1890.] 



PROF. G. B. HOWES ON HATTERIA. 



359 



m. 

 iv. 



VI. 



vii. 



Carcases. 



1 "Pro-atlas" 



(J, 240 mm | present on both sides. 



240 inm ■ " '^ 



Senile (^ , 225 mm. 



$, 220 mm 



<:^, 210 mm 



present on both sides, 

 present on both sides, 

 present on both sides, 

 present on both sides. 



Vomerine teeth 

 last traces, 

 absent. 



present on right side only, 

 absent. 



present, bilaterally symme- 

 trical, 

 absent, 

 absent. 



viii. 2, 182 mm damaged. 



ix. 5 ! 158 mm present on both sides. 



Five of the above-named specimens are in the teaching collection of the 

 Normal School of Science and Eoyal School of Mines, S. Kensington ; for 

 the opportunity of examining three others Prof. Howes was indebted to his 

 former pupil Mr. A. Vaughan Jennings, who had just returned from Kew 

 Zealand, and for the remaining one he had to thank his Demonstrator, 

 Mr. M. P. Woodward. 



The occasional absence, mutilation, or reproduced condition of the tail render 

 measurements expressive of the total length of the body of a Lizard of little 

 value. Those given above express the length of the body along the mid-ventral 

 line, from the posterior edge of the symphysis ischii (which can be readily felt 

 through the skin) to the anterior one of the symphysis mandibuli. 



igament and skull, 



Hatteria punctata. 



Fig. 1. Anterior palatal region of skull, showing bilaterally symmetrical vome- 

 rine teeth. (Young [sexually mature] (5'.) 



Fig. 2. Similar view of a second specimen, showing asymmetrical condition of 

 the teeth together with their mode of suppression, and apparent 

 duplication on the right side. 



Fig. 3. Dorsal aspect of the occipito-atlantal region to show the " pro-atlas " 

 in relation (right side) to the occipito-atlantal ligament and 

 and (left side) to the dorsal episkeletal muscles. 

 Beference letters. — m., dorsal episkeletal muscles ; n.p., posterior nares ; pi., 



palatines; pt., pterygoids; vc, vomers; i, "pro-atlas"; ii, atlas; iii, axis 



vertebra, 



Four of these showed the teeth in an unmistakable form ; and in 

 all which had not been macerated he found, whether teeth were 

 present or not, a couple of thickenings of the mucous membrane, 

 in the region which they occupied, beneath which there lay corre- 

 sponding ridges of the vomers. He had noted the presence of these 



25* 



