66 DR. SAMBON ON INTERNAL PARASITES. [Feb. 18, 



Mr. Burne also exhibited a specimen showing an aspiratoi^ 

 contrivance of a somewhat similar character in the Sea- Bream 

 {Pagellus centrodontus) *, by the action of which a current of water 

 is drawn into the anterior nostril, passes over and through the 

 olfactory rosette, and is expelled by the posterior nostril. 



The mechanism consists of two accessory membranous sacs that 

 open into the hinder end of the olfactory chamber and are so 

 placed that in the resting state with the mouth shut they are 

 compressed respectively by the process of the premaxilla and by 

 the dorsal margin of the maxilla. As the mouth opens the sacs 

 expand by the withdrawal of these bones from contact with 

 them, biit are again compressed when the mouth is shut. Similar 

 sacs have been observed in many Acanthopterygian Fishes. 



Mr. Burne also showed a section of the head of an Albatross 

 {Diomedea exidans)f, in which the brain and the olfactory chamber 

 had been exposed to show the relatively enormous development 

 of the olfactory organ (text-fig. 16, p. 65). The olfactory bulbs 

 measured 7 mm. in diameter, and received large nerves from the 

 nasal sepum and lateral wall of the olfactory chamber. (The rest 

 of the cerebral hemisphere measured 30 mm. in length.) The 

 olfactory eminence or pseudo-turbinal was also remarkably deve- 

 loped and lay for the most part in a special backward prolongation 

 or recess of the general cavity of the nose. Except for the Ki-Avi 

 (Apteri/x), this is apparently the most highly developed organ of 

 smell recorded among birds. In this specimen the opening of 

 the duct of the nasal gland upon the edge of the atrial pseudo- 

 turbinal, close to the border of the nostril, was also shown. 



Dr. L. W. Sambon, F.Z.S., exhibited a large series of speci- 

 mens of internal parasites obtained by him from animals recently 

 living in the Society's Gardens. He laid stress on the important 

 additions to knowledge to be derived from an adequate investi- 

 gation of such material, and on the practical results to the health 

 of the animals in the Gardens that might be expected. 



* No. E 95, Physiol. Series, R. College of Surgeons' Museum, 

 t No. £ 116 a, Pliysiol. Series, R. College of Surgeons' Museum. 



