By Props. KOESCHELT and HEIDEE. 



TEXT-BOOK OF THE 

 EMBRYOLOGY OF INVERTEBRATES. 



Vol. I. — Porifera, Cnidaria, Ctenophora, Vermes, Enteropneusta, 

 Echinodermata. 15s. 



Vol. II. — Phoronidea, Bryozoa, Ectoprocta, Brachiopoda, 

 Eutoprocta, Crustacea, Palaeostrica. 12s. 



Vol. III. — Arachnida, Pentastomidae, Pantopoda, Tardigrada, 

 Onychophora, Myriopoda, Insecta. 14s. 



Vol. IV. 18s. 



