424 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Saxicavidae. 
SAXICAVA FLEURIAU DE BELLEVUE. 
Saxicava antarctica Puit. 
Saxicava antarctica Philippi, Arch. f. Naturg. 1845, p. 51; E. A. Smith, P. Z. S. 
Lond., 1881, p. 40; Mabille et Rochebrune, Miss. Cap Horn, Zool., 1889 
Moll., 6, p. H 102. 
Saxicava chilensis Hupé, in Gay, Hist. de Chile, Zool., 1854, Moll., 8, p. 379, pl. 8, 
fig. 7. 
Saxicava frigida Mabille et Rochebrune, Miss. Cap Horn, Zool., 1889, 6, p. H 101. 
Saxicava lebruni Mabille et Rochebrune, op. cit., p. H 101. 
Saxicava mollis Mabille et Rochebrune, op. cit., p. H 109, 
U. S. 8. “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, Hupé. 
The genuine and unmistakable Sazicava arctica 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 other, western coast. I have seen only young 
specimens, and so can hardly express an opinion as to the validity of Philippi’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 other 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 9. antarctica and very little of 
the identity of that so-called species with Saxicava arctica (+ rugosa) of the 
northern hemisphere. 
Adesmacea. 
Pholadidae. 
PHOLADINAE, 
XYLOPMAGA Turron, 
Xylophaga Turton, Dithyra Brit., 1822, p. 527 ; type, X. dorsalis Turton; not Xylo- 
phagus Meuschen, 1788. 
Xylotomea Dall, Trans. Wagner Inst., 1898, 3, p. 821. 
If the name Xylophaga be rejected on account of the existence of the ancient 
synonym Xylophagus, a practise which the writer emphatically disapproves, the 
name Xylotomea may take its place as above indicated. 
