LAMBLLIBRANCHIATA OP THE LOWER MARLS. 163 



The shell somewhat closely resembles Dosinia Gabbi, herein described, 

 in the delicacy of the valves and the inflection of the cardinal margins, but 

 is quite distinct in the form of the outline, that one being broader, rounder, 

 and less erect. There may be considerable doubt as to the generic rela- 

 tions of this species, as none of the generic features have been clearly as- 

 certained, and the reference is made entirely from the external appearances 

 of a few sliells destitute of the most of the cardinal portions, and one in- 

 ternal east, on which the markings are so faint as not to be considered reliable. 



Formations and localities. — From the Lower Grreen Marls at Upper 

 Freehold, New Jersey, and from near Marshallville, New Jersey. 



Genus TENEA Conrad. 1871. 



(Am. Jour. Concb., Vol. VI, p. 72.) 



Tenea pinguis. 



Plate XXII, Figs. 1-3. 



Lucina innguis Conrad. J. A. K Sci., Phil., new ser.. Vol. II, p. 275, PL XXIV, Fig. 18. 

 L, ■pinguis (Con.) Meek. Cbeck-list, p. 12 ; Geol. Surv. N. J., 1868, p. 726. Gabb, 



Synopsis, p. 138. 

 Biplodonta parilis Conrad. J. A. N. Sci., Vol. IV, p. 278, PI. XLVHI, Pig. 16 (by 



error given Pig. 8 in text, p. 278). 

 Mijsia gibbosa Gabb. J. A. N. Sci., Vol. IV, p. 302, PI. XLVIII, Fig. 17 (not fig. 18). 

 Tenea jyarilis Conrad. Jour. Am. Concb., Vol. VI, p. 73, PI. Ill, Fig. 12. Kerr's Geol. 



Rept. isr. C, p. 8, Appendix, PI. II, Fig. 25. 

 T. pinguis (Conrad) Gabb. P. A. N. S., 1876, p. 307. 



Specimens of small size. Casts nearly circular in outline, but a little 

 higher than long. Valves very gibbous, inflated on the umbones. Beaks 

 large and elevated, rather strong, incurved forward ; cardinal line arcuate 

 behind and excavated in front of the beaks. On the posterior side the 

 cardinal border is deeply sunken, showing the existence of a rather wide 

 or inflated hinge plate. Muscular scars rather large and but faintly marked; 

 pallial line deeply and angularly sinuate, the sinus directed upward, point- 

 ing- nearly toward the apex of the cast. 



The specimens which preserve the shell, and used by Mr. Conrad as 

 the types of the genus Tenea, are smaller than most of the casts observed. 

 The surface is comparatively smooth, or marked only by fine concentric 



