248 SCAPHANDER. 



shells of Scaphander puncfo-ttriatus (Migh.) are squatter, rounder, 

 \vitli a flatter crown, and have the outer lip less produced behind ; 

 their stippled sculpture, which varies a good deal, is often coarser, 

 and forms more continuous spirals ; the pillar-lip, too, and shape of 

 the body are very different. In one of the specimens, from station 78 in 

 particular, the slow wasting away of the surface has scarcely attacked 

 the stippled pits of the spirals which accordingly remain projecting 

 as tint round tubercles. 



Specimens probably referable to this species are also said to have 

 been collected by the ' Challenger' off Sydney, E. Australia, in 410 

 fins., an extraordinary distribution if really established (See Smith, 

 Proc. Mai. Soc. Lond. i, p. 60). 



S. WATSONI Dall. PI. 31, fig. 18. 



Shell slender, delicate, white or yellowish, polished, posteriorly 

 attenuated, with the outer lip and aperture produced behind the 

 apex ; transverse sculpture, none beside the delicate lines of growth, 

 which are perceptible chiefly at or near the tips ; spiral sculpture 

 consisting of some twenty-five sharp, strong, channelled, clear-cut 

 grooves, not punctate or in any way irregular, except that they are 

 more crowded near the summit than elsewhere, about half being 

 within the posterior third of the shell ; between these near the ex- 

 tremities, and near the margin of the outer lip, are a few more deli- 

 cate intercalary grooves; posterior apex a minute pit, punctured in 

 the centre, from which the free margin rises, extends backward 

 somewhat more than half a millimeter, then downward, forward 

 almost in a straight line, then with a wide sweep up and around to 

 join the slightly thickened margin of the body, into which it passes 

 imperceptibly; body with a light-wash of callus; axis coiled so as 

 to be pervious to the summit when viewed from in front. Lon. of 

 shell and aperture, 8*75. Max. lat. of body, 2'5 ; of entire shell, 

 4*25; of aperture, 3'25 ; min. lat. of aperture, 0'75 mill. (Dalf). 



Off Sombrero Island, 54-72 fms. ; Barbados, 100 fms. ; off Bahia 

 Honda, 84 fms; off Hatter as, 63-324 fms. 



Scaphander f watsoni DALL, Bull. M. C. Z. ix, p. 99, 1881. 

 ind'i' u-nt.,ni DALL, Blake Rep., p. 52, pi. 17, f. 10. 



It is possible that this will prove to be a Plnl'mr when the animal 

 is known, hut the form and aspect are those of a Scaphander. In 

 general outline it recalls S. ligmtrius L., though more slender, more 

 attenuated and pointed behind and with the free margin more 



