438 



Mr. T. Davidson. On Brachiopoda. [May 23, 



tlie middle of the valve and extending to the front, and more or less 

 distinctly margined on either side by a faint raised line or ridge : beak 

 incurved and truncated by a small circular foramen, loop long and 

 reflected : length 44, width 34, depth 29 millims. 



7. Waldheimia Wy villi, n. sp. 



Only one example of this shell was dredged off Valparaiso ; lat. 

 33° 31' S., long. 74° 43' W., at a depth of 2,160 fathoms. 



The shell is longitudinally oval, very thin, semi-transparent, smooth, 

 light brownish-yellow ; valves moderately convex, and rather flattened 

 along the middle in dorsal valve. Loop long, reflected ; length 19, 

 width 14, depth 10 millims. 



In external shape it somewhat approaches to Waldheimia cranium, 

 but differs from it in several respects. 



8. Terehratella Frieli, n. sp. 



Shell small ovate, smooth, white ; valves moderately convex, loop 

 doubly attached ; length 10, width 9, depth 5 millims. Two examples 

 were dredged off Halifax, lat. 41° 15' K, long. 65° 45' W., in 1,340 

 fathoms ; and two other specimens, which appear to be referable to the 

 same species, near the Philippine Islands in from 82 to 102 fathoms. 



I have felt much uncertainty with respect to the identification of 

 this species. Dr. Gwyn Jeffreys considers it to be new, and to be 

 referable to the genus Terehratella. 



9. Megerlia (?) incerta, n. sp. 



This is a new and very remarkable species. I did not like to sacri- 

 fice one of the two or three specimens in the attempt to develop the 

 loop, and therefore am unable to pronounce any decided opinion as to 

 the genus among the Terebratulidee, to which it should be referred. 

 The strong general resemblance it bears to Megerlia truncata induces 

 me to provisionally leaving it in that genus. In external shape it is 

 semi- circular, small, somewhat broader than long, hinge-line, straight, 

 with obtuse cardinal angles, semi-transparent, whitish ; valves very 

 moderately convex, ventral valve a little deeper than the opposite one, 

 and slightly longitudinally depressed along the middle ; beak small 

 and truncated by an incomplete circular foramen laterally margined 

 by small deltidial plates ; beak margin very sharply defined, leaving 

 between them and the hinge-line a sharply defined narrow area ; sur- 

 face of both valves marked by numerous rounded radiating ribs ; 

 length 8, breadth 9, depth 4 millims. It was dredged in lat. 1° 47' IS., 

 long. 24° 26' W. 



10. Megerlia Willemoesi, n. sp. 



Shell oval or longitudinally oval, broadest anteriorly, tapering 



