BULIMULUS. XXVli 



This group of forms inhabits temperate and tropical South Amer- 

 ica, the Antilles and southern Mexico. The shell is ovate, less varied 

 in form than in the preceding and following divisions. 



Subgenus PLECTOSTYLUS Beck, 1837. 



Manual xi, p. 2. In B. chilensis Semper found two small, widely 

 separated body-lobes on the left margin of the mantle. The kidney 

 is of the usual short, triangular form; genitalia simple, the penis with 

 terminal retractor, spermatheca lying near the heart, on a long duct. 

 The jaw is broad, strongly but irregularly ribbed. Radula with at 

 least 101 teeth in a transverse row, the central tooth with short 

 middle and obsolete side cusps, inner 14 laterals bicuspid, the inner 

 cusp then appearing. Binney, who examined the same species, 

 agrees as to the teeth. The rather strong development of the inner 

 cusp gives the marginal teeth a strong resemblance to those of 

 Drymcevs. Type B. peruvianus. Almost wholly a group of the 

 Chilian coastal region. 



B. coturnix Sowb., xi, 3. B. chilensis Less., xi, 8. 



B. broderipii Sowb., xi, 4. Achatina chiliensis Less. 



v. elongatus Orb., xiv, 140. B. granulosus Pot. & Mich. 



B. buschii Pfr., xi, 5. B. graniger Beck. 



B. variegatus Pfr., xi, 5. B. aldunatea Hupe. 



rupicolus Rve. Partula flavescens King. 



B. moestai Dkr., xi, 6. B. reflexus Pfr., xi, 9. 



B. peruvianus Brug., xi, 7. B. ochsenii Dkr., xi, 10. 



corrugatus King. arbustorum Phil. 



gravesi King. B. coquimbensis Brod., xi, 10. 



B. punctulifer Sowb., xi, 317. v. perelegans Pils., xi, 11. 



B. prolatus Gld., xi, 318. elegans Pfr. 



B. filaris Pfr., xi, 316. 

 hilarus H. & A. Ad. 



Subgenus SCUTALUS Alb. 



Man. Conch, xi, p. 12. 



The genital system in B. proteiformis, proteus and versicolor is 

 simple, the penis and spermatheca duct long (pi. 52, fig. 29, B. ver- 

 sicolor, after Strebel). The jaw is strong, arcuate, with rather wide 

 plaits, not imbricating (pi. 59, fig. 5, B. proteus, after Strebel). 

 Radula with 90 to 96 teeth in a transverse row in B. proteiformis, 



