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Show Plate XXIII. XXIV. XXV. XXVI. XXVII. XXVIII. XXIX. XXX. XXXI. XXXII. XXXIII. XXXIV. XXXV. xvm Page 1-5. Chromodoris reticulata. 6. C.sykesi. 7,8. C. cava, i 1-3. Ckromodoris annuMa. 4. C. elizabetkina. 5,6.^ obO C. nigrostriata. 7. C. lineata. 8, 9. C.fiava .... I Avagina incola Hybrid Grouse (Lagopus lagopus <$ X Lyrurus tetrix $ ) 411 Male Chigetai (Equus hemionus) j. 431 Female Kiang (Equus hemionus kiang) > Anthracotherium magnum 456 Telerpeton elginense ) 1, 2. Telerpeton elginense. 3. Procolophon trigoniceps. I 470 Telerpetcn elginense ' N e w Species of Tropical South American Erycinida. . 481 Articulation of Mandible in Theriodonts 490 |