176 SYSTEMATIC PALEONTOLOGY 



LuciNA UHLEEi Clark. 

 Plate XXXYII, Figs, i, 5, (i, 7. 



Lucma uhleri Clark, 189.5, Johns Hopkins Univ. Circ, voL xv, p. 5. 



Lucina iihleri Clark, 189(5, Bull. 141, U. S. Geol. Survey, p. 79, pi. xxi, figs. la-Id. 



{?) Lucina ulrichl Harris, 1S97, Bull. Amer. Pal. No. 9, p. 71, pi. xiv, fig. 4. 



Description.—" Shell small, orbicular, slightly tumid: surface with nu- 

 merous uniform, eleA'ated, concentric ridges; anterior and posterior sides 

 rounded; lunules slightly depressed; interior with radiating striae; mar- 

 gin simple." Clark, 1896. 



The original figures of this species did not show the muscular scars 

 and the teeth accurately. The figures here published correct these de- 

 fects. 



It is evident that Professor Harris has spelled the name ulriclii unin- 

 tentionally. The form from AVood's Bluff is probably the same as that 

 from Mainland. The apparent difference in the hinge, noted by Pro- 

 fessor Harris being an inaccuracy in the old figures which are here re- 

 placed by a correct one. It would be a misfortune if we had to use two 

 names, as nearly alike as ulileri and iilrichi, for two forms with as slight 

 differences as these show. 



This is the most abundant and widely distributed of our Maryland 

 Eocene Lucilias. 



The types are immatm-e. 



Length, 9 mm.; height, 8 mm. 



Occurrence. — jSTANJEiiOY Fokmatiox. Popes Creek, Woodstock. 

 Aquia Poemation. Clifton Beach. Upper Marlboro, Potomac Creek. 

 Glymont, 1 mile northeast of Piscataway, Mattawoman Creek, 1 mile 

 southeast of Mason Springs, 2 miles below Potomac Creek, Liverpool 

 Point. 



Collections. — Maryland Geological Survey, Johns Hopkins University. 



Lucina whitei Clark. 

 Plate X XXVII, Figs. 8, 8a, 9. 



Lucina whitei Clark, 189.5, Johns Hopkins Univ. Circ, vol. xv, p. 5. 



Lucina ichitei Clark, 1890, Bull. 141, U. S. Geol. Survey, p. 79, pi. xx, figs. ort-3c. 



Description. — "■ Slioll siiiall. sulxubirular. glolinse: surface with prcuui- 

 neut concentric lamellae, interni])ted posteriorly by shallow fold, extend- 



