56 THE NAUTILUS. 



Length 27.5, breadth 11.5, aperture length 12.5, breadth 6.0 mm. 

 Length 29.01, breadth 11.25, aperture length 13, breadth 6.0 mm. 

 Length 25.5, breadth 10, aperture length 11.5, breadth 6.0 mm. 

 Length 23, breadth 9, aperture length 9.5, breadth 4.75 mm. 

 Length 20, breadth 10, aperture length 10.5, breadth 5.5 mm. 



Types : Chicago Academy of Sciences, L. E. Daniels; cotypes, 

 Academy of Natural Sciences, Philadelphia; State Museum, Indian- 

 apolis, Ind. 



Range : Lake Maxinkukee, Indiana, collected by Mr. L. E. 

 Daniels. 



This distinct species may be known by its acutely pyramidal spire 

 and small, flaring aperture. It somewhat resembles elongate forms 

 of stagnalis. Some time ago Mr. Daniels sent six specimens of this 

 Lymncea for identification. It remained unnamed until a recent 

 visit to Washington, when a large collection of the same form was 

 seen which had been secured by Dr. Paul Bartsch, of the Smithson- 

 ian Institution, and its novelty was thereby established. Later, 

 Mr. Daniels sent several hundred specimens for examination. Lake 

 Maxinkukee also contains Lymncea palustris, desidiosa and parva. 

 The juvenile palustris are liable to be mixed with danielsi if care is 

 not taken to observe the form of the shell particularly the form of 

 the axis. 



The material collected by Dr. Bartsch contains one monstrosity in 

 which the aperture is entire and separated from the body whorl. 

 The lot recently sent by Mr. Daniels is wonderfully uniform, show- 

 ing that the species is quite stable. A few curious variations occur 

 in which the spire is shortened and the aperture is enlarged and ex- 

 panded. In some specimens the columella plait is exaggerated to 

 such an extent that it forms a pseudo-tooth. In other specimens the 

 lower part of the aperture is somewhat effuse. The variation in 

 color is remarkable, and it would be of interest to know the cause of 

 the rich chestnut and purple color. The normal form is horn-col- 

 ored like stagnalis. 



The species is named in honor of Mr. L. E. Daniels, of La Porte, 

 Indiana, whose assiduous collecting has added many new and inter- 

 esting shells to the fauna of the middle west. 



