SUPPLEMENT. ' 175 



was referred by M'' Andrew and Barrett to Pectunculas 

 pygmcPALS of Philippi, and by Sars to his P. minutus. But 

 the last named species (of which L. pygmcza is probably 

 the younger state or a variety) is very much smaller than L. 

 borealis, although stronger and more solid ; it has a less ob- 

 lique outlhie, more numerous strise (which present the same 

 beaded or granulated appearance as in L. aurita), and fewer 

 teeth ; and the inside edge is closely crenellated, instead of 

 having a row of tubercles placed within the edge, which is 

 plain and sharp. L. abyssicola of A. Adams, from 136 f. off 

 the Cape of Good Hope, is allied to the present species, 

 but is more closely cancellated, and the marginal notches 

 are finer and more numerous. I have a small living speci- 

 men of L. pygmcea from Corsica. 



P. 165, 1. 4 from top, " beaks " should be in italics. 



P. 166. — Pectu:kctjlus glycyhebis. N. of Hebr., 189 f. 

 (C. and T.). 



Var. globosa. Shell smaller, and more tumid ; colour of a 

 deeper brown and nearly uniform ; cardinal area or space 

 below the beak in each valve denticulated. Guernsey. E. 

 Algeria (Weinkauff) ! 



P. 169. — Area pilosa of Linne is not our species, but a 

 much larger and heavier shell. 



P. 171. A. PECTLTJCT7LOIDE8. 



Mantle plain-edged : tubes pale yellowish -brown, irregularly 

 speckled at the extremities with flake-white : foot white : liver 

 bright orange. 



Orkneys (Thomas) !; N. of Hebr., 170-650 f. (C. and T.). 

 F. Postglacial deposits in Norway. Nyst's specimens, from 

 the " sable noir," have a notched margin, and probably belong 

 to a different species. E. LofFoden I., 300 f. (Sars) ; Gulf of 

 Naples, 60 f. (Acton and Stefanis) ! 



P. 173, 1. 10 from top, for " Pomatoceros arietinus''' r. " Di- 

 trypa arietina ". 



P. 175. — A. obliqua. N. of Hebr., 1S9 f . ; a single valve 

 (C. and T.). F. Sicily (Seguenza) ! E. Corsica (Susini) ! ; 

 Naples (Stefanis) ! 



P. 177.— A. lactea. F. Macclesfield, 500-600 ft. (Dar- 



