CALL ON NEW MOLLUSCA. 3 



3 + 1+3 



34-23-7 7-23-34. 



1 + 1 



"The apparent articulation of the intermediate teeth, as described 

 above, was observed in a fragment of an odontophore which presented 

 a lateral aspect under the microscope. It is not known that this feat- 

 ure has ever been noted in any other species, although it very proba- 

 bly occurs in many which have foraminated or bullate teeth. This 

 disposition of the teeth would allow great flexion of the odontophore 

 without their displacement." 



Fir,, i. — Lingual dentition of Amnicola dalli. Call x 400. — Beecher. 



a. — Two of the transverse rows of the odontophore, showing the normal position of the teeth. 

 The teeth are considered as opaque. 



Analysis: b. — Outer laterals, c— First laterals, d. — Intermediate teeth, e. — Rachidian 

 teeth. 



Fig. 2. — Intermediate teeth (X400), showing mode of articulation. — Beecher. 



