HOLOSPIRA. 71 



tremely long, the albumen gland small, lying in the volution 

 anterior to that containing the stomach (in H. roemeri) . The 

 ovisperm duct is strongly convoluted but not knotted in ap- 

 pearance. The spermatheca is small and ovate, on a duct as 

 long as the oviduct. This duct is simple in H. goldfussi, dalli 

 and roemeri, but certainly bears a long diverticulum in H. nel- 

 soni (pi. 27, fig. 33). 



The free retractor muscles are excessively long, attached 

 proximally to the axis at about the junction of the cone with 

 the cylindrical portion of the shell. In H. roemeri (pi. 27, 

 fig. 43, x 5) the left ocular retractor unites with the pharyn- 

 geal retractor at about the posterior third of the length of the 

 latter. This band then unites with the columellar muscle near 

 its posterior insertion. The right eye-retractor unites with 

 the columellar muscle at about the anterior third of the length 

 of the latter. Both ocular retractors give off some short ante- 

 rior pedal branches distally. The pharyngeal retractor is not 

 split at its distal insertion. 



In H. goldfussi Strebel found a somewhat different ar- 

 rangement (pi. 19, fig. 53). The columellar and pharyngeal 

 bands are united for a greater distance posteriorly, and the 

 latter divides into four branches at about the same place: 

 right and left ocular, pharyngeal, and a median band inserted 

 in the integument below the mouth. This differs so radically 

 from the condition found in H. roemeri that it may be due to 

 an error of observation, the more likely because Strebel worked 

 from dried specimens which he soaked up. 



Key to Subgenera and Sections of Holospira. 

 I. Internal column with a spiral lamella within the penulti- 

 mate whorl, sometimes with parietal, basal and peri- 

 pheral lamellae also. Whorls 11 to 17. 



Sub genus HOLOSPIRA s. str. 



a. Cavity of the penultimate whorl obstructed by four 

 lamellag, axial, parietal, basal and peripheral, the 

 last sometimes wanting. 



Sect. Holospira, species 1-6. 



b. Penult, whorl with a short axial and a parietal 

 lamella only. Sect. Eudistemma, sp. no. 7. 



