*889.] Recent Books and Pamphlets. 427 
show that Hypophthalmus possesses an air-bladder connected 
with the auditory organ by intervention of a Weberian ap- 
paratus, formed of parts of the anterior vertebrae, modified 
after precisely the same plan as in the other siluroids ; but 
that the apparatus in question and air-bladder exhibit a re- 
duction recalling that in the genera Z^r/V^rm and Hypostomus. 
It is enclosed by an extension of the occipital bone, which 
explains why it has been overlooked by naturalists hitherto. 
The author bases his conclusions on a series of sections, 
selections from which are represented in three plates which 
accompany the paper. 
RECENT BOOKS AND PAMPHLETS. 
Barrois, OiZ^.— Observations sur la Constitution G^ologique de 1' 
ouest de la Bretagne. Extract des Annales de la Societe G60I- 
ogique du Nord, T. xvi., seance du 7 Nov., 1888. From the 
Author. 
Bates, H. ZT.— Discontinuities in Nati 
American Anthropologist, April, 
Boulanger, G. A.— An Account of the Fishes Obtained by Surgeo 
Major A. S. G. Jayakar, at Muscat, East Coast of Arabia. E 
tract from the Proceedings of the London Z06I. Soc, Dec. 2 
1887. From the Author. 
ngniart, Charles.— S)\ix un Nouveau Poisson fossile du t 
houiller de Commentry (Allier) Pleuracanthus Gaudryi. 
Sur un Nouvel insecte fossile des terrains carbonifer 
Commentry (Allier) et sur la faune entomologiqu 
houiller. Extracts Bull. ' " ■■ - -- ^ • - 
Troisieme serie. Tome s 
