. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 378 Bulletin Museum of Comparative Zoology, Vol. 148, No. 8. Figure 4. Cryptx nature of mottled coloration. When sunlight is filtering through bushes, the mottled shells are very hard to see (at least for us). Photo taken by J. IVIartin on northeast coast of Great Abaco. rats, and possibly a bird. The results of these studies will be reported elsewhere (Woodruff and Quensen, in prep.). 3. Patterns of interaction. Populations of the ribby niorphotype once inhabited the bank edge at Eight Mile Rock on the south- west Co
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 378 Bulletin Museum of Comparative Zoology, Vol. 148, No. 8. Figure 4. Cryptx nature of mottled coloration. When sunlight is filtering through bushes, the mottled shells are very hard to see (at least for us). Photo taken by J. IVIartin on northeast coast of Great Abaco. rats, and possibly a bird. The results of these studies will be reported elsewhere (Woodruff and Quensen, in prep.). 3. Patterns of interaction. Populations of the ribby niorphotype once inhabited the bank edge at Eight Mile Rock on the south- west Coast of Grand 13ahama (Plate, 1907). In 1936, Clench and Greenway searched ex- tensively for this form in the area where Millspaugh originally collected it. After two weeks they found only a single dead shell on the eastern side of Hawksbill Creek. Clench (1938) concluded that the hurricane of 1935 may have destroyed this colony, as it did a great deal of damage along the entire south coast of the island. In 1963 and 1964, small samples of ribby shells were again found at Freeport and Smith's Point (speci- mens in the Museum of Comparative Zool- ogy). In September 1972, we spent several days searching the south coast of the island. from Freeport to West End; no Cerion were found. This is the only case we know in which a niorphotype has apparently become extinct on an entire island. On Abaco, however, we need only a map of bank edges to predict exactly where the contacts between ribby and mottled mor- photypes should occur. The village of Sandy Point (Fig. 5) marks the coastal transition from bank edge to bank interior; here we collected a sample of intermediate morphology. The ribby niorphotype inhab- its the coast south of Sandy Point, around the southern tip of the island, up to the narrow area known as The Crossing (Fig. 5). Here, the second contact occurs as the interior, mottled populations are squeezed into close contact with ribby animals on the eastern shore. We observed
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