62 MR. p. E. BEDDARD ON THE ANATOMY [Jan. 15, 



pp. 65, 66), and not very much longer than those of a similarly- 

 sized Iguana tuberculaia. Generally speaking, it is undoubtedly 

 correct to describe the Lacertilia as possessing short bronchi, to 

 which rule, indeed, Varanus offers the only very marked exception. 

 The relations of the bronchi to the lungs are not shown in 

 Shufeldt's figure*, where the heart obscures the same, and are 

 wrongly shown in the figure of Miller f. The latter author is 

 wrong (unless, indeed, the lungs of Heloderma suspectum, examined 

 by myself, are abnormal) in not indicating, in the figui'e referred to, 

 a conspicuous branch of the bronchus developed equally on both 

 sides of the body. When the trachea divides, the dorsal median 

 fibrous wall lying between the disjunct ends of the tracheal 

 semirings is continued down each bronchus. As Dr. Shufeldt has 

 remarked, the calibre of each bronchus is not far short of that of 

 the trachea itself. They are, in fact, particularly wide. The ends 

 of the bronchial semirings are, of course, visible on either side of 

 the median fibrous tract. The bronchus approaches the lung and 

 becomes adherent to its mesial side and runs down in contact with 

 it for some distance until it finally enters the lung. At the point 

 of contact the iipper ends of the semirings, i. e. those lying 

 headwards, cease to be parallel with the lower ends and diverge 

 headwai'ds. The dorsal membranous space ceases, and the semiiings 

 in that section of the bronchus which is closely applied to the lung 

 embrace the lung. There is, in fact, a branching of the bronchus, 

 and this short branch may be seen to be lined by cartilaginous 

 semirings for a short distance into the interior of the lung. This is 

 not the case with the following apertures of communication between 

 the bronchus and the lung. I cannot bvit think that this branch 

 is comparable to that already referred to in Varamis. It is 

 further not without importance to notice that this " eparterial 

 bronchus " in Heloderma is not serially comparable to the apertures 

 which place the cavity of the bronchus into communication with 

 the interior of the lung and which follow it. For the latter are 

 more ventral in position, as is plainly to be seen in the accompanying 

 figure (text-fig. 16). The "eparterial bronchus" is more dorsal 

 and is, in fact, lateral with reference to the main stem of the 

 bronchus. 



The figure (text-fig. 16) which illustrates the branching of the 

 bronchus before entering the lungs also shows on the left side 

 the intei-ior of the lung as seen when the bronchus is slit up after 

 it has given off the branch referred to. I have thought it worth 

 while to introduce this view of the lung of Heloderma, since the 

 figure given by Miller J does not appear to me to represent quite 

 accurately the mode of communication between the interior of 

 the bronchus and the lung-substance, nor does he indicate the 

 adherence of the bronchus to the lung for a considerable distance 

 before entrance. He does, however, illustrate the important fact 



* Loc. cit. pi. xvi. fis. 3. t Journ. Morph. 1893, pi. vii. fig. 5. 



X Loc. cit. pi. vii. fig. 5. 



