Miscellaneous. 167 



admission of air disappear, and two tubes, which might be taken for 

 horns, issue from the anterior dorsal jiart of the 2)upa. It is at the 

 surface of these horns that the peculiar stigmata of the pupa are 

 seated ; and I have ascei'taincd that these orifices, to which no at- 

 tention has been paid, are in considerable numbers. In the adult 

 there is no longer any trace of these respiratory orifices at the place 

 which they occupied in the pupa ; but seven pairs of stigmata htive 

 been produced on the sides of the thorax and abdomen. This mul- 

 tiplicitj' of the stigmata coincides with the increase of the respiratory 

 activitj', denoted by the pci'fection of the tracheal apparatus. 



Of all the organic systems the circulatory system undergoes the least 

 important transformations. In the larvae of the Volucelhe the heart, 

 extended in a straight line from one extremity of the body to the 

 other, has the aortic portion very short ; in the adult the heart 

 becomes incurved to take the form of the body, and a long aorta 

 traverses the thorax. 



One of the most essential facts which springs from this investiga- 

 tion of the organization of the Volucellie is, that, at least in the Diptera, 

 the development of certain apparatus of the adult is accomplished by 

 a transfoimatiou of the organs of the larva}, whilst the development 

 of other apparatus is effected by entirely new formations. — Comptes 

 Bendiis, December 21, 1868, tome Ix^-ii. pp. 1231-1234. 



Sphenodou, Hatteria, and Rhynchocephalus. 

 By Dr. J. E. Geat. 



In the first part of my * Zoological Miscellany,' published in 1831, 

 I shortly described the skull of an Agamoid Lizard, of verj" peculiar 

 structure, that I had seen in the Museum of the CoUege of Surgeons, 

 and I pro^josed to regard it as a new genus, named Sphenodon. 



In the second part of the same work, published in 1841, I de- 

 scribed a Lizard, which I had received in spirits from Xew Zealand, 

 under the name of Hatteria punctata. 



Professor Owen, in the first volume of the ' Descriptive Catalogue 

 of the Osteological Series contained in the Museum of the Eoyal 

 CoUegs of Surgeons,' published in 1853, at p. 142. nos. 662, 663, de- 

 scribed with considerable detail the skull and the five vertebrae of 

 the tinink of a Lacertian wliich he names lihiincliocephaJus. The 

 skull so named is evidently the same as that I described in the 

 * Zoological Miscellany,' in 1831, as Sphenodon, though the speci- 

 men is said in the Catalogue to have been presented by Px'of. Owen, 

 whose name certaiuly was not attached to the specimen when I de- 

 scribed it. The specimen is stdl in the collection, but without the 

 lower jaw, which was with it in 1831. 



When I described the Hatteria imnftata from the specimen in 

 spirits I had no idea that it was the same Lizard that I had described 

 from a skull under the name of Sphenodon ; for it is not easy to 

 observe the characters on which the genus Sphenodon was described 

 without dissecting the animal. 



A second specimen of Hatteria arriving at the British Museum, 



