FIG. 2. Nest site of _T. m. calvatus_ (excavated by investigator) on open sand bar shown above in Fig. 1, June 1, 1954. Note tracks of turtle in foreground leading toward and away from disturbed area at left. [Illustration: PLATE 51 FIG. 1. Eggs of _T. m. calvatus in situ_, June 1, 1954, approximately six inches below surface, from nest shown in Fig. 2, Pl. 50. Note sandy substrate and seemingly irregular arrangement of eggs. FIG. 2. Eggs of _T. m. calvatus in situ_, June 1, 1954; nest located at brim of incline shown in foreground of Fig. 1, Pl. 50. Note gravelly substrate (in foreground) and symmetrical arrangement of eggs.] [Illustration: PLATE 52 Lectotype of _Trionyx spinifer_ Lesueur, Museum d'Histoire Naturelle, Paris, No. 8808 (× 1/5); obtained by C. A. Lesueur from the Wabash River, New Harmony, Posey County, Indiana. _Top_--Dorsal view. _Bottom_--Ventral view.] [Illustration: PLATE 53 Lectotype of _Trionyx muticus_ Lesueur, Museum d'Histoire Naturelle, Paris, No. 8813 (× 1/2); obtained by C. A. Lesueur from the Wabash River, New Harmony, Posey County, Indiana. _Top_--Dorsal view. _Bottom_--Ventral view.] [Illustration: PLATE 54 Skull of holotype of _Platypeltis agassizi_ Baur (= _T. s. asper_), MCZ 37172 (× 1), Savannah River, Georgia. _Top_--Dorsal view. _Bottom_--Ventral view.] 28-7818 UNIVERSITY OF KANSAS PUBLICATIONS MUSEUM OF NATURAL HISTORY Institutional libraries interested in publications exchange may obtain this series by addressing the Exchange Librarian, University of Kansas Library, Lawrence, Kansas. Copies for individuals, persons working in a particular field of study, may be obtained by addressing instead the Museum or Natural History, University of Kansas, Lawrence, Kansas. There is no provision for sale of this series by the University Library, which meets institutional requests, or by the Museum of Natural History, which meets the requests of individuals. However, when individuals request copies from the Museum, 25 cents should be included, for each separate number that is 100 pages or more in length, for the purpose of defraying the costs of wrapping and mailing. * An asterisk designates those numbers of which the Museum's supply (not the Library's supply) is exhausted. Numbers published to date, in this series, are as follows: Vol. 1. Nos. 1-26 and index. Pp. 1-638, 1946-1950. *Vol. 2. (Complete) Mammals of Washington. By Walter W. Dalquest. Pp. 1-444, 140 figures in text. April 9, 1948. Vol. 3. *1. The avifauna of Micronesia, its origin, evolution, and distribution. By Rollin H. Baker. Pp. 1-359, 16 figures in text. June 12, 1951.