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ENDEAVOUR" SCIENTIFIC RESULTS. 



II.— DESCRIPTIONS OF NEW OR NOTABLE 

 SPECIES. 



A.— PELECYPODA. 



Pleurodon maorianus, Hedley. 



Pleurodon maorianus, Hedley, Rec. Austr. Mus. , v., 1904, 

 p. S;, fig. 14. 



Numerous examples of this occurred off Cape Wiles in 100 

 fathoms. Some of these were of larger size than those found 

 in New Zealand, being 3 mm. long and 4 mm. high. The 

 species has not been seen previously in Australian waters. 



Chlamvs axtiaustralis, Tate. 

 Pecteti aniiaustralis, Tate, Trans. Roy. Soc. S. Austr., viii., 

 1 886, p. 106, pi. ix., f. 7a-7c ; xxiii., 1899, p. 269; id., 

 Harris, Brit. Mus. Cat. Tert. Moll. Austr., 1897, p. 315. 



Numerous small valves about half an inch in length were 

 dredged in 100 fathoms, forty miles south of Cape Wiles, 

 South Australia. Some are brightly coloured either entire 

 lemon-yellow or irregularly clouded with opaque white and 

 vermilion. Similar specimens were dredged by myself in 100 

 fathoms off Wollongong, New South Wales. Specimens 

 reaching" 100 mm. in diameter were taken plentifullv by Mr. 

 W. L. May and myself in 100 fathoms off Cape Pillar, Tas- 

 mania. We considered the species, ^ as Prof. R. Tate himself 

 had done on first acquaintance, to be a variety of C. asperri- 

 mits, Lamarck. \"alid distinctions pointed out by Prof. Tate 

 between the two species are the concentric lamina? which 

 lattice the intercostal furrows in the young and the multipli- 

 cation of the ribs in the old stages of C. antiaustralis. Com- 

 pared with actual fossils, the recent shell is flatter, but its 

 author expressly notes that C. antiaustralis "exhibits varia- 

 tions in the degree of convexity." Probably this is the shell 

 identified by Gatliff and Gabriel as the young of C. radiatus, 

 Hutton.2 In their reference, to my opinion of the shell, 

 there is some misunderstanding. 



The species has not hitherto been recorded as recent, and 

 this identification adds another sur\i\or from the Tertiary 

 Fauna. 



\'erticordia f.ricia, sp. nov. 

 (Plate xvii., figs, i, 2, 3.) 



Shell small, subcircular, rather solid, apex incurved. 

 Sculpture, about eighteen prominent radiating spiral ribs, 

 which rapidly enlarge with the increase of the shell and pro- 



1 Hedley & May— Rec. Austr. Mus., vii., 1908, p. 113. 



2 Gatliff & Gabriel— Proc. Roy. Soc. Vict., xxiii., 1910, p. 98. 



