112 PATELLA-PATINA. 



each side of it three strong lateral teeth, of which the inner one is 

 more or less fused with the median at their bases. The inner lat- 

 eral (fig. 21) and the median lateral were rather similar to one 

 another, the second lateral (ng. 19a, a, 20a, a) being only somewhat 

 stronger, with somewhat S-shaped base (fig. 19); the cusps being 

 on both strong but narrow. The outer lateral was much stronger 

 than the others ; the basal-plate broader (fig 25) ; the cusp broad, 

 three-cuspidate, the outer cusp shovel-shaped, the two inner nar- 

 rower, more acute. Of the 3 uncinal teeth on the pleura of each 

 side (figs. 23-26), the outer is larger (fig. 23), the inner the smallest. 

 They show themselves often as if fastened on the upper part of the 

 basal-plate of the outer lateral tooth (figs. 23, 24). All three pairs 

 of lateral teeth show the basal part and the outer portion of the 

 cusp amber-yellow, the intermediate part was almost as clear as 

 glass. The side cusps were light horn-yellow. The length of the 

 basal-part of the middle lateral tooth is about 0"15" mill. ; the height 

 from 0"15-0"16 mill. The length of the base of the outer lateral 

 tooth 0-145-0-15, the breadth 0-14 mill.; the height of the tooth 

 016-0-18 mill. ; the breadth of the cusp was about 0-12-0-13 mill. ; 

 the length of the outer side-cusp O'l, the middle 0*08, the inner 

 0-056 mill. The cusp of the outer was 0-025 mill. high. 



In the stomach was found a large-celled vegetable mass, similar 

 to that found in various Pleurophyllids. 



Sargasso Sea. 



Patina tella Bergh, Beitriige zur Molluskeu des Sargassomeeres, 

 in Verhandlungen der k.-k. zool.-bot. Gesellschaft in Wien, xxi, p. 

 1297, t. 12, f. 12-26 (1871.) 



The explanation of figures is as follows : 



12. Head, from above. 



13. Head, from in front. 



14. Sole of the foot. 



15. Buccal mass from the side ; a anterior end, b broken radula 

 sheath. 



16. Buccal mass from below, a, h, as above. 



17. Front or cutting plate of the jaw, cutting edged turned uj)- 

 ward. 



19. Median ridge, inner and middle lateral teeth from the under 

 side. 



20. Median ridge, inner and a middle lateral tooth, obliquely 

 from beneath. 



