TYPICAL OBJECTS IN NATURAL HISTORY. 121 



Ordo II. CLADOCERA. 



Daphnia quadricornis B. 



Chydorus {Lynceus) sphcericus B. 



Ordo III. COPEPODA. 

 Cyclops vidgaris B. 



Legio III. PCECILOPODA. 

 Ordo I. SIPHONOSTOMA. 



Argulus foliaceus (on Stickleback) B. 



Ccdigits Mtdlcri (on Cod) B. 



Lepeophtheirus (Caligtis) Stromii (on Salmon). ... B. 



Ordo 11. LERN^ID^. 



Chondracanthus lophii B. 



Lemcea branchialis B. 



The following list for the Cirripedia is communicated by C. Darwin, Esq. 

 Subclassis CIRRIPEDIA. 

 Ordo I. THORACICA. 

 Pollicipes mitella (best type for the order). 

 Fam. 1. Balanidas (sessile Cirripeds). 



Siibfam. 1. Balaninae Batanus tintinnabulum. 



porcatiis B. 



2. Chthamalinae Chthamalus stellatus . . B. 



Catophragmus polymerus 



(as connecting Balanidse 



with Lepadidaj). 



Fam. 2. Verrucidse Verruca stromia B 



3. Lepadidae (pedunculated 



Cirripeds) Lepas anatifera B 



Ordo II. ABDOiMINALIA. 



Cryptopliialus minutus. 

 Ordo III. APODA. 

 Proteolepas bivincta. 



EADIATA. 



Among these, G. Busk, Esq. has furnished the following list for the class 

 Anthozoa. 



Classis ANTHOZOA. 

 Subclassis I. A. hydroida. 

 Ordo I. TUBULARINA. 



Fam. I. Corynidse Conjne pusilla B. 



2. Tubulariadae Tubularia indivisa B. 



