THE NAUTILUS. 

 A NEW SPECIES OF MUSCULIUM. 



BY V. STERKl. 



MnSCULIUM PUSILLUM n. 8p. 



Mussel small, subequipartite, moderately inflated, rather rounded 

 in outlines to subtruncate anteriorly and posteriorly ; beaks very little 

 anterior and little inclined towards the anterior, somewhat project- 

 ing, calyculate, made up wholly of the nepionic valves marked off 

 from the post-embryonal by a deep constriction ; concentric surface 

 striae microscopic, slight, somewhat distant, irregular, most marked 

 and more crowded over tlie widest part of the beaks ; color (of dead 

 shells) whitish to straw, surface somewhat shining ; shell very thin 

 and fragile ; hinge very slight but well formed, right cardinal tooth 

 moderately curved with its posterior end thicker to even hooked, 

 left anterior slightly curved, posterior very short, oblique. Long. 4, 

 alt. 3.G, diam. 2.4 mill. 



Soft parts not seen. 



Hab. : Hancock Creek, Dickinson Co., Michigan (Upper Penin- 

 sula), collected by an expedition of the Geol. and Nat. Hist. Survey 

 of Michigan, in 1909. Types in the museum of the Univ. of Mich. 

 (No. 193 of the expedition's collecting), and in the Carnegie Museum 

 (5459 of my collection of Sphariidce). 



There were about a dozen specimens, all dead shells, most of them 

 single valves and partly broken. Most of them were nearly of the 

 same size, a few smaller (3.3 and 3.4 mm. long). They may not be 

 full grown, but even as such they are decidedly different from im- 

 mature specimens of all Musculia described. As to color, surface 

 appearance and thinness of the shell, they somewhat resemble M, 

 ryckholti Normand, but are less inequipartite, less oblique, less high, 

 less inflated, and evidently smaller. 



A6BI0LIMAX A6BESTIS LINN. AT WACO, TEXAS. 



BY JOHN K. STRECKER, JR. 



In the early portion of February, 1909, the writer, in company 

 rith Mr. Ed. Ainsworth, city editor of the Waco Times- Herald, tIs- 



