424 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



Saxicavidae. 



SAXICAVA Fleuriau de Bellevue. 



Saxicava antarctica Philippi. 



Saxicava antarctica Pliilippi, Arch. f. Naturg. 1845, p. 51; E. A. Smith, P. Z. S. 



Lond., 1881, p. 40; Mabille et Eochebrune, Miss. Cap Horn, Zool, 1889 



Moll., 6, p. H 102. 

 Saxicava chilensis Hupe, in Gay, Hist, de Chile, ZooL, 1854, Moll., 8, p. 379, pi. 8, 



fig. 7. 

 Saxicava frigida Mabille et Kochebrune, Miss. Cap Horn, Zool., 1889, 6, p. H 101. 

 Saxicava iebnini Mabille et Rochebrune, op. cit., p. H 101. 

 Saxicava mollis Mabille et Rochebrune, op. cit., p. H 102. 



U. S. S. "Albatross," station 2780, Straits of Magellan, in 369 fathoms, mud, 

 bottom temperature 47° F. U. S. N. Mus. 96,248. Chonos Id., Philippi; Straits 

 of Magellan at Punta Arenas, and Orange Harbor, New Year Sound and Cape 

 Horn, Mabille; Calbuco, Chile, Hupe. 



The genuine and unmistakable Saxicava arctiea is found at Cape Delgado and 

 Spiring Bay, in Eastern Patagonia, by the evidence of the " Albatross " dredgings. 

 There would therefore be nothing improbable in the extension of its range to the 

 straits and even northward on the otlier, western coast. I have seen only young 

 specimens, and so can hardly express an opinion as to the validity of Phihppi's 

 species, since the similarity of the young is common to many distinct species. I 

 agree with Mr. E. A. Smith in thinking them undistinguishable so far as any ma- 

 terial I have seen furnishes evidence. Messrs. Mabille and Rochebrune give no 

 evidence for the validity of their nominally new species. Their diagnoses are 

 without differential or any otiier characters of consequence, and no figures are 

 furnished. Their species cannot be said to be adequately or recognizably de- 

 scribed ; I have no doubt of their identity with S- antarctica and very little of 

 the identity of that so-called species with Saxicava arctiea (+ rugosd) of the 

 northern hemisphere. 



Adesmacea. 



Pholadidae. 



PHOLADINAE. 



XYI.OPIIAGA TuRTON. 



Xylo})haga Turton, Dithyra Brit., 1822, p. 527; type, X. dorsalis Turton ; not Xylo- 



phagus Meuschcn, 1788. 

 Xytotomea Dall, Trans. Wagner Inst., 1898, 3, p. 821. 



If the name Xylopliagjx be rejected on account of the existence of the ancient 

 synonym Xylophagus, a practise wliich the writer emphatically disapproves, the 

 name Xylotomea may take its place as above indicated. 



