models for the Museum ; two of these can be now obtained from him, 
1. Model of Amphioxus, showing the general relations and dis- 
positions of the organs as seen from the left side. Price, £2 2s. 
(110, about.) 
This is a reproduction of the original wax model forming part of 
the series of models and drawings prepared to illustrate the struct- 
ure of Amphioxus for the Index Museum of the British Museum 
(Natural History). The different organs are distinctively colored, 
and the model shows at a glance all the more important anatomical 
relations of the animal. The disposition and relations of the central 
nervous system, notochord, alimentary canal (pharynx, liver, anus, 
etc.), the epipleural cavity with its backward extension towards the 
anus, the cardiac and dorsal aortte, are all clearly shown together 
with other details. 
2. Enlarged model of the left side of the lower jaw of a young 
Ornithorhynchus, showing the tooth germs in situ. Price, 10s. 6d. 
($2.60, about.) 
The following quotation from the label attached to the original 
preparation and model in the Index Museum of the British Museum 
(Natural History) will fully explain its nature : 
"In the 
In the young si 
cifled cusps, beneath the region in which the horny plates are afterwards 
developed. 
" The small glass vessel contains the left side of the lower jaw of a young 
Ornithorhynchus, prepared to show the tooth germs in situ, the characters 
of which are more clearly shown in the enlarged model placed by it." 
Communications relating to the above to be addressed Richard S. 
Wray, 23, St. Germain's Road, Forest Hill, London, S. E. 
I can only recommend these highly instructive models to every 
student of Biology. G. Baur, New Haven, Conn. 
