440 Annals of the Carnegie Museum. 



3. Musculium contractum (Prime). 

 Spharium contractum Prime, Mon. Corb., 1865, p. 48. 



Apparently near M. elevatum. 

 Habitat. — Alabama, Florida. 



4. Musculium hodgsoni (Sterki). 



CalycuUna hodgsoni Sterki, Nautilus, XVI, 1902, p. 91. 



Habitat. — Ohio, Illinois, Missouri, Kansas, Louisiana, Iowa (the 

 specimens from Iowa are different). 



5. Musculium transversum (Say). 



Cyclas transversa Say, New Harmony Disseminator, II, 1829, p. 356. 

 Spharium transversum Prime, Mon. Corb., 1865, p. 48. 



Sphariiim martensi Pilsbry, Proc. Acad. Nat. Sci. Philada., 1899, p. 401; I. c, 

 1903. P- 786, figs. 

 Habitat. — The continent to Mexico. 



6. Musculium transversum decisum forma nova. 



Mussel sharply truncate anteriorly and posteriorly in nearly straight 

 lines; apparently smaller and less inflated. 



Habitat. — Jackson, Alabama, in a pool near the Tombigbee River, 

 collected by H. H. Smith. Specimens are contained in the collection 

 of Mr. Bryant Walker, and are represented in the Carnegie Museum 

 by No. 5164. 



7. Musculium subtransversum (Prime). 



Sphcgrium subtransversum Prime, Proc. Zool. .Soc. London, XXVIII, i860, p. 322. 

 Sphcerium subtransversum Pilsbry, Proc. Acad. Nat. Sci. Philada., 1903, p. 787, 

 Pi. LIII, figs. 6, 6a. 



Appears to be distinct, judging by the description and figures given 

 by Dr. Pilsbry and specimens. Specimens sent from Texas to collec- 

 tions under this name are M. transversum. 



Habitat. — Mexico. 



8. Musculium ferrissi (Sterki). 



CalycuUna ferrissil Sterki, Nautilus, XVI, 1902, p. 91. 



Habitat. — Oklahoma, Louisiana, Missouri, specimens from the latter 

 locality having a somewhat different form. 



9. Musculium novoleonis (Pilsbry). 



Sphcerium novoleonis Pilsbry, Proc. Acad. Nat. Sci. Philada., 1903, p. 787, PI. LIII, 

 figs. 5, 5a; PL LIV, fig. 6. 



Habitat. — Mexico. 



