130 PALEONTOLOGY OF NEW JERSEY. 



but I can find no description of the species or reference to the figures, and 

 I presume none were ever written. I have, however, retained Mr. Conrad's 

 specific name, althougli it cannot belong to the genus Cyclas of Klein if we 

 are to accept Lucina divaricata as the type of the group as given by many 

 authors. Witli regard to the true generic relations of the shell I am not 

 certain, but it seems to possess the characters of Lucina dentifera Jonas, as 

 given in Chenu's Manual, so far as they can be ascertained from the very 

 imperfect material, not having the lateral teeth developed to any perceptible 

 extent. 



Formation and locality. — In the micaceol^s clays below the Lower Marls 

 at Haddonfield, New Jersey. 



Lucina Smockana, n. sp. 

 Plate XVIII, Figs. 21 and 22. 



Shell of about a medium size, nearly circular in outline, as shown on 

 internal casts, with comparatively ventricose valves and evidences of a 

 somewhat thickened shell. Fillings of the rostral cavities distant, directed 

 gently forward and almost centrally situated in reference to the outline of 

 the shell ; also with appearances of a deep, rather wide, lunular area and a 

 moderate inflection of the valves along the ligamental groove. Muscular 

 scars of moderate size, the anterior ones reniform, as long again as wide ; 

 the posterior one longer and proportionally narrower ; pallial line entire, 

 well marked, and situated near the margin of the valves, and from its indent- 

 ation on the cast would indicate a considerable tliickening of the shell just 

 outside of its limit. Along the posterior umbonal slope there is a broad, 

 distinct furrow on the cast, showing the existence of a decided furrow below 

 the postero-cardinal margin. Hinge characters and surface structure of the 

 shell unknown. 



A single well-preserved cast, of one and five-eighths inches diameter, 

 occurs in the collection of the Academy of Natural Sciences of Philadelphia, 

 giving the features above described. The specimen has been studied by 

 some one, and marked on its surface in ink "Dosinia, N. J.," showing 

 its source to be from this State. The want of sinus in the pallial line 



