XV111 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, Buffou, Arago, Fresnel, the younger Francois. 

 Departure from Brehat - Page 66 



CHAP. III. 



THE COASTS OF SICILY. 

 THE GROTTO OF SAN-CIRO. TORRE DELL 5 IS OLA. 



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 Antonino. 

 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 - HI 



CHAP. IV. 



THE COASTS OF SICILY. 

 THE GULF OF CASTELLAMARE SANTO VlTO. 



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 Acalephae, Beroidae, and Stephanomise. My 

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

 duction of the Medusae. Curious approximation between the 



