THE NEW EVOLUTION f^'^ 



Fig. 46. — A pelagic mollusk (^Atalanta, sp.). From A. Agassiz. 

 Fig. 47. — A curious dark blue mollusk (Glaucus^ sp.) common on 



the surface of the Gulf Stream. From A. Agassiz. 

 Fig. 48. — A pteropod (Styliola, sp.). From A. Agassiz. 

 Fig. 49. — A shipworm (Teredo tiavalis). From Caiman. 

 Fig. 50. — A pelagic mollusk Qjatithina, sp.) very common on the 



surface of Gulf Stream. From A. Agassiz. 

 Fig. 51. — A gastropod or snail-like mollusk (Thais lamellosd). 



From Dall. 

 Fig. 52.. — A bivalve mollusk or pelecypod. A fresh water clam 



(Lampsilis salinasensis) from Mexico. From Dall. 

 Fig. 53. — A foraminiferan (Biloculina tenera) with the pseudo- 

 podia extended. From A. Agassiz, after Schultze. 

 Fig. 54. — A planarian (Planaria polychroa) with the pharynx, 



bearing the mouth at the end, extended. From 



Sedgwick. 

 Fig. 5 5 . — The liver fluke (Dhfomum bepaticum). From Sedgwick, 



after Sommer. 



Various Types of Animal Life (Page hi) 



Fig. 56. — An appendicularian. From A. Agassiz. 



Fig. 57. — A free-swimming tunicate (Doliolufjz). From A. 



Agassiz. 

 Fig. 5 8.' — ^The solitary form of a salp (Salpa cahoti). From A. 



Agassiz. 

 Fig. 59. — A pyrosoma — a colony of closely packed tunicates 



forming a hollow cylinder. From A. Agassiz. 

 Fig. 60. — A brachiopod or lamp-shell (Terebratula cubensis). From 



A. Agassiz. 

 Fig. 61. — A cephalodiscid (Cephalodiscus dodecalophus). From the 



Challenger reports. 

 Fig. 6i. — An arrow-worm or ch^tognath (Sagitta, sp.). From 



A. Agassiz. 

 Fig. 63. — A cephalodiscid (Rhabdopleura mrmanf). From Lan- 



kester. 

 Fig. 64. — A free-living or pelagic copepod. These creatures are 



of immense importance. From A. Agassiz. 

 Fig. 65. — An annelid or jointed worm that lives floating freely 



at or near the surface of the sea (Tomopteris, sp.). 



From A. Agassiz. 



