REPORT ON THE GASTEROPODA. 25 



Sub-class GASTEROPODA, Cuvier, 1 1798. 

 Order PROSOBRANCHIA, Milne-Edwards, 1848. 



Family Lepetid^e, Gray, 1850. 



Genus Lepeta, Gray, 1842. 



Species. 



1. Lepeta cmca (Miiller). 2. Lepeta (Pilidium). 2 fulva (Miiller). 



1. Lepeta cceca (Miiller). 



Patella caeca, Miiller, Zool. Dan. Prodr. (1776), p. 237, No. 2866. 

 Lepeta caca, Jeffreys, Brit. Conch., voL iii. p. 252, vol. v. pi. lviii. fig. 6. 

 „ „ Gould, Inverteb. Massachusetts (Binney), p. 270, f. 531. 

 „ ,, Jeffreys, Moll. Europe and Eastern North America, Ann. and Mag. Nat. Hist., ser. 4, 



vol. x. 1872, p. 242. 

 ,, ,, Jeffreys, "Valorous" Moll., Ann. and Mag. Nat. Hist., ser. 4, vol. xix. 1877, p. 231. 



„ G. 0. Sars, MolL Reg. Arct. Norv., p. 123, pi. xx. fig. 17. 

 „ „ Dall, Alaska Explor., U.S. Nat. Hist. Mus. Report, vol. i. 1879, p. 116. 



Station 24. March 25, 1873. Lat. 18° 38' 30" N., long. 65° 5' 30" W. Culebra 

 Island, West Indies. 390 fathoms. Pteropod ooze. 



Habitat. — From Shetland northwards to the Sea of Okhotsk and to Japan on the E., 

 and to the Atlantic and Pacific Coasts of America on the "W. A true Arctic form, 

 found in from 10 to 690 fathoms (Sars and Jeffreys). 



Fossil in older and younger Post-pliocene beds of Norway and Sweden, and in the red 

 and coralline crags of England (Jeffreys). 



In regard to this species it may be well to observe that the short slope of the shell is the front, 

 as is the case with all the unfissured patelliform shells, except Propilidium, the Umbrollida?, and the 

 Siphonariida?. The presence in the young of a one-whorled spiral incurved deciduous apex seems 

 fully confirmed (see Jeffr. " Valorous " Dredgings, loc. cit. supra). 



1 The alteration of Cuvier's word to Gastropoda, which has found some acceptance, could only have been 

 justified had he been wrong in his spelling, which he is not. Between the two forms of the Greek root in 

 composition, surely Cuvier was free to choose which he pleased, even though he preferred the less common 

 one. 



2 Forbes, Athenaeum, Oct. 6, 1849, p. 1018; not of Middendorff, Sib. Reise, p. 214, 1851 (see Dall, Mon. 

 Fam. Lepetidas, Amer. Journ. Conch., vol. v. 1869, p. 146). 



(ZOOL. CHALL. EXP. — PART XLII. — 1885.) Tt 4 



