Bibliographical Notices. 397 



tho types of the various names are indicated. This will he very 

 useful for future reference. 



At the end of the volume we find a list of unrecognized species, 

 some of which will probably be identified and referred to their 

 proper position at some future time. 



The Fauna of British India, including Ceylon and Burma. Pub- 

 lished under the authority of the Secretary of State for India in 

 Council. Edited by W. T. Blanford. — lifujnehuta. Vol. II. 

 Part 1 (Heteroptera). By W. L. Distant. London, 1903. 

 Pp. x, 242; figs. 167. 



As we are informed that the next part of this work, completing the 

 second volume, will appear very shortly, we will defer our detailed 

 notice until then, and confine ourselves for the present to recording 

 the publication of the present instalment, which extends from 

 Fain. 4. Lvgaeidaj to the commencement of Fam. 12. lleduviidu). 



Memoirs of the Geological Survey. — Palceontologia Indica. Series IX. 

 The Jurassic Fauna of Cutch. Vol. III. Part 2. The Lamelli- 

 branchiata. No. I. Genu's Trigonia. By F. L. Kitchin, M.A., 

 Ph.D., Geol. Survey England. 122 pages, Fol. Plates I.-X. 

 Calcutta, London, and Berlin, 1903. 



The Trigoniai of Cutch here figured and described have been selected 

 from among the Lamellibranchs collected by Wynne, Tedden, 

 Stoliczka, and Blanford, and entrusted to Dr. Kitchin, of London, 

 for examination and description. The strata from which they came 

 are known as the following groups : — I. The Oomia group, probably 

 combining the Cretaceous, Neocomian, partly the Portlandian ; 

 II. The Katrol, probably combining the Kimmeridgian and Ox- 

 fordian, and constituting the Upper Jurassic of Cutch ; III. The 

 Charee, probably representing the Kelloway strata, Middle Jurassic 

 of Cutch ; IV. The Patchum, probably representing the Bath Oolite 

 group. These are enumerated in the second edition of the ' Manual 

 of the Geology of India,' 1893, p. 217. 



The classification of the known fossil Trigonice into sections, 

 groups, and genera is carefully considered and clearly explained. In 

 some cases these serial divisions and subdivisions of recognized 

 forms are separated from their several allies by gaps variable in 

 extent and value, but evidently reducible by better knowledge of 

 the types. The most reliable observers and authors concerned in 

 this classification have been: — Agassiz, 1840; d'Orbigny, 1843; 

 Pictet, 1866; Stoliczka, 1871 ; Lycett, 1872-1883; Bayle, 1878; 

 Choffat, 1S85; and Bigot, 1892. Their methods and results are 

 succinctly stated at pages 7-9. 



The differences due to the progress of growth in individuals (as in 

 growth-stages) are taken into consideration on the lines more or 



