108 THE NAUTILUS. 



NEW SPECIES OF PISIDIUM. 



BY V. STElUvI. 



PlSlDIUM LI.MATULUM, 11. sp. 



Mussel small, inequipartite, somewliat oblique, well inflated, 

 superior margin slightly curved, angle at the scutum projecting and 

 rather sharp, at the scutellum rounded ; supero-anterior slope dis- 

 tinct, almost straight, anterior end a rounded angle situated low ; 

 interior margin rather well curved, posterior truncate ; beak some- 

 what posterior, moderately large and projecting over the hinge mar- 

 gin, rounded or slightly flattened on top ; surface dull to somewhat 

 shining with subregular, crowded, sharp striae very fine over the 

 beaks, becoming coarser towards the margins; color pale horn in the 

 adult, straw to whitish in younger specimens ; shell rather thin ; 

 liinge comparatively stout, plate rather narrow ; cardinal teeth ; the 

 riglit slightly curved, its posterior end much thicker and grooved, 

 the left anterior slightly curved, the posterior oblique, long, more 

 pi-ojecling than the anterior; lateral teeth rather large, cusps pointed, 

 strongly rugose, and so are the grooves, the outer posterior in the 

 right valve comparatively long ; ligament moderately thick. 



Size: long. 3, alt. 2.5, diam. 2 mill. 



Habitat : Alabama : Calera, in the current of a creek, and pools 

 left on same ; Town Cretk at Moutevallo; spring creek at Ebenezer 

 Church, a spring branch in Big Wills Valley, six miles south of 

 Valley Head, all collected by Mr. Smith in 1904, and sent for ex- 

 amination by Mr. Bryant Walker. 



Pis. litnatuluin is related to P. punctatum Sterki, but considerably 

 larger, and like that minute Pisidium, ranges under tlie Rivulina 

 group. With a little care, it cannot be mistaken for any other 

 species; even half-grown examples are considerably different from P. 

 punctatum. 



PUBLICATIONS RECEIVED. ' ! 



List of Shell-bkauing Moi.lusca of Frenchman's Bay, 

 Maine. By Dwiglit Blaney (Proc. Boston Soc. Nat. Hist., Vol. 

 32, no. 2, pp. 23-41). Tliis valuable list of 1.27 species and 5 varie- 

 ties collected during the summers of 1901-1904, shows what can be 

 done by careful and continuous work, and adds much to our knowl- 

 edge of the distribution of New England marine shells. C. W. J. 



