines and its long, smooth, 



Fig. 80.— Salenia varispina, A. Ag. ; four timet 

 the natural size. 



1 Report on the Echinoidea of the Challenger Expedition, by Alexander Agassiz, Zool. Chall. Exp., part ix., 



1881. 



