430 Bibliographical Xotices. 



Maas, O. — "Die Craspedoten Meduseu." Ergebnisse der Plankton- 

 Expedition. 1893. 



Murray, G. — " Exploration of the Intermediate Depths of the Ocean." 

 GeogT. Journal, xiii. pp. 147-154. 1899. 



EXPLAXATION OF PLATES IX. & X. 



Fiff. 1. Laodice Chapmani, sp. n. 



Fig. 2. Ditto. Genital organ upon one of the radial canals (>-.c.). 



Fig. 3. Ditto. An ocellus seen from the side near the root of a radial 

 tentacle {te.). 



Fig. 4. Bythotiara Mun-ayi, gen. et sp. n. 



Fig. 5. Ditto. Diagram showing- the bifurcation of the radial canals (r.c.) 

 and their relation to the base of the manubrium and its genital 

 ridges (g.). 



Fig. 6. Aglantha i-osea, with normally developed conical process upon 

 the exunibrella. 



Fig. 7. Ditto. Exunibrella with shrunken conical process. 



Fig. 8. Ditto. Portion of umbrella margin near the termination of one 

 of the radial canals (r.c.). The velum (v.) has partially sepa- 

 rated from the umbrella along the line of the circular canal, 

 and the zone of tentacular depressions {te.') has separated with it. 



BIBLIOGRAPHICAL NOTICES. 



Zoological Wall-plates. By Prof. Dr. Paul Pfurtscheller. 

 Pichlers, Witwe, and Son : Yienna and Leipsic. 1902. 



Judging by the sample plates which have been sent us, the zooto- 

 mic 1 wall-diagrams of Prof. Pfurtscheller should find many 

 purchasers in this country. They are obviously the outcome of a 

 practical experience in the teaching of elementary zoological 

 anatomy, and in small class-rooms would prove admirable adjuncts. 



Geological Survey of Canada. Contributions to Canadian Palaeon- 

 tology. — Vol. VII. Part 2. On Vertehrata of the Mid-Cretaceous 

 of the North-ioest Territory. By H. F. Osborx and L. W. Lambb. 

 4to. 84 pages ; with frontispiece, 20 plates, and 24 blocks of 

 text-figures. Ottawa, 1902. 



I. Distinctive Characters of the Mid- Cretaceous Fauna. 

 By Harry Fairfield Osborn. 



The determination by the Canadian Survey of a Mid-Cretaceous 

 and freshwater fauna, including fishes, batrachiaus, reptiles, and 

 mammals, is a forward step of great importance in vertebrate 

 palaeontology. The Belly-River formation has been determined 

 geologically to be Mid-Cretaceous, lying lower in the series than the 

 Montana [?J and the Fort Pierre and Fox Hills groups, and lying 

 above the Fort Benton and Dakota. The Belly-River vertebrate 



