MUSEUM OF COMPARATIVE ZOuLOGY. Gl 



No. 4. — List of the Brachiopoda from the Island of Anticosti, 

 sent by the Museum of Comparative Zoology to different Insti- 

 tutions in Exchange for other Specimens, with Annotations. 

 By N. S. Shalek. 



Lingula Bruqiere. 

 Lingula elegantula Shaleh. 



Shell large, oblong, transverse diameter a little over one half the distance 

 from beak to border; margin opposite the beak evenly rounded; sides 

 straight for over two thirds the height of shell, suddenly converging to the 

 beaks; apical angle, 110°; cardinal edges straight; diameter at right angles 

 to valves one fifth the height. Valves moderately, nearly equally, convex. 

 Homologue of toothed valve most convex, depressed mar the bonier; sur- 

 face with fine concentric lines of growth accumulated in low plications on 

 the sides, no radial striae. The surface of all the specimens is of a beautiful 

 iridescent blue color, apparently the original hue of the shell. 



Height, 1.7 inches; width, 1 inch. — Upper twenty feet of Junction Cliff, 

 west end of Anticosti. 



Lingula Forbesi Billixgs. New species of Lower- Silurian Fossils; Geol. 

 Sur. Canada. June, 1862. — West end of Anticosti. 



Strophomena (Rafinesque) Blainville. 



Strophomena semiovalis Shalek. 



Shell semi-oval, transverse diameter from one fifth to one seventh great- 

 er than from the beak to the border ; hinge-line straight, slightly alate ; 

 sides slightly converging until a little below the middle, thence rapidly con- 

 verging, sometimes slightly produced opposite the hinge-line. Socket-valve 

 flat or slightly concave, over the surface of the visceral disk, which occupies 

 from one half to two thirds the distance from beak to border, then rather 

 sharply deflected ; depth of valve equal to one third the length from beak 

 to border. Surface covered with close-set, irregular radial stride of several 

 sizes, in irregular alternation, crossed by very fine concentric lines. Near 

 the hinge-line are several irregular undulations, which do not extend to the 

 middle of the visceral disk. Area of socket-valve narrow, almost linear, 

 interrupted by a small cardinal process. Area of toothed valve rather 

 broad, half a line wide in specimens measuring one inch from beak to bor- 

 der. Fissure narrow, with a V-shaped deltidium. — Ellis Bay, Anticosti. 

 Division D, Canada Geological Survey. 



