73 Zoological Society : — 



colour are sometimes seen on the shoulder, and especially on the 

 sides and on the upper parts of the extremities. The snout and the 

 under parts are paler, and the disk of the snout is colourless. 



The eye is protected by two external swollen eyelids, but the 

 lower eyelid forms a double fold, the external of which is merely a 

 fold of the cutis, the internal being transparent and representing an 

 internal eyelid. There is no membrana nictitans ; the pupil is 

 round ; the lens round, somewhat compressed ; no pecten. The 

 small size of the eye evidently shows that the animal is nocturnal. 



There are no teeth ; the edge of the jaws is obtuse and truncated, 

 especially that of the lower jaw. Upon examination of the cavity of 

 the mouth, it is found as spacious as the natural entrance is narrow. 

 Behind the articulation of the mandibula, and on the side of the 

 hinder insertion of the tongue, opens a large cavity, covered inside 

 with a strongly-folded mucosa, and outside with a stratum of mus- 

 cular fibres ; the end of the bottom of this extends behind the head, 

 and is situated near the insertion of the musculus supraspinatiis at 

 the shoulder-blade. Supposing this cavity to be a vocal sac, I do not 

 think that it will be found in females ; and it is a peculiarity of this 

 animal that the vocal sac is covered by a muscular stratum, thus 

 being quite separated from the skin ; nor am I acquainted with any 

 other instance in which the vocal sac reaches so far backward. The 

 entire upper part of the cavity of the mouth is very concave, and co- 

 vered by such a thin mucosa as to render the whole configuration of 

 the bone transparent. Near the middle of the palate, and somewhat 

 laterally, the inner nostrils are situated, being roundish-oval and of 

 moderate size. The anterior part of the pharynx is separated from 

 the hinder part by a cartilaginous transverse pad ; and the latter 

 part deserves the name of a palatum molle, inasmuch as it is pro- 

 vided with a soft body covered with a mucosa, as a similar one is 

 found at the same place in the Cyprinidce. Between the tongue and 

 cartilage thyreoidea is situated a spacious cavity, such as is generally 

 found in Anura beneath the tongue ; it is quite closed. I think it is 

 a bursa mucosa. 



Concerning the situation of the intestines, the following is to be 

 noticed. The heart is situated somewhat towards the right side of 

 the medial line ; and it is a highly interesting fact that it is sur- 

 rounded by the liver in a similar way as in higher animals, as in 

 other Batrachians it is surrounded by the lungs. The stomach is 

 quite on the right side, and partly covered by the left hepatic flap, 

 separated from the heart only by a part of the peritoneum : it is 

 on its left side. The right lung is behind the liver ; the left lung 

 is larger and is placed behind the liver and stomach. The situation of 

 the other intestines is the same as is generally found in the Anura. 



The glottis is a simple cleft ; the larynx and trachea are conspi- 

 cuously separated by a pair of excessively large, thick, and soft liya- 

 menta vocalia. The larynx itself is very spacious, and forms nearly 

 the cavity of a globe ; the trachea is of a similar form, separated 

 from the lungs only by a slightly produced fold of the mucosa. 

 The lungs and the vascular system do not differ from those organs in 



