219 



exceedingly wide; posterior dorsal margin straight. Posterior valve as the 

 others, and with prominent, central, obtuse, elevated apex, the slope to the margin 

 being slightly concave. Bednall. Length, 9 mm. ; breadth, 35 mm. Hab., St. 

 Vincent Gulf." 



Note. — The description should have the words "and pleural" inserted, then 

 reading, "The granulations running longitudinally on the dorsal and pleural 

 areas." The body of this species is nearly always bright pink or red, but some- 

 times practically black. The shell varies from grey to rufous or dark brown. 



Lepidopleurus columnarius, Hedley and May, 1908. 



PI. xvi., figs. 3, 3 a, b. 



(Hedley and May, Rec. Austr. Mus., vol. vii.. No. 2, p. 123, pi. xxiv., figs. 27, 28; 

 May and Torr, Papers and Proc. Roy. Soc. Tas., p. 28, 1912:=!,. pelagicus of Torr, Trans. 

 Roy. Soc. S. Austr., vol. xxxvi., pp. 165, 166, pi. 5, figs. 2 a-f, 1912; Gatliff and Gabriel, 

 Proc. Roy. Soc. Vict., vol. xxvi. (N.S.), p. 78, 1913.) 



Original description: — "Valves round-backed, greatly arched, lateral areas 

 inclined to the rest of the valve. Posterior valve with full rounded umbo. 

 Girdle with minute, dense, imbricating scales. Colour uniform waxen. Sculpture ; 

 minute grains strung in longitudinal, radiating rows, parted by deep grooves of 

 equal width. Going forward from the mucro additional rows are intercalated. 

 The pleural and jugal areas together have about 50 rows. The lateral areas are 

 differentiated by densely packed, less prominent, and disarranged grains. Length 

 of single curled and shrivelled specimen, about 8 mm. ; breadth, 3 mm." 



To the above description I would add, from an examination of the Port 

 Arthur specimen : — "Valves carinated as well as very greatly arched ; lateral 

 areas beset with radiating rows of closely-packed granules (about 20 rows in 

 specimen before me) ; the posterior margin is deeply toothed, the separating 

 grooves being diagonally turned upwards. The girdle, in addition to the scales, 

 is furnished with slender, white spicules. For further details see notes under 

 L. pelagicus, Torr. Hab. — The type with two valves was dredged by Mr. W. 

 L. May in 100 fathoms, seven miles east of Cape Pillar, Northern Tasmania. 

 The same gentleman dredged several valves in 80 fathoms off Schouten Island. 



One almost complete specimen, girdle damaged, dredged in 70 fathoms, 

 off Port Arthur ; dredged in Bass Strait by Trawler "Endeavour" ; dredged 

 by Sir Joseph Verco, in 130 fathoms, off Cape Jaffa; and several valves, off 

 the south-east coast of South Australia, in 300 fathoms. 



From the foregoing records it will be seen that this species is essentially 

 a very deep-water form, being found in varying depths from 420 feet to 

 1,800 feet. 



Lepidopleurus badius, Hedley and Hull, 1909. 



(Hedley and Hull, Rec. Austr. Mus., vol. vii.. No. 4, p. 260, pi. 7i, figs. 1. 2, 1909; 

 Ashby, Trans. Roy. Soc. S. Austr., vol. xliv., 1920, p. 283.) 



Original description: — "Shell small, broad in proportion to length, rather 

 low, rounded dorsally. Sculpture uniformly grain-striate. Colour entirely 

 ochraceous, the valve margin sometimes rust. Anterior valve densely radially 

 grained. Median valves narrow with a straight, posterior edge ; central and 

 jugal areas confluent, lateral areas indistinctly indicated by a slight fold. About 

 50 grain-rows to a valve, medially about a dozen grains are close set in a row, 

 but wider apart from row to row, the rows longitudinal in the middle, con- 

 verging at the sides, and losing their regularity on the lateral areas. Posterior 

 valve with central, elevated apex and concave, posterior slope. Girdle beset 

 with small chaffy scales, fringed with spicules. Interior white, sutural plates 

 rounded, jugal sinus very broad and shallow. Insertion plates entirely absent. 

 Length, 6 mm. ; breadth, 3 5 mm. The body of the animal is a deep-red colour." 



