Vll. APPENDIX. 



1st. Where Sub-kingdom Vermes is adopted. But the theorj' of 

 evolution by degradation may probably before long cause the dis- 

 appearance of " Vermes " from biological text-books, 



2nd. Where the Mollusca are placed at the head of the Invertebrate 

 Animals. That the Mollusca, as a ivliole, are not higher than the 

 Hexapoda as a ivhole, seems to be confirmed by the recent embryologi- 

 cal researches of M. Fol, who states that " the Mollusca are not 

 segmented animals which have fused their metameres, but they are 

 animals which have remained simple." 



For these reasons, and for others which are given earlier in the 

 Synopsis, I have ventured to adopt an arrangement which appears to 

 me to be, on the whole, best suited for exhibition to the public. I 

 have doue this hoping that student visitors to the collection will find no 

 difficulty in correlating the groups of the present series with those of 

 any of the excellent zoological text-books published for their use. 

 Classes 24, 25, 26, 27 represent the Arthropoda. 

 These are placed in two grades, Malacopoda and Condylopoda, the 

 former of which is constituted by Peripatus. Lankester. 



To Class 26, Arachnida, is referred Limulus, tlie King Crab, 

 and the Trilobites, Lankester. 



Orders Linguatulina, Tardigrada, and Pycnogouida are added in 

 an Appendix of degraded animals belonging to the Class. Lankester. 



Class 27, Hexapoda, is divided into Masticantia and Sugentia, 

 Lankester. But Phryganea, referred to the former, is deficient in 

 mandibles. 



Classes 28, 29, 30, and 31 constitute the Mollusca. 

 Professor Ray Lankester's arrangement of the Mollusca is very 

 interesting, and by his kind permission it is inserted. It is sufficiently 

 obvious that the prefix " Lipo " is from XiVco, the radical form of 

 XeiVo), to be wanting. 



Neomenia is a genus formed by Tulberg for a curious worm-like 

 mollusc newly discovered. 



