Head, Nantucket, and their Fossils. 15 



*CUMINGIA TELLINOIDES Conrad. (Desor and Cabot, 1849, 

 p. 342). Plate III. figure 3. 



Very common in the lower shell bed, No. 1, and also found in 

 the Serpula bed, No. 2. 



*ENSIS DIRECTUS Conrad. (Solen ensis, Desor and Cabot, 1849, 

 p. 342). 



Fragments of this species are abundant in the lower shell bed, 

 but complete specimens are rare. It also occurs less commonly in 

 beds 2 and 3. 



*SPISULA SOLIDISSIMA Dillw. (Mactra solidissima, Verrill, 1875, 

 p. 374). 



Found frequently in the upper shell bed, No. 3 and occasionally 

 in bed 4. 



*MESODESMA ARCTATA Conrad. (Ceronia arctata, Verrill, 1875, 

 p. 374). 



Common in the upper shell bed No. 3, and found this last sum- 

 mer in material from bed No. 4. 



MESODESMA DEAURATA Turton. (Mesodesma Jauresi, Hollick, 

 1896, p. 9). 



This is reported by Hollick but the exact bed is not given. It 

 is referred to the upper shell bed No. 3, until other findings give 

 its exact position. 



*MYA ARENARIA Linn. (Desor and Cabot, 1849, p. 342). 



Shells of this species are abundant in the lower shell bed, No. 1, 

 and some few are found in bed No. 3. Many of the shells have 

 beautiful dendritic markings. 



MYA TRUNCATA Linn. (Verrill, 1875, p. 373). 

 Verrill reports several large shells of this species from the upper 

 shell bed, No. 3. 



CORBULA CONTRACTA Say. (Verrill, 1875, p. 371). 

 A single valve of this species was found by Verrill in material 

 taken from the lower shell bed, No. 1. 



*SAXICAVA ARCTICA Linn. (Verrill, 1875, p. 371). 

 Found in beds 1 and 3. The specimens from the upper shell bed 

 are much more numerous and larger than those of the lower bed. 



