50 



LAMELLIBRANCHIATA. 

 Sanguinolites Tethys. (N. sp.) 



Plate 4, figs. 5, 5a. 



Description. — Elongate ; dorsal and ventral margins sub-parallel ; 

 anterior extremity rounded, most extended at about one- third the height; 

 posterior extremity obliquely truncated; beaks at about one seventh the 

 length of the shell from the anterior ends, closely appressed ; a strong 

 obtusely rounded convexity extends from the beaks to the ventral poste- 

 rior angle. Length, three and one-half inches j height, about fifteen 

 lines ; depth of both valves, nine lines. 



Only one specimen, an internal cast, of this species has been collected. 

 The ventral margin is imperfect, but it appears to have been gently con- 

 vex, with a slight sinuation just anterior to the mid-length. The hinge- 

 line is straight and two-thirds the length of the shell, slightly elevated 

 posteriorly. The slope of the posterior margin occupies about one-third 

 of the whole length. The posterior ventral angle, narrowly rounded or 

 sub-acute. Above the diagonal convexity, which extends from the beak 

 to the lower posterior angle, the sides are compressed or slightly concave. 

 Below it^^they are gently convex, with a broad shallow concavity from the 

 beak to the ventral margin. 



The characters of the hinge line cannot be made out from this speci- 

 men. It seems, however, to have had an external ligament. Just below 

 the dorsal edge and parallel to it, there is an obscure groove in the cast, 

 indicating a tooth or a ridge on the shell. Surface unknown. 



Locality and Formation. — Grand Gr^ve, Gaspe. No. 8. 



Collector.— Bell. 



GONIOPHORA MEDIOCRIS. (N. Sp.) 



Fig. 21. 



Fig. 21. — GoNioPHORA MEDIOCRIS. Internal cast of a left valve. 



1^- Description. — Length ;0f the cast of the interior about two inches ; 

 greatest height,Hnear the mid-length) one inch ; base gently conv3x with 



