1 28 Zoological Society. 



erect, with the mouth upwards, so that the animal was equally pressed 

 against each side of the shell, was flattened and curved on each side, 

 like the specimen examined by M. Ferussac." 



Mr. Gray also stated that, so far from the animal using the finned 

 arms as sails, they were the means by which it retained itself in the 

 shell ; and he further "observed, that it was very difficult to distin- 

 guish the species of Argonauta, as they varied greatly in shape, and 

 that on a comparison of many specimens, he had found that the 

 presence or absence of the spines or ears at the back of the mouth 

 were of no importance as a specific character, specimens of each of 

 the recorded species having this process developed only on one or the 

 other side. 



The Chairman, (Mr. Owen,) after premising some observations 

 on the diseases to which the mortality of the larger feline animals 

 in the Society's Menagerie was attributable, proceeded to read the 

 following description of two Entozoa infesting the stomach of the 

 Tiger, (Felis Tir/ris, Linn.,) one of which forms the type of a new 

 genus of Nematoidea. 



" I received a few days ago, from the Medical Superintendent of 

 the Society's Menagerie, a portion of the stomach of a young Tiger 

 (which died of rupture of the aorta), exhibiting on the internal or 

 mucous surface what were considered to be scrofulous tumours. 

 They were five or six in number, of a round and oblong form, vary- 

 ing in size from half an inch to two inches in the largest diameter, 

 and the largest of them projecting about half an inch from the plane 

 of the inner surface : they made no projection externally. The mu- 

 cous membrane covering the smaller tumours was puckered up into 

 minute reticulate ruga: the surface of the largest tumour was smooth. 

 On wiping away the tough thick mucous secretion from the tu- 

 mours, and examining more closely their surface, two or three orifices 

 presented themselves in the larger, and a single orifice in each of the 

 smaller tumours. These orifices conducted to irregular sinuses which 

 were the nidi of two kinds of Nematoid Entozoa, some measuring 

 nearly an inch in length and a line in thickness; the others being 

 more minute, not exceeding 5 lines in length, and about ^ of an 

 inch in diameter. Only a pair of the larger Entozoa were found in 

 each of the three largest tumours ; the smaller species existed in 

 countless numbers. 



" Before proceeding with the description of the worms, I may 

 briefly conclude the history of the tumours by observing that they 

 were composed of condensed accumulated layers of the sub-mucous 

 cellular tissue, presenting a flat surface next the muscular coat, to 

 which the larger tumours firmly adhered, and projecting with a 

 rounded convexity towards the cavity of the stomach, where the si- 

 nuses opened and terminated. They did not contain any of the 

 caseous secretion characteristic of struma, but were most probably 

 caused by the irritation of the Entozoa. 



" The dimensions of the larger Entozoa above given are those of 

 the female : the male is about one fourth smaller. In both sexes the 

 body is slightly attenuated at the two extremities ; the caudal ex- 



