100 P. F. Dodge — Pleistocene Fossils from Mass. 



Art. XIII. — Additional Species of Pleistocene Fossils from 

 Winthrop, Mass. ; by Kichard E. Dodge. 



Any note concerning the discovery of additional species of 

 shells in the drift of the last Glacial period is interesting 

 because we thus obtain a fuller conception of the richness and 

 distribution of the oceanic fauna previous to the advent of the 

 ice sheet. For that reason, I venture to note here the finding 

 of a few additional species in the drumlin in Boston Harbor, 

 locally known as Winthrop Great Head. This drumlin is the 

 most important of several in Boston Harbor that have furn- 

 ished fragments of shells, from time to time, for of the twenty- 

 six species thus far found, it has given us twenty-three, and 

 the others together but three. Furthermore only three of the 

 species found in this locality have been found in the other 

 drumlins of the harbor. 



The first note of the finding of fragments of shells, in more 

 or less perfect condition, in the clayey till of Winthrop Great 

 Head was made by Dr. Stimpson,* who reported the follow- 

 ing species : JBalanus crenatus Brugiere, Chrysodomus decem- 

 costatus Say, Tritia trivitatta Adams, Urosalpinx cinerea 

 Stimpson, My a arenaria Linne, Ensatella americana Verrill, 

 Mactra solidissima Chemnitz, Venus mercenaria Linne, Cy- 

 clocardia borealis Conrad, Astarte undata Gould, Astarte 

 castanea Say, Mytilis echdis Linne, Modiola modiolus Turton, 

 Ostrea virginiana Lister. In 1888 Mr. W. W. Doclgef re- 

 ported the finding of species of the genera Lacunea, Tapes, 

 and Oarclium. In 1888 Mr. Warren Upham, in a paper before 

 the Boston Society of Natural History,;}: from which the above 

 list has been taken, reported Cliona stdphurea Verrill, from 

 the same locality. 



So far as I can find out, these are the only species reported 

 from this locality up to the present time. Other drumlins in 

 the harbor have furnished occasional specimens of the follow- 

 ing additional species : Lunatia lieros Adams, Saxicava arctica 

 Deshayes, Pecten islandicus Chemnitz. 



Of the specimens mentioned above, the only ones that are 

 at all common in the drift are Venus mercenaria, Cyclocardia 

 borealis and Cliona stdphurea. The other specimens are rare 

 and very fragmentary, so that identification is frequently diffi- 

 cult if not impossible. 



To the above list I wish to add the following, which I have 

 been fortunate enough to find during recent short trips to the 



*Proc. Bost. Soc. Nat. Hist, vol. iv, p. 9. 



fThis Journal, III, vol. xxvi, p. 56, July, 1888. 



% Proc. Bost. Soc. Nat. Hist., vol. xxiv, pp. 127-141. 



