Expeditions organized or participated in by the Smithsonian . keys that are separated by tortuous channels of varying width anddepth. Practically every key examined, no matter how small, pro-vided it bore vegetation, was found to be inhabited by Cerions of theC. glaus group. The shells on each key present differences sufficientto enable one to distinguish them. For example, in size alone, 500of those collected about Bastion Point filled a 3-pint measure, whilethe same number from the neighborhood of our temporary laboratory, 6o SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 60 the Wh
Expeditions organized or participated in by the Smithsonian . keys that are separated by tortuous channels of varying width anddepth. Practically every key examined, no matter how small, pro-vided it bore vegetation, was found to be inhabited by Cerions of theC. glaus group. The shells on each key present differences sufficientto enable one to distinguish them. For example, in size alone, 500of those collected about Bastion Point filled a 3-pint measure, whilethe same number from the neighborhood of our temporary laboratory, 6o SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 60 the White House. near Sharp Rock Point, required a 5-pintmeasure to contain them. There are also other characteristicsbesides dififerences in size. On account of the many puzzhng phenomena regarding their dis-tribution, it was thought desirable to gather large series of specimensof Ccrion and associated mollusks for careful study and experimen-tation. Of Ccrion alone about specimens were collected from asmany localities as possible. This was done with the idea of intro-. FiG. 66.—Two races of Bahama shells (Ccrion) planted Ijy Dr. Bartsch onkeys between Miami and Tortugas, Florida. Photograph by National ^Museum. ducing some of them into other islands, so that the effect of a changeof environment could be studied later. The partv returned to Nassau on ]\Iay 26. and then set sail forMiami, where it remained until the end of the month. During thistime a fine series of that most beautiful of all North American landshells, Ligiins, was secured, as well as a g;oodly number of otherspecies. A number of dredge hauls were made north of Cape Florida,in shallow water, by the Anton DoJirn and a tine series of marineinvertebrates secured. On May 31 the expedition sailed south for Key West. On thiscruise, and during- the stay at Miami, the two races of BahamaCerions were introduced at different points. NO. 30 SMITHSONIAN EXPLORATIONS, I912 61 During the cruise from Miami to Key West, a s
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1912
