54 BULLETIN OF THE 



Understandinc^ that the name Candelabrum, used (but not describeil) for this 

 form (Bull. M. C. Z., Vol. V., 1878), has l)ceii used l)y T51aiuville Inraii oehiiio- 

 denn, I propose to adopt the above designation i'or the group typilial by tlie 

 following species. 



Ancistrosyrinx elegans n. s. 



Canddahrum cathedral if< Dall, /. c. (named, but not (h'scribed). 



Shell with the canal about the same length as tin- spire, acutcdy tapering 

 before and behind ; white ; whorls nine, of which two are embryonic ; ajicr- 

 ture very long and narrow ; anterior surface of the whorls everywhere sculji- 

 tured with even uniform spiral rows of rounded nodules beautifully reticulated 

 l)y the lines of growth ; one row about the middle of the wlioil slightly ele- 

 vated above the others ; carina fringed with delicate triangular points ; ])os- 

 terior surface of the whorls, except for lines of growth, smooth, Avith one row 

 of nodules just inside the carina; canal straight, columella not thickened, but 

 somewhat twisted anteriorly, outer lip sharply angulated by the carina. Length 

 27 mm., of which 12 mm. are behind the carinal notch. Max. width, 12 mm. 

 Width of aperture, 4 mm. Defl. 45°. 



Florida Reefs, Pourtales, 1870. Station 2, 805 fathoms, four miles from 

 Havana, Agassiz, 1877-78. 



This is a most exquisite gem of the sea, and will not fit into any of the sec- 

 tions of Pleurotomidce yet eliminated from the Lamarckian genus. 



SUBGENUS BELA Leach. 



The subdivisions of the Pleurotomidai are at present so indistinctly limited 

 and so poorly defined by diagnosis ; the differences of authors in regard to 

 which groups should be taken as of full generic value are so great, and the diffi- 

 culty of decision in the absence of the soft parts so perplexing ; that for the 

 present purpose I shall regard the groups as merely subdivisions of the La- 

 marckian genus, recognizing of course that some of them, when properly elim- 

 inated, are entitled to generic separation. 



P. (Bela) Blakeana n. s. 

 Shell very variable in proportions and somewliat variable in sculpture ; thin, 

 white, with a dark nucleus, rather acute spire, short pillar and rather wide 

 aperture ; sculpture of revolving threads, two stronger ones immediately in 

 front of the suture, which are nodulated at their intersection with the ribs ; 

 with sixteen to eighteen transverse ribs which are strongest near the suture 

 and fade away toward the canal ; notch subobsolete ; shell with the waxy pol- 

 ish characteristic of so many abyssal forms. 



Yar. normalis. 



Shell short and very stout, seven-wliorled, the last whorl about eight elev- 

 enths of the whole length ; extreme nucleus smootli ; remainder of the three and 



