70 



University of California Publications. [Geology 



LIMNAEA MAXIMA nom. prov. 

 Fig. 1. 



Type specimen No. 10002. Univ. Calif. Col. Invert. Palae., Maseall beds, 

 three-quarters of a mile east of Belshaw 's ranch, John Day Valley. 



Partially exposed in portions of a fine compressed sediment of 

 lacustrine origin are several casts of a very large Limnaea, sug- 

 gestive in a general way of the circumboreal L. stagnalis, but so 

 much distorted as to preclude a more definite description. For 

 convenience this may be known provisionally as L. maxima. 



INDETEEMINATE FOEM. 



In addition to the species herein described, the material sub- 

 mitted to me by Professor Merriam included a small globose form 

 about the size of a small pea ; there are several examples, so dis- 

 guised by adherent particles of matrix as to make it doubtful 

 whether they belong to terrestrial or aquatic groups, with a pre- 

 sumption in favor of the former. 



Issued December 6, 1906. 



