. The Conchologists' exchange. Mollusks. Tin; NAiiTrnjs. 3 SOME REFERENCES TO THE GENUS OLIVA. IIY JOHN FORI). Of all the marine univalve.* the Olives are perhaps among the most difficult to define sjiecificully. It is true that the most irregu- lar forms can in some instances be readily determined and properly placed by expert conchologists, for however greatly they may differ from the accepted types, certain characters, proving a common ori- gin, are always perceivable. This is especially the case with such species as 0. iiifiata Lam., 0. nuiura Lam., and 0. peruviana Lam. (). To other
. The Conchologists' exchange. Mollusks. Tin; NAiiTrnjs. 3 SOME REFERENCES TO THE GENUS OLIVA. IIY JOHN FORI). Of all the marine univalve.* the Olives are perhaps among the most difficult to define sjiecificully. It is true that the most irregu- lar forms can in some instances be readily determined and properly placed by expert conchologists, for however greatly they may differ from the accepted types, certain characters, proving a common ori- gin, are always perceivable. This is especially the case with such species as 0. iiifiata Lam., 0. nuiura Lam., and 0. peruviana Lam. (). To other species, however, many shells have been assigned which are apparently devoid of characters necessary to sustain the rela- tionship claimed for them. In this group may be included O. ara- neosa Lara., 0. irisans Lam., 0. ispidula Linn., and 0. reticularis Lam. So variable both in form and color patterns are many of the shells assigned to these four species, it is not at all strange that they have been honored with scores of specific names. That a majority of these names are synonymous there is no reason to doubt, but it seems equally apparent that quite a number of the shells, the names of which have been thus subordinated, are really specifically dis- tinct from the types with which they are Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Averell, William D. Philadelphia, Wm. D. Averell
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmollusks, bookyear188
