224 BuiJvETlN 29 388 



from the Monte Cristi beach, among which are some identical in 

 every respect with our fossils from the bluffs. 



Locality. — (Kxp'd '16) Bluff 3, Cercado de Mao. (Rather 

 rare) . 



Tellina (Merisca) Sandi-Dominici, n. sp. 

 Plate 38, Figure 11 



Shell small, ovate, with two distinct posterior sulci and cor- 

 responding folds between ; valves somewhat discrepant in form, 

 the right being a trifle more inflated, appearing shorter and high- 

 er and the left being a little more strongly sculptured. The sur- 

 face is ornamented with fine, ridged, concentric lamellae, appear- 

 ing under a lens very delicate, sharp and frosty ; right hinge 

 with distinct fine laterals, lacking in the left. Length 1 1, altitude 

 8, diameter 4 mm. 



Locality — (Exp'd '16) Bluff 3, Cercado de Mao. 



Tellina (Scissula) cercadica, n. sp. 

 Plate 38, Figure 9 



Shell very thin and delicate, oblong, beaks nearly central, 

 low ; anterior and basal margins rounded, posterior truncate ; 

 umbonal ridge angulated distinctly but not sharply ; surface 

 with fine concentric lines of growth, strongest posteriorly, and 

 with very beautiful, regularly spaced, ornamental striae which 

 anteriorly are concentric, soon become oblique, sloping down- 

 wards at variance with the growth-lines, then suddenly end after 

 crossing the center of the valve and on approaching the umbonal 

 ridge ; the sculpture of the right* and left valve is similar ; hinge 

 teeth delicate but distinct ; no internal strengthening rays are 

 present. Length 26, altitude 18, semidiameter 3 mm. 



This pretty species is strikingly like specimens in the New- 

 comb collection labelled T. delicatula Deshayes from Panama and 

 from the Gulf of California. Our fossils undoubtedly represent 

 the ancestral stock of this recent West Coast shell. 



Locality. — (Exp'd '16) Bluffs, Cercado de Mao. (Abund- 

 ant). 



