XVlll CONTENTS OF 



animal series. — Ideal and derivative types. — Relations of or- 

 ganised beings to one another. — General ideal type of a perfect 

 animal. — Division of physiological labour. — Higher and lower 

 animals : organic permanence of the former ; organic variability 

 of the latter. — Subdivision of the Articulata. — True Annelids or 

 Worms. — Tubiculous Annelids ; Chlorcema; Amphicora; Tere- 

 bella ; Sabella. — Errant Annelids ; Chsetopterus ; Echiurus ; 



Sipunculus ; Dujardinia. — Anatomy of Eunice sanguinea 



Doyerina ; Aphlebina. — Organisation of Nemertes ; remarkable 

 simplification. — Excursion to the lighthouse of Hehaux. — Descrip- 

 tion of the tower. — Illuminating apparatus. — Historical Notices : 

 Borda, Lemoine, Bufibn, Arago, Fresnel, the younger Francois. — 

 Departure from Brehat - - - - Page 66 



CHAP. III. 



THE COASTS OF SICILY. 

 THE GROTTO OF SAN-CIRO. — TORRE DELL' ISOLA. 



Departure for Naples with MM. Milne Edwards and Blanchard. — 

 Arrival in Sicily ; aspect of the Bay of Palermo. — Excursions to 

 the grotto of San-Ciro. — Osseous caverns ; osseous breccias. — 

 Installation on board the Santa Rosalie. — Departure from 

 Palermo. — The grottoes of Mont Pellegrino. — The Blatta 

 orientalis. — Arrival at Torre dell' Isola. — The Padre Antoniuo. — 

 Structure of the coast. — Our sailors. — Explorations. — Trans- 

 parence of the water in the bay. — Principal species belonging 

 to the littoral districts. — Causeways built by the Vermetus. — 

 Occupations ; mode of life. — Departure for Castellamare - 141 



CHAP. IV. 



THE COASTS OF SICILY. 

 THE GULF OF CASTELLAMARE — SANTO VITO, 



General aspect of the Gulf. — Formation of clouds in a clear sky. — 

 Castellamare. — Excursion to the ruins of Segesta. — Departure 



., for Santo- Vito. — Misadventures there. — Ants. — Researches of 

 M. Edwards on the Acalephse, Bero'idse, and Stephanomise. — My 

 observations on the mode of reproduction of the Syllis. — Repro- 

 duction of the Medusae. — Curious approximation between the 



