34 INVERTEBRATE ANIMALS. 



Group 100.— Family VOLUTIDiE. Volutes. Estimated 

 number of species : recent, 100 ; British, ; fossil, 80. 

 Cretaceous, &c. 



^ Examples of Voluta, Cymha, Melo, including the 

 very beautiful and rare Lyria Lyrceformis. 

 presented by S. Smith. 



Upper Compartment. 

 Observe the highly coloured interior of V. JSthi- 

 opica, Dennison collection. 



Group 101.— Family TURBINELLIDiE and alhes. turho, 

 a top. Estimated number of species : recent, 118 ; 

 British, 0; fossil, 48. Cretaceous, &c. 

 Turbinella, Fasciolaria, Fastigiella. 



Upper Compartment. 



Armlets, made from the Chank- shell, and worn 

 by natives in Ceylon. 



Curious linear arrangement of egg- capsules, sup- 

 posed to belong to some species of the present 

 group. Presented by Captain Mortimer. 



Group 102.— Family DACTYLID^. gaxruAoj, a finger. 

 Three very characteristic sub-families are combined in 

 this group, the Olives, the Harps, and the Ancillse, all 

 tropical or sub-tropical in their distribution. It may be 

 noticed that the present and five preceding groups are 

 represented in British seas by a single species only, and 

 appeared not earlier than the chalk formation. Esti- 

 mated number of species : recent, 161 ; British, ; 

 fossil, 70. Cretaceous. 



Oliva, Harpa, Ancilla. 



H 0. Lahuanensis, discovered and presented by 



C. COLLINGWOOD. 



Upper Compartment. 



Malformations. Gaskoin Collection. 



