216 



Vincent Gulf: Tate, Trans. Roy. Soc, South Australia, 1887, vol. 

 ix., p. 102, No 125; Tate and May, Proc. Linn. Soc, N.S. Wales, 

 1901. vol. xxvi., part 3, p. 43o. ''Tasmania" ; Pritchard and Gat- 

 liff, Proc. Roy. Soc, Vict., 1904, vol. xvii. (N.S.), part 1, p. 237, 

 ''Victoria." 



Locality. — Taken on the beach at MacDonnell, Rivoli, 

 and Guichen Bays ; many dredged alive in 5 fathoms, St. 

 Vincent Gulf, and in 20 fathoms Backstairs Passage; valves 

 dredged in Spencer Gulf, and also in 40 and 150 fathoms off 

 Beachport, and one valve in 130 fathoms off Cape Jaffa. 



Nucuia beachportensis, ^i>. iiqc. PI. xxvii., tig. 3. 



Oval-trigonal, moderately solid. Umbos prominent, in- 

 flated, slightly opisthogyre, incurved. Teeth about thirteen 

 anterior, solid and curved ; six posterior. Fossa for the inter- 

 nal cartilage rather small, directed forwards and inv^^ards. 

 Dorsal border very slightly excavate just behind the fossa, 

 then convex, then straight to the posterior inferior angle ; 

 ventral border with a uniform curve, joining with a smaller 

 curve the ante-rior dorsal border, which has a very slight 

 convex arcuation, and is about twice as long as the posterior. 

 Inner ventral margin minutely crenulate. 



SculjHure. — Smooth, but for obsolete rounded concen- 

 tric strias at irregular distances, and scanty microscopic 

 radial strice. 



Dimensions. — Umbo-ventral, 4'6 mm.; antero-posterior, 

 4-9 mm. 



Locality. — Dredged off Beachport, 40 fathoms, 1 perfect 

 (type), 2 valves; in 100 fathoms, 1; 150 fathoms, 2; 200 

 fathoms, 1 ; off Cape Jaft'a in 130 fathoms, 1 ; 300 fathoms, 

 6; all dead. 



Diagnosis. — It is very like N. micans, Angas, but is a 

 larger shell, is smoother, is not so uniformly rounded behind, 

 bub is truncated or straight from the end of the hinge to the 

 ventra] border, and the crenulations are fewer and more valid. 



Nucuia obliqua, Lamarck. 

 Nucuia ohiiqua, Ijamarck. Anim. s. Vert., 1819, vol. vi., p. 

 59; Chenu, Man. Conch., vol. ii., 1862, p. 179, f. 897: Hedlev, 

 Mem. Austr. Mus., 1902, iv., p. 292. N. tumida, Ten. Woods. 

 Proc. Roy. Soc. Tasm., 1877 (1876), p. Ill (non Phillips, Illus. 

 Geol. Yorkshire, 1836, part 2, pi. v., f. 15; nee Hinds, Proc. Zool. 

 Soc, Lond., 1843, p. 98). Tvpe locality, Eocene fossil. Table 

 Cape, Tasm. N. tenisoni, Pritchard, Proc. Roy. Soc. Vict., 1896, 

 vol. viii., p. 128. 



Dredged off Cape Jaffa, in 90 fathoms, 1 valve ; in 130 

 fathoms, 16 valves; in 300 fathoms, 1 alive, small, and 3 

 valves; off Beachport, in 110 fathoms, 34 valves; in 150 fat- 

 homs, 19 valves; in 200 fathoms, 24 valves. 



