. Bulletin. Natural history; Natuurlijke historie. COROSAURUS ALCOVENSIS 11. Fig. 6. Partial skeleton of Corosaurus alcovensis, map plan of YPM 41031. 1 = left humerus; 2 = dorsal ribs; 3 = left scapula; 4 = dorsal vertebrae; 5 = left ulna; 6 = left radius. Hatched lines denote impressions. although the interpretation of some of these bones has changed. Only those portions which were never collected, such as the block of six middorsal vertebrae (Case 1936, p. 4), are missing. The bulk of the known Corosaurus material is in the collection of the Field Museum of Natural History, Chicago. Zangerl
. Bulletin. Natural history; Natuurlijke historie. COROSAURUS ALCOVENSIS 11. Fig. 6. Partial skeleton of Corosaurus alcovensis, map plan of YPM 41031. 1 = left humerus; 2 = dorsal ribs; 3 = left scapula; 4 = dorsal vertebrae; 5 = left ulna; 6 = left radius. Hatched lines denote impressions. although the interpretation of some of these bones has changed. Only those portions which were never collected, such as the block of six middorsal vertebrae (Case 1936, p. 4), are missing. The bulk of the known Corosaurus material is in the collection of the Field Museum of Natural History, Chicago. Zangerl (1963) preliminarily described the largely disarticulated posterior half of a skeleton making up one of these specimens (FMNH PR480). In the undescribed material are the remains of over a dozen additional individuals. Unfortunately, most are preserved only as isolated or associated vertebrae, ribs, and gastralia, and many such specimens, collected from a single locality near Freeland, Wyoming, have been lumped together under one catalogue number (FMNH PR135). Aside from FMNH PR480, the Chicago collection contains four other Corosaurus fossils, of varying quality, which represent significant portions of single individuals and which are very useful in a study of the whole animal. Some of these specimens have, like the holotype, been collected as groups of bone-bearing limestone blocks and have required reassembly prior to study. Map plans of the two most useful Chicago skeletons are given in Figures 4 and 5. The Corosaurus fossils collected for the present study are now housed in the Yale Peabody Museum of Natural History. Two of these specimens [YPM 41030 and 41031 (Fig. 6)] are partial skeletons; each is contained in a single block. The remainder of the Yale collection consists of isolated bones. From a combination of the existing specimens, most of the bones in the skeleton of Corosaurus alcovensis are now known. Only the phalanges of the pes and the interclavicle are poorly
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