195 St. Maurice and Claiborne Pelecypoda . 195 



bern on the Neuse River. It certainly has a very Miocenic 

 aspect. 



So!en lisbonensis Aldnch, PI. 59, Fig. 2 



►S". lisbonensis Aid., Geol. Siirv. Ala. Bull., No. i, iS86, p. 37, pi. 4, 



fig. 4. 

 S. {Plectosofen) lisbonensis T>a.\\, Trans. Wag. Ill, 1900, p. 953. 



Aldriclfs original description. — Shell linear, nearly straight ; pos- 

 terior sub-truncate ; anterior obliquely rounded with a depressed space be- 

 hind running to the beaks ; lines of growth prominent, bending at right 

 angles along a line running obliquely from the beaks to the junction of the 

 posterior and ventral margins. Anterior widely gaping. Lisbon, Ala., 

 just above the Buhrstone. 



Especially common in Buhrstone at Ft. Gaines, Ga. 



To this speci es Dall has added a variety, op. cit., called 

 abruptics, characterized as follows : This form, represented by 

 numerous fragments, differs from Aldrich's figure by its more 

 abrupt anterior truncation and relatively wider valves. It will 

 probably, when more complete specimens are obtained, prove to 

 belong to a distinct species. Locality. — Clark Co., Miss. 



Cultellus (Ensiculus) conradi Cossmann, PI. 59, Fig. 3 



Ensiculns conradi Cossmann, Notes Supl., 1894, p. 5, pi. i, fig. i. 

 Cultellus iyE.) conradi T)a\\, Trans. Wag., Ill, 1900, p. 958. 



Cossniann's original description. — Testa depressiuscula, antice abbre- 

 viata ac subovalis, postice elongataet elatior; umbones parvi, haud prominuli; 

 cardo cum dente antico perpendiculari et dente postice sub marginem parall- 

 el, cicatriculamusculi anterioris, angusta, prselonga, atque radiatim impressa. 



Coquille deprimee, court, r^trecie et ovale de cote anterior plus dila- 

 tee et allongee du cote posterieur ; le bord sup^rieur parait rectiligne, les 

 crotchets tres petits et a peine courbes en avant, n'y font aucune saillie. 

 Toute la surface est lisse, avec de faibles stries d'accroissement qui indiquent 

 bien la contour de la coquille complete, sur le seul fragment que je possede. 

 La charniere de la valve droite se compose d'une dent anterieure ^troite et 

 saillante, presque perpendiculaire au bord cardinal, tandisque la dent pos- 

 terieure forme un bourrelet parallele au bord. L'impression du muscle 

 adducteur est etroite et allongee : elle prend naissance centre la callosite 

 du rebord ant^rieur et s'etend obliquement vers le cot^ anal, marque de 

 petits rayons peu saillants. 



