126 



REPORT — 1855. 



and its chemical composition is introduced to the right ; the name is addeo 

 below. The whole does not occupy 5 feet by 2, although blank spaces are 

 left for the species not yet obtained. 



Geology. 



As no returns have yet been received from geologists, perhaps we may 

 improve upon the suggestions offered in the Circular, by asking, in addition, 

 for lists of such genera as first occur in each formation, and also of such 

 as disappear in each. It will be serviceable to those who cater for Museums, 

 to receive references to localities whence the typical rock specimens may be 

 most readily obtained. 



P.S. Since the above was in type, Professor Huxley has suggested the fol- 

 lowing arrangement as an approximation to a scheme which shall exhibit the 

 equivalent classes and sub-classes of the animal kingdom. The brackets imply, 

 that in his opinion there is good reason for fusing into one group the sub- 

 classes thus united, and giving a new name to the whole, to be regarded as 

 equivalent to the other sub-classes. Where (H?) is added to a group, he 

 considers it very doubtful whether such is really an equivalent to the other 

 sub-classes. An (R) is placed after those groups which were united by 

 Cuvier under Radiata. Professor Huxley proposes at the next meeting of 

 the Association to read a statement of his reasons for proposing the above 

 classification, and to discuss any points in it which may ajjpear doubtful to 

 other naturalists. 



I. Vertebrata. 



(^Abranchiata.) 



Mammalia. 



Aves. 



Reptilia. 



{Branchiata.) 



Amphibia (H?). 



Pisces. 



II. MoLLUSCA. 



(§A.) 



{Heteropoda. 

 Gasteropoda 

 dioecia. 

 f Pulmonata. 

 \ Pteropoda. 



HI. 



Insecta. 

 Myriapoda. 



Annulosa. 

 (§A.) 



Arachnida. 

 Crustacea. 



Gasteropoda 

 nionoecia. 



Lamellibranchiata. 



(§ B. Molluscoida.) 



{Brachiopoda. Ascidioida. 



Polyzoa (R). 



(§ B. Annidoida.) 



Annelida. Scoleidae (H?). 



Trematoda (R). 

 Echinodermata. Tainiadae (R). 



Turbellaria (R). 

 Rotifera(R.H?). Nematoidea(R.H?). 



,} 



IV. CCELENTERATA. 



Hydrozoa (R). Actinozoa (R). 



V. Protozoa. 



{Infusoria (R). 

 Noctilucidae. 



Spongiadffi (R)- 

 Foraminifera (R). 



Gregarinidae (R), 

 Thalassicallidae (H?). 



