74 BULLETIN OF THE 



Station 2, 805 fins. Off Cape San Antonio, 1,002 fms. Station 5, 229 and 

 152 fnis. 



Notwithstanding \ho. differences above indicated by extreme specimens, the 

 shells appear to grade into one another and to approach very closely the old 

 M. avena of Valenciennes, of which indeed this may be but an abyssal race ; 

 but of the latter I have no typical specimens, and it is described as having 

 color bands. In view of the great number of the closely allied forms of this 

 group, without such specimens it would be rash to consolidate. 



Another form with the spire almost lost (from Yucatan Strait, 640 fms., and 

 Station 2, 805 fms), of a yellowish white tinge, strongly resembles D'Or- 

 bigny's M. triplicata, which I take to have been founded on an abnormal 

 specimen, and might be thought a pale race of Volvarina varia, but I am not 

 at all sure that it is not an extreme form of the preceding. The genus Vol- 

 varina, unless supported by other than its conchological characters, must be 

 given up, if the above inferences be supported by further investigation. 



GENUS PUNCTURELLA Lowe. 



Type Patella noachina L. 



= Patella sp. L., Mantissa, p. 551, 1771 ; 0. Fabr., Faun. Gronl., p. 384, 1780 ; etc. 



< Cemoria Leach, MS., 1819 ; Lowe, Zool. Journ., IIL p. 77, passim, 1827. 



not Diodora Gray, Lond. Med. Rep., XV. p. 233, Mar., 1821 (no diagn.). (:=Fissu- 



rella sp. juv.) 

 not Cemoria Risso, Hist., IV. p. 258, 1826. (=Cahjpt,rma Lam.) 

 = Diadora "Gray," Blainville, Man., I. p. 501, jmssijn (in error), 1825 (no diag.). 

 = Puncturclla Lowe, Zool. Journ., III. p. 78, Jan., 1827 (P. noachina). 

 <Sipho Brown, IIL Conch. Gt. Brit. (ed. prima), pi. 36, fig. 14-16, 1827 (S. 

 striatus Br. = P. noachina Lowe). Id. Conch. Textb., 1833, p. 100, sole ex. S. 

 striatits, PL XIV. fig. 21 ; do. (ed. Macgillivray n. d.), ed. VI. p. 115, PL 

 XIV. fig. 21, same type. (Not Sij^ho, Klein, Fabr., nor Morch.) 

 Fissurella sp. Lyell, Phil. Trans., 1835, p. 37 ; and most older authors. 

 Biodora Gmj, Syn. Brit. Mus., 1840, name only. 



Rimula sp. Coutnouy, Bost. Journ. Nat. Hist., 11. p. 87, 1838 ; Loven, Ind. MolL 

 Scand.,,p. 21, 1846. (Not of Defrance.) 

 = Cemoria Moller, Index, p. 16, 1842 ; Migh. & Ad., Bost. Journ. Nat. Hist., 

 1842, p. 42 ; Gray, Ann. Nat. Hist., XX., 1847 (name only). 

 ? Si2->hon " Brown, 1844," Gray, P. Z. S., 1847, p. 147 (not of Brown). 



< Sypho " Brown, 1827 " Gray, P. Z. S., 1847, p. 147 ; Philii.pi, Handh., p. 217, 



1853; Forbes & Hanley, Brit. Moll., II. p. 473, 1853. (Not of Brown.) 



< Ccvioria Leach, Moll. Gt. Brit., p. 213, Dec, 1852. (Here for the first time pub- 



lished according to the rules of nomenclature. ) 



= PuncturcUa (Lowe) Forbes & Hanley, Brit. Moll., II. p. 473, 1853; Woodward, 

 Man. Moll., p. 150, 1853 ; Gray, Guide Brit. Mus., p. 164, Jan., 1857 ; Jef- 

 freys, Brit. Conch., III. 256, 1865. 



= Cemoria H. & A. Adams, Gen. Rec. Moll., I. p. 450, 1854 ; Chenu, Man. Con- 

 chy!., I. p. 372, 1859. 



