208 



prickly, and at the other with only small uniform crowded 

 ribs. Later, these were found to be on the one hand more 

 prickly and costate than specimens of P. aculeata, from New 

 South Wales, and on the other to be identical with F. hepa- 

 tica, from Victoria. I feel confident that a larsfer series will 

 unite these three as conspecific, and they will be called F 

 ■astulata, Reeve. 



Patella chapmani, Ten .-Woods. 



Patella cliapmani^ Ten.-Wo-odis, Proc. Rov. Soc., Tasm., l^l^S 

 for 1875, p. 157; Pilsbrv., in Trvon, Man"! Conch., 1891, vol. 

 xiii., p. 101; Pritchard and GatHff, Proc. Roy. Soc, Vict., 190.3 

 vol. XV. (n. s.), p. 193; Tate and May, Proc. Linn. Soc, 1901, vol. 

 xxvi., p. 410. 



AoiKxa alha, Ten. -Woods, Proc. Rov. Soc, Tasm., 1877 for 

 1876, pp. 155, 156; Pilsbry., 1891, op. clt., p. 54, pi. xlii., figs. 

 76-78; Tate and May, loc. cit.; Pritchard and Gatliff, loc. cit 



Tate and May, loc. cit., identify it with P. steUaeformis, 

 Rve., Conch. Icon., f. 48. It is rare in S. Aust., but has been 

 taken at Port MacDonnell (AV. T. Bednall) and at Royston Head, 

 Yorke Peninsula. 



Genus Nacella, Schumacher. 



Nacella parva, Angas. 



Nacella parva, Angas, Proc Zool. Soc, 1878, pi. liv., f. 12; 

 '^Hab., Holdfast Bay and Aldinga Bav ; parasitic on seaweed ;" 

 Adoock, Handlist of Aquatic Moll. 1893, p. 9, No. 393. It has 

 been found as far east as Aldinga Bay, and as far west 

 as Fowler's Bay. It appears to be of limited habitat, for Pritchai-d 

 and Gatliff do not record it m their Victorian catalogue, nor 

 Tate and May in their Tasmanian Census. I have not seen it 

 f rom W . Australia. 



Nacella compressa, spec. nov. PI. viii., figs. 11, 12. 



Shell narrowly elongate, elliptical : sides straight, par- 

 allel ; ends round. Apex overhangs one end (which is con- 

 cave vertically, and slightly narrower than the other), barely 

 oblique slightly to the left of the midline. Dorsum convex^ 

 rising higher than the nucleus. Sides nearly vertical ; base 

 flat, margin simple. Concentric growth lines, and micro- 

 scopic radial scratchings. 



Dim. — Length, 5 mm.; breadth, 1*6 mm.; height, 1*25 

 mm. 



Locality. — Investigator Strait, 15 fathoms, 6 dead. 



Diagnosis. — Its shape separates it from N . parva, Angas, 

 which measures 5'6 mm. by 2*8, and is therefore twice as wide 

 for the same length. It may be only a variant of this species, 

 cramped by residence on \ery narrow zostera or other growth. 



Nacella crebristriata, Verco. 



Trans. Roy. Soc, S. Aust., 1904. vol. xxviii., p. 144, pi. xxvi. 

 figs. 20, 2L .IP. 



