xiv CONTENTS. 



PAGE 



From the Class Tunicata. 

 Prep. 2 2. Dissection of Ascidian {Ascidia affinis), showing 

 the homological relations of its various systems 

 to those of the Lamellibranchiata 66-71 



From the Class Polyzoa. 

 Prep. 23. Specimens of Broad-leafed Hormvrack {Flustra 



foliacea) 71, 72 



Prep. 24. Specimen of Bugle Coralline {Salicornaria farci- 



minoides) 73 



From the Class Insecta. 

 Prep. 25. Specimen of Larva of Death's-head Moth (Ache- 



rontia atropos) 73-76 



Prep. 26. Specimen of Pupa of same species 76-78 



Prep. 27. Specimen of perfect Insect of same species . . . 78,79 

 Prep. 28. Dissection of Larva of Goat Moth (Cossus ligni- 



perda), showing the organs of vegetative life . 79-82 



Prep. 29. Dissection of Larva of Privet Hawk Moth {Spldnx 



ligustri), showing the nervous system . . . 82-85 



Prep. 30. Dissection of Common Cockroach {Periplaneta 



orientalis), showing its digestive, renal, nervous 



and reproductive organs 86-90 



From the Class Crustacea. 



Prep. 31. Specimen of Common Crayfish (jistocws^wmaiiYis) 90-98 



Prep. 32. Dissection of Common Crayfish {Astacus Jluvia- 

 tilis), showing the nervous, digestive, and circu- 

 latory organs in situ 98-100 



Prep. 33. Dissection of Common Crayfish (Astacus Jluvia- 



fz'fo's), showing the heart and arteries .... 100-102 



Prep. 34. Dissection of Common Crayfish (Astacus fiuvia- 

 tilis), showing its digestive, respiratory, and 

 reproductive organs in situ 102-105 



Pi'ep- 35- Dissection of Common Crayfish (Astacus JfMvia- 

 tilis), showing its nerve system. Tables of 

 homologies of nerve-ganglia, and of appendages, 

 are to be found at pp. 110, 116, 117 . . . . 106-119 



From the Class Annulata Proper. 

 Prep. 36. Specimen of Common Earthworm (Lumhricus 



terresfris) 119-121 



