204 THE CHICAGO ACADEMY OF SCIENCES. 



mal (anterior) end, where it narrows to receive the duct, which is 1.50 

 mill, in length; the retractors of the penis and penis-sac are subequal, 

 each being 1.00 mill, in length; they are very slender. 



Female organs: Receptaculum seminis very large, roundly pyri- 

 form, the duct 2.00 mill, long; free portion of oviduct short, very thick; 

 first accessory albuminiparous gland very large, ovate. 



A large specimen gave the following measurements i 1 



Penis- Prostate Rec. sem. Penis Penis-sac 



Penrs. sac. Vas. def. duct. duct, retractor, retractor. Shell. 



1.00 2.00 6.00 1.50 2.00 1.00 1.00 9.00 



RANGE: (Figure 15) South-central Colorado. So far as known 

 this species is confined to the Canadian life zone and the Coloradoan 

 and Upper Mississippian regions. It will probably be found in other 

 parts of Colorado. 



RECORDS. 



COLORADO: West Cliff, Custer Co. (Cockerell); Hot Sulphur Springs, 

 Grand Co. (G. S. Dodds; Henderson). 



GEOLOGICAL RANGE: Unknown. 



ECOLOGY : Not recorded. 



REMARKS : Doddsi may be distinguished from truncatula by its 

 generally less rounded zvhorls and aperture, and particularly by the 

 formation of the inner lip, which is raised and overhangs the umbilical 

 chink forming a broad, even expansion. In truncatula the inner lip 

 rolls over into the umbilical chink nearly closing the perforation while 

 in doddsi it is rolled upward leaving a distinct umbilical chink. 



This is the shell recorded by Prof. Cockerell as truncatula and 

 by Mr. Henderson as humilis. It bears a strong resemblance, when 

 young, to juvenile specimens of Galba cubensis aspirans, but its smaller 

 size, more turreted spire and rounder aperture will easily distinguish 

 it. There is some variation in the amount of compression of the inner 

 lip. It may be distinguished from parva by its narrower body whorl 

 and wider columellar expansion, which is not as erect as in parva. 



It is named in honor of Mr. G. S. Dodds, who collected the type 

 specimens. 



Galba cubensis (Pfeiffer). Plate XXVII, figures 9-16. 



Limna>a cubensis PFEIFFER, in Wiegm. Arch., I, p. 354, 1839. HJAL. and 

 PFR., Mal. Blatt., V, p. 135, 1858. PFEIFFER, Mal. Blatt., V, p. 154, 1858. 

 ARANGO, in Poey, Rep. Fisico. Nat. Cuba, I, p. 137, 1865. PRESAS, in Poey, 

 Rep. Fisico. Nat. Cuba, I, p. 264, 1865. POEY, Rep. Fisico. Nat. Cuba, II, 

 p. 270, 1866. ARANGO, in Poey, Rep. Fisico. Nat. Cuba, II, p. 87, 1866. 

 SOWERBY, Conch. Icon., XVIII, Limn, sp., 48, pi. 8, fig. 48, a, t>, 1872 (figures 

 not good). STREBEL, Natur. Ver., Hamburg, VI, p. 58, taf. 4, fig. 33, 1873. 

 MARTENS, Jahrb. IV, p. 353, 1877. CLESSIN, Mal. Blatt., N. S., I, p. 27, 1879 



iDissection No. 23939. 



