BUCCINIDJE. 273 



Habitat : Shetland, 8.2-86 f., in fine muddy sand 

 (J. G. J.); very rare. Fossil on the Turbotbank, near 

 Larne, 20-25 f. (Hyndman, Waller, and J. G. J.); 

 Boulder-clay, Wick (Peach); Uddevalla (J. G. J.). 

 Living in Upper Norway (M' Andrew and Barrett, as 

 Chemnitzia e/^«w/mmz«,Loven,Danielssen, and Malm); 

 Vaderoarne in South Sweden, 80-100 f. (Malm, as Ceri- 

 thium metula, var.) ; Iceland (Torell) ; Greenland (M61- 

 ler), and in 65 f. (B.o\hb\\,fide Morch) ; long. 54° 33' W., 

 lat. 55° 36' N. in 1622 f., from which extraordinary 

 depth a fragment was procured by means of the ' Bulldog 7 

 sounding-machine (Wallich) . 



Morch changed the name given by the discoverer to 

 Cerithium arcticum, because the latter had described the 

 shell as Turritella^ costulata, it not being Lamarck's 

 nor Risso's so-called species. But the present species 

 is not a Turritella (as, indeed, Moller suspected) ; and 

 the reason assigned by Morch is, therefore, insufficient. 

 I described the fossil shell as Cerithiopsis nivea, and 

 S. P. Woodward proposed to name the recent one Ceri- 

 thium Naiadis. 



Family XXVII. BUCCTNIDjE, Fleming. 



Body spiral, short: mantle large, forming a head-veil in front, 

 plain-edged : pattial tube cylindrical, protruded beyond the 

 canal of the shell : head small, wedge-shaped : proboscis re- 

 tractile, long, and cylindrical: tentacles conical or triangular, 

 separated by the head- veil : eyes placed outside, some way up 

 the tentacles : foot short : opercular lobe roundish-oval and 

 simple : gills forming two long unequal-sized plumes : odonto- 

 phore long and straight ; central tooth armed below and on 

 each side with spines or crested points, squeezed and bent 

 backwards above ; lateral teeth small and separate, each ending 

 in a hook. Sexes separate ; verge falciform. 



n 5 



