330 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 
8. XyYLoPHAGA GLOBOSA, Sowerby. 
Xylophaga globosa, Sowerby: Proc. Zool. Soc., 1835, p. 110; Thesaurus 
Conch., vol. ii, p. 503, pl. eviii, figs. 101, 102. 
Hab.—V alparaiso, in wood at a depth of sixty fathoms. 
A doubtful species concerning which Mr. Sowerby (Joc. cit. supra) 
observes, ‘‘if there be any real ditference between this and the last 
species, it may consist in the posterior part of the valves in X. dorsalis 
being shorter and more elevated at the dorsal margin. The opening in 
the ventral margin seems also to be more acute in X. dorsalis.” 
‘The species was described from specimens in the Cuming Collection, 
but the shells from that collection now labelled globosa seem to be 
indistinguishable from -X. dorsalis, and even the figures in the 
‘ Thesaurus’’ do not exhibit much difference from the common British 
species. 
4. XytopHaca carpissa, Gould. 
Xylophaga cardissa: Otia Conch., p. 241; Tryon, Proc. Acad. Nat. 
Sci. Philad., 1862, vol. xiv, p. 206. 
Hab.—Mergui Archipelago. 
I have not seen this species, and very much doubt if it really belongs 
to the genus Xylophaga. Gould compared it with X. terediniformis 
and X. aperta, two species which ‘‘ were at first thought to belong to 
the genus Xylophaga, but on examination were found to possess the 
curved processes in the hinge which are characteristic of the genus 
Pholas, and are not found in Xylophaga” (Sowerby). Gould also 
describes the presence of these internal apophyses, thus demonstrating 
that the shells before him did not belong to the genus Xylophaga. On 
the other hand, Tryon,! in his monograph of the Pholadide, observes : 
‘“T owe to Dr. Gould the pleasure of examining specimens of this new 
form of Xylophaga, which is very distinct from the other species of the 
genus.” It is not unlikely that it will prove to be a form, perhaps 
young, of Martesia. 
5. XytopHaca AaByssoruM, Dall. 
Xylophaga abyssorum, Dall: Bull. Mus. Comp. Zool. Harvard Coll., 
vol. xii (1886), p. 317, pl. ix, figs. 7, 7a. 
Hab.—In soft coral nodule off Santa Lucia, West Indies, in 226 fms, 
Another doubtful species, founded on a single specimen only 4 mm. 
in diameter. No accessory plates were observed, and the internal mb 
which is characteristic of the valves of Xylophaga is not referred to. 
Dr. Dall says: ‘‘I am somewhat doubtful whether this shell properly 
belongs in the genus Xylophaga, but it may be immature, and the 
accessory lamin may be later in developing.” 
1 Proc. Acad. Nat. Sci. Philad., vol. xiv (1862), p. 206. 
