Reviews — Seeley's Index of Fossil Birds and Reptiles. 35 



mens of Secondary Eeptiles, &c., contained in the Cambridge 

 Museum. The arrangement of the specimens is intended for educa- 

 tional purposes. The Osteological collection consists of bones, 

 classified according to the part of the skeleton to which they belong, 

 so that the student is able to trace the gradual variations of similar 

 bones in diiferent species. Each bone is numbered, so as to be easily 

 replaced in its proper position in the case. Wo also observe that the 

 peculiarities of many of the specimens are briefly and carefully noted. 

 Thus, among the Ichthyosauri, we have, " Case 10, shelf b. No. 14. 

 A small Atlas and Axis, veiy short from front to back, and at both 

 ends heart-shaped, with the very long inferior sides convex." Again, 

 among the Lias Eeptiles, we find, "Case 87, shelf d. No. 2, 3. 

 Cranial region of a large and undescribed Teleosaur, from the Lias of 

 Whitby. It corresponds closely with the cerebral part of a Plesiosaur 

 head. It has been sawn through to show the brain cavity, in which 

 may be distinguished cerebral lobes, optic lobes, and cerebellum ; also 

 olfactory and optic nerves. It differs much from crocodiles, and 

 makes some approach to serpents and turtles, and probably differs 

 but little from the brain of a Flesiosaur. Teleosaws make so many 

 approximations to Plesiosaurs, as to show that they form a group of 

 crocodiles of equal value with the crocodiles now living." 



Some of the more remarkable animals recorded in this catalogue 

 are the follovidng : — Among the reptiles from the Purbeck strata we 

 find four new species of Pleurosternon, and from the same strata a 

 new species of a large Pterodactyle, P.macrurus (Seeley), represented 

 by a fragment of the lower jaw, 12^ inches long, and, where 

 fractured behind, the rami measure 2|^ inches from side to side ; 

 and a caudal vertebra of the same species, o inches long. From the 

 Kimmeridge Clay, we have a terrestrial reptile, Gigantosaurus 

 megalonyx, indicated by a centrum of a cervical vertebra, 8-| inches 

 wide and deep, and 4^ inches from back to front, and also by a 

 caudal vertebra 6 inches long, 3f inches high, and 4 inches wide ; 

 and by two casts of a claw -phalange. The list of specimens from the 

 Cambridge Coprolite bed occupies about half the book. The Ornitho- 

 sauria are referred to a new genus, Ornithoclieirus, and the twenty- 

 four species are said to be chiefly founded on the characters of the 

 upper jaw. The bones are briefly enumerated. There is a list of 

 numerous fragments of Aves, referred to a new genus, Enaliornis. 

 The Dinosauria are referred to the genus Acanthopholis (Huxley), 

 besides which there are the remains of the remarkable animal, the 

 Macrurosaurus, of which only caudal vertebra have yet been obtained. 

 The Ichihyosauria, according to Mr. Seeley's views, afford evidence 

 of the existence of at least four distinct species of Ichthyosaurus, 

 besides /. campyloclon (Carter). These new species have been 

 founded on the characters of their humeri and femora. The Cro- 

 codilia are represented by Crocodilus Cantahrigiensis (Seeley). The 

 Plesiosauria consist of twelve species of Plesiosaurus, of which seven, 

 species are new. Of one species of Polyptychodon, and three species 

 of a new genus, Stereosaurus, in which "the limb bones develop 

 neither heads nor trochanters" (p. 18). The Chelonia contain on© 



