THE NAUTILUS. 



the latter it differs in its shorter dorsal line, more pointed posterior, 

 .red ligament and greater length. It has the outline of U. Genthii 

 Lea but it is darker, rayless and the teeth are heavier, the single 

 lateral being uniformly tapered off to its posterior end instead of 

 ending abruptly. Twelve specimens were taken along with U. 

 succisus (cacao) Lea, U. incrassatus Lea, var. boykinianus Lea and 

 neissleri Lea, var. 



We name it in honor of our esteemed friend, Dr. W. S. Strode, 

 of Lewiston, 111. 



U. cylindricus Say, var. strigillatus nov. 



The chief distinguishing characters of this variety are : Much 

 more compressed, sculptured throughout, and lateral teeth widely 

 diverging and curved downwards. The umbonal ridge is very low 

 nad broad, and fluted with elongated, divergent, flattened elevations. 

 Nacre usually pink. 



Habitat : Clinch River, Lee Co., Va. Type in National Museum. 



Remarks: A large number of these shells was received several 

 years ago from Mr. J. F. Sword, of Jonesville, Va., and sent out 

 under Mr. Say's name. Recently several young ones were found 

 which convinced me of their varietal value, indicating a connecting 

 link with U. tuberculatus Barnes. 



ISAAC LEA DEPARTMENT. 



[Conducted in the interest of the Isaac Lea Conchological Chapter of the Agassiz 

 Association by its General Secretary, Dr, W. S. Strode] . 



INTERGLACIAL SHELLS AT TORONTO, CANADA. 



[Extract from the report of James H. Lemon. From the Transactions of the Isaac 

 Lea Conchological Chapter for 1897.] 



The most interesting deposit from a Conchological standpoint is 

 found at Taylor's Quarry on the banks of the Don River, a mile 

 northeast of the city of Toronto. At this point a good section of 

 the Drift has been exposed. The underlying rocks are Hudson 

 River shales belonging to the Silurian period, rising about 30 feet 

 above the bed of the river. They are immediately covered by a 

 layer of till three feet thick, and which fills in all irregularities of 

 the underlying shale. The fossils are found in a few inches of clay 



