LAMELLIBRANCHIATA. 3 



glossj ; hinge composed of two .small cardinal teeth beneath the umbo in the left 

 valve and one in the right, also a long posterior lateral in each valve ; a very slender 

 lififament is attached to the margin of the valves behind the umbones ; the internal 



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ligament has apparently dropped off. 



Length, 6 millim. ; altitude, 5 ; diam., 3 '5. 



Hut Point, Oct. 25, 1902. 



One specimen only. Differing in form from Kellia magellanica, Smith. Also 

 somewhat resembling the British K. suborbicularis, Montagu, yet different in shape, and 

 having a more delicate hinge. 



TeLLIMYA ANTARCTICA. 



(PI. 11. , figs. 16-1 6b.) 



Shell very small, transversely ovate, rather convex, inequilateral, white, covered 

 with a dull yellowish periostracum, marked with very fine incremental lines ; anterior 

 side much shorter than the posterior, rounded ; ventral outline broadly curved ; 

 umbones antemedian, only a little prominent, somewhat eroded ; liinge consisting of 

 two strong cardinal teeth in the left valve {fig. 16b, l), none in the right ; ligament 

 central, beneath the umbones (figs. 16a-b, 2) ; interior of the valve smooth, but 

 exhibiting lines of growth ; margin smooth, slightly thickened ; posterior adductor scar 

 pyriform, anterior apparently smaller. 



Length, 3 millim. ; height, 2"5 ; diam., 1*5. 



Hut Point, Feb. 13, 1904. 



Only one specimen was obtained. Short, and more solid than the northern 

 T. bidentala, Montagu, also having a stronger hinge. 



Cyamium denticulatum. 

 (PI. IIL, figs. 4-4b.) 



Shell small, rounded, rather convex, almost equilateral, rather thin, whitish, 

 covered with a very thin, glossy, yellowish periostracum, marked with very fine 

 strise of growth and numerous shallow, narrow, and not very conspicuous radiating 

 sulci or impressed lines. The latter are visible on the inner surface of the valves, 

 which are finely denticulate at the margin ; the muscular impressions are indistinct. 

 Hinge composed of two diverging teeth in the right valve (fig. 4b, t.), and three 

 in the left (figs. 4a, t.), the anterior in the right and the central one in the left 

 being somewhat bifid. The posterior lateral margin of both valves is produced 

 into a pseudo-lateral tooth (figs. 4a, 4b, m.) ; the ligament (figs. 4a, 4b, 1.) is oblique, 

 posterior to the teeth, and mostly internal ; but a slight portion is visible externally, 

 when the valves are closed, just behind the tip of the umbones ; the prodissoconch 

 forms a circular, smooth, glossy, white, convex disc at the apex of each valve. 



Length, 4*3 millim. ; height, 4 ; diam., 3. 



Hole 3. In 12| fathoms, stones and gravel. 



z 2 



