140 MOLLUSCA. 



ganglia, each cerebral ganglion is connected with the corre- 

 sponding buccal and pedal ganglion and, through the pleural, 

 with the parietal ganglion. The parietal ganglia are con- 

 nected with each other by a long commissure on which the 

 visceral ganglion is placed. Each pedal ganglion receives con- 

 nectives from the cerebral and from the pleural ganglion of the 

 corresponding side. 



Draw figures of the nervous system and compare them with 

 the clay model. ^ 



Colton: How Fulgur and Sycotypus Eat Oysters, Mussels, and Clams. 



Proc. Acad. Nat. Sci., Philadelphia, 1908. 

 ConkUn : The Embryology of Fulgur : A Study of the Influence of Yolk on 



Development. Proc. Acad. Nat. Sci., Philadelphia, 1907. 



: The Embryology of Crepidula. Jour. Morph., 13, 1897. 



Copeland: The Olfactory Reactions and Organs of the Marine Snails, Alec- 



trion obsoleta and Busycon canaHculatum. Jour. Exp. Zool., 25, 



1918. 

 : Locomotion in Two Species of the Gasteropod Genus Alectrion with 



Observations on the Behavior of Pedal Cilia. Biol. Bui., 37, 1919. 

 Crozier: On the Use of the Foot in Some MoUusks. Jour. Exp. Zool., 27, 



1919. 

 Dakin: Buccinum. Liverpool Marine Biol. Com. Memoir No. 20, 



1912. 

 Glaser: Uber den Kannibalismus bei Fasciolaria tulipa (var. distans) und 



deren larvale Excretionsorgane. Zeit. f. wdss. Zool., 80, 1905. 

 Herrick: Mechanism of the Odontophoral Apparatus in Sycotypus canal- 



iculatus. Am. Nat., 40, 1906. 

 Olmstead: Notes on the Locomotion of Certain Bermudian MoUusks. 



Jour. Exp. Zool., 24, 1917. 

 Orton: An Account of the Natural History of the Slipper-Limpet (Crepi- 

 dula fornicata). Jour. Marine Biol. Ass., 9, 1912. 

 Parker: The Mechanism of Locomotion in Gastropods. Jour. Morph., 



22, 1911. 

 Patten: The Embryology of Patella. Arb. Zool. Inst. Wien, 6, 1886. 



CEPHALOPODA. 



LOLIGO PEALEU. (The Squid.) 



Specimens of this or closely related species are rather common 

 along the Atlantic coast of the United States. They are active 

 swimmers, but may occasionally be seen in shallow, quiet water 



^ Instructors will find that a model prepared by sticking lumps and 

 strands of modeling clay on a cylindrical gi'aduate to illustrate the positions 

 of the gangUa and connectives on the esophagus will greatly aid the 

 students. ^ 



