Gatty Marine Laboratory, St. Andrews. 55 



The ceplialic region dorsally has a wide collar wliich 

 passed inward and forward in the median furrow to which it 

 was attached. Thus the collar participated in the groove 

 and thinned off at its anterior end. Moreover, the frilled 

 edge passed backward to the anterior border of the second 

 bristled segment^ and, forming a V, conrsed forward again 

 to join the lateral rim of the collar. The edges of the V 

 were free, and thus greatly contributed to the extension of 

 the collar. Laterally the collar was apparently unbroken, 

 and continued to the large ventral recurved lappets which 

 were fixed at their inner edge to the cephalic plate, the free 

 lamella on each side covering much of the first scute. From 

 the inner edge of each lappet a conspicuous membrane 

 stretched forward to be attached to the edge of the branchial 

 fan, thus extending about a fourth of the total length of 

 the branchiae. The basal region of this peculiar web was 

 expanded into a wide disk or lamella, the edges of which 

 were more or less curved (PI. I. figs. 1 & 2), so that from 

 the ventral surface a large semicircular plate flanked the 

 vertical ridge at each side. The function of this remark- 

 able apparatus was probably connected with alimentation 

 in its abyssal habitat, an unusually powerful and extensive 

 current being thus directed forward between the lamellae 

 to the region of the mouth. The whole arrangement of 

 the collar is, so far as known, unique, and carries further 

 the condition indicated by those of Chone duneri and to a 

 less degree by those of C. infundibulifurmis. In front of 

 the groove with the fixed anterior folds of the collar, the 

 branchiae dorsally presented a solid base, whereas ventrally 

 a wide groove ran forward between the fans, and over the 

 mouth lay a mass of debris rich in Foramiuifera, fragments 

 of Echinoderms, and other organic structures. The anterior 

 edge of the ventral membranous ridge was fixed to the base 

 of the lower edge of the branchial fan of its side, and to 

 this were attached five or six short and slender branchial 

 filaments, the rest being much larger, the total number 

 being about fifteen in each fan. The branchial filaments 

 were softened and injured, but they seemed to have the 

 normal structure, only a single filament having a tip more 



(to be iuitiated into the preservation of marine animals) to his successful 

 conclusion of the 'Challenger' publications, has been watched with 

 interest. Sir Wyville then thought he would attend to the preservation 

 of the contents of the dredges and trawls as well as to the skins of birds. 

 He afterwards had much work with the tow-nets, and was anxious to 

 describe the Radiolurians, but these went to Prof, Haeckel. To Sir John 

 was assigned the bottom-deposits. 



