84 THE NAUTILUS. 



much behind the middle, prominent, rather narrow, more or less 

 flattened on top, with ridges or slight appendages ; surface with 

 rather crowded, sharp, regular striae, dullish ; color from light horn, 

 in the younger, to brownish ; light chestnut in adult specimens. 



Hab. : Shoal creek, Alabama (Hinkley). 



This form is mainly characterized by its beaks being less posterior 

 than in most others, and, as it seems, by its brownish color. 



The above are a lew of the more marked forms of the very poly- 

 morphous P. compressum Pr. More have been noticed, and some of 

 them will probably also have to be named and described ; besides, 

 more will be brought up with new materials. 



Pisidium fallax Sterki var. mite n. Rather smaller than the 

 typical form, beaks without appendages, or slightly flattened on top; 

 shell and hinge slighter. 



Hab. : Grand river, Michigan (Dr. Kirkland), Nimishillen creek, 

 Canton, Ohio (Sterki). 



Var. errans Sterki. Has been published as var. septentrionale 

 Sterki. (The NAUTILUS, XII., p. 78.) The name, being pre- 

 occupied, 1 had to be changed. This well-characterized Pisidium has 

 been seen from northern Maine, northern Michigan, Minnesota and 

 Keewatin. (Mclnnes Col., Whiteaves sent.) 



Pisidium punctatum Sterki var. armatum n. Higher, and often 

 larger, than the typical form, beaks very prominent, with strong 

 appendages, which give the mussel quite a different shape and 

 appearance. 



Hab. : Tuscarawas river, Ohio (Sterki), and other places. 



Var. simplex n. Beaks without appendages, rounded or slightly 

 flattened on top ; striation slighter ; mussel sometimes smaller than 

 the typical form. 



Hab. : Joliet, Illinois (Ferriss, Handwerk), Carp Lake near 

 Mackinaw, Michigan (Walker), Fox River, Wisconsin (Marston). 



(To be continued.) 



GENERAL NOTES. 



MASSACHUSETTS SLUGS. 1 am indebted to Mr. John Ritchie, 

 Jr., for two lots of slugs collected in the vicinity of Boston. The 

 first lot included Avion subfl/scus, Draparnand, of the form called 

 cinereo-fuscus, Drap., and Limax maxinnts, L., of three forms, the 

 first nearly typical, the second var. obscurus, Moquin-Tandon, and 

 the third var. ceHarius, Moquin-Tandon. A series received to-day, 

 collected by Mr. Abner Hatfield at Jamaica Plain, includes A. sub- 

 fuscus, v. cinereo-fuscus, L. maximus and Ayriolimax agrestis. The 

 A. agrestis unfortunately are dead and somewhat spoiled, but they 

 are of the dark and reddish forms, not the very pale kinds so com- 

 mon in England. I was glad to confirm the Boston Arion as A. sub- 



fuSCUS. T. D. A. COCKERELL. 



1 T. Prime, Cat. of 1895, " undescribed." 



