Head, Nantucket, and their Fossils. 17 



*SCALA FRAGILIS Gray? (Scala , Cushman, 1905, p. 195). 



A single specimen of this species was found by the writer in the 

 loose material this last summer. For a clue as to the relations of 

 this puzzling specimen I am indebted to Dr. W. H. Dall. 



*CREPIDULA CONVEXA Say. (Verrill, 1875, p. 370). 

 Found in both beds, 1 and 2, but it is not common. 



*CREPIDULA FORNICATA Lam'k. (Desor and Cabot, 1849, p. 342). 



This species is abundant in the lower shell bed No. 1 and is also 

 found, in much less numbers, in beds 2 and 3. In some cases the 

 original color of the shell is very well preserved. 



*CREPIDULA PLANA Say. (Verrill, 1875, p. 370). 

 Common in bed No. 1, also found in bed No. 3, but in fewer 

 numbers. 



*CRUCIBULUM STRIATUM Say. (Verrill, 1875, p. 373). 



Verrill reports one large specimen of this species from the upper 

 shell bed No. 3. Merrill also reports it from this bed. There are 

 specimens of this species in the collection at Nantucket. 



*LUNATIA HEROS Say. (Verrill, 1875, p. 373). 

 Found in both of the upper beds, 3 and 4. The specimens have 

 usually lost their organic matter and the shells are very fragile. 



*Var. TRISERIATA Say. (Verrill, 1875, p. 373). 

 Verrill records a single specimen of this banded form from the 

 upper bed, but it is fairly common there. 



NEVERITA DUPLICATA Say. (Verrill, 1875, p. 373). 

 A single broken specimen is recorded by Verrill from the upper 

 shell bed. 



CINGULA (ONOBA) ACULEUS Gould. (Rissoa aculea, Merrill, 

 1896, p. 13). 



Merrill records this species from bed No. 4. 



CAECUM PULCHELLUM Stimpson. (Merrill, 1896, p. 14). 

 Recorded by Merrill from bed 4. 



*CERITHIOPSIS GREENII C. B. Adams. (Verrill, 1875, p. 370). 



Verrill records four specimens of this species from the lower 

 bed. There is no other record from these deposits until that of 

 the single very perfect specimen found in the loose materials this 

 last summer by the writer. 



