22i 



the pit are nearly vertical and laminar, and rather close to- 

 gether ; especially the first two ; the posterior three become 

 gradually more distant, stouter especially at their outer 

 ends, shorter, and more diverging, lying perpendicular to 

 the curving posterior margin. The last one in the right 

 valve is peg-shaped. Behind, there is a rather long lamellar 

 triangular tooth. The posterior muscle-scar is very large, 

 curved, and oval, and placed low down beyond the lateral 

 tooth. The inner margin is smooth and simple. The shell 

 is covered with a dark-brown, smooth, shining, closely-adhe- 

 rent epidermis, which wears off dead shells, remaining last 

 about the umbos. Dead shells are translucent, milky-white. 



Dimensions. — Umbo- ventral diameter, 2'5 mm. ; antero- 

 posterior, 1'9 mm. ; section of closed valves, I'G mm.; a large 

 example is 3 mm. by 2"3. 



Ilahitaf. — 104 fathoms, 35 miles south-west of Neptunes, 

 many alive and dead, and valves. 



Some Ostracoda, taken in the same haul, are very 

 like them. 



Lissarca pubricata, Tate. 



Limopsis ruhricata, Tate, Trans. Roy. Soc. South Anstr., 

 1886, vol. ix., p. 71, pi. v., fig. 6. Type locality, alive from 32 

 fathoms. Backstairs Passage; op. clt., p. 104, No. 138; Tate and 

 May, Proc. Linn. Soc. N.S. Wales, 1901, vol. xxvi. ; part 3, p. 

 437, Pirate Bay, Tasmania; Hedley, Memoirs Aiistr. Mus., 

 1902. vol. iv., part 5, p. 297, valves, 41-50 fms., off Cape Three 

 Points; Pritchard & Gatliff, Proc. Roy. Soc. Vict., 1904, vol. 

 xvii. (X.S.), part 1, p. 246, Western Port. 



Taken alive in Backstairs Passage, 17 fathoms; dead in 

 St. Vincent Gulf, and off Cape Borda, in 62 fathoms, dead, 

 but perfect. It is recorded from Cape Borda, round the 

 coast of Victoria and Tasmania, to New South W-^ales. 



Tate remarks: — ''Probably a young shell, but not re- 

 ferable to any known species." Abundant material proves 

 it to be full grown, and a distinct species. There are 5 

 radial flames, increasing in width as they diverge. Tate gives 

 four. 



Lissarca rhomboidalis, n. sp. PI. xxvii., fig. 7. 

 Shell minute, solid, translucent, horn-coloured, ovate- 

 rhomboid, equivalve, inequilateral, about twice as long be- 

 hind the umbo as in front. Umbos prominent, round, wide, 

 slightly prosogyre. Dorsal border faintly uniformly curved, 

 continuing into the narrowly-rounded anterior end, and into 

 a much more widely-curved posterior end, which is faintly 

 truncated behind. There is a perceptible excavation where 

 the anterior end joins the ventral border. A narrow sub- 

 umbonal area, bounded outside by a straight, slightly prom- 



