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Show 198 MR. J. G. GOODCHILD ON THE [Apr. 6, the subject far enough to speak with confidence in regard to other differences noticed. Fig. 22. P'g- 23. Gallinago. Scolopax. From the central forms of the Limicolee nearly all the modifications of style observable in the Carinatae could be traced without difficulty ; and the forms now remaining to be considered join on naturally enough to such types as that represented by the Plovers. In one direction, and at no remote distance from the Plovers, we come to the Rails, represented in fig. 24. In another direction, Fig. 24. Fig. 25. Rattus. Sterna. gradations equally gentle conduct us to the Gulls and the Terns (fig. 25). Along another line of modification we arrive at the Cranes. The Storks again stand at no great distance. Each of the forms here mentioned, in turn, leads to others more distantly removed from the central type. Beyond the Gavise lie the Pygopods, represented by Alca (fig. 26). These in turn graduate easily into the Tubinares, as represented by Pvffinus and by Diomedea (fig. 27). Closelv resembling these last in style of wing-coverls follows Sula (fig. 28) and Fregata (fig. 29), which lead the way to one of the extreme modifications of style observable in this particular, exemplified by Plotus (fig. 30). Starting from another point, the |