A. F. Verrill — Additions to the Fauna of the Bermudas. 27 



beak rather acute, not incurved, but with a small, narrow, reflexed 

 terminal and marginal fold ; posterior sinus rather long, decidedly 

 incurved, ending anteriorly in a broadly rounded angle ; the anterior 

 half of the shell forms about half of a regular ellipse. In the forma- 

 lin preparation there is a thin, white posterior calcareous layer, that 

 has mostly fallen off. The surface is slightly undulated concentri- 

 cally. Length, 32 mm ; breadth, 20 mra . 



Cony Island, buried in sand nearly out of sight, April 4 ; also at 

 Long Bird Island, in shallow water, in May, buried in sand, with 

 only the back slightly exposed. (A. H. V.) 



This species seems to live habitually nearly buried in sand. It is 

 very sluggish and probably cannot swim freely, at least in confine- 

 ment it made no effort to swim. Its back, as exposed, resembles in 

 color a keratose sponge found in the same localities and partly buried 

 in the sand. 



In color and form this species somewhat resembles T. Floridensis 

 Pilsbry (Man. Conch., xvi, p. S2, pi. xxxvii, figs. 15-19), but the 

 latter is described as having the side-flaps " ample," while in the 

 present species they are unusually small. The shell of Floridensis 

 is wide, and quite different in form, being nearly as broad as long, 

 while in our species it is unusually narrow. In respect to the form 

 of the shell, T. Braziliana D'Orb. is much like this, but it has large 

 side-flaps, a tubular mantle-pore, a long neck, and other differential 

 characters. 



Tethys dactylomela Rang. 

 Verrill, these Trans., x, p. 545, 1900. 



Plate III. Figure 3. 



This was very common this year on the shores of Castle Harbor, 

 breeding in April. Its eggs were laid in clusters of long thin, terete, 

 yellow strings, attached by one end to weeds ; the eggs are very 

 small and very numerous, in 6 to 8 rows. The colors were generally 

 as ordinarily described, the ground-color varying from light yellow 

 to dark olive-green. A few that were nearly albinos were seen, and 

 one that was melanistic, the ground-color being so dark that the 

 round black spots were barely visible. 



Placobranchopsis niveus V., sp. nov. 



Plate IV. Figure 10. 

 A very small, nearly pure white species. Mantle broad-elliptical, 

 slightly emarginate anteriorly, and with a distinct lateral branchial 



