Ixvi SIMPULOPSIS. 



Group of 0. atramentarius. 



O. powisianus Pet., xii, 206. O. atramentarius Pf'r., xii, 209. 

 O. adamsoni Gray, xii, 207. boussingaultii Hupe. 



f. maculatus Pils., xii, 208. iodes Shuttl. 



O. approximatus Fult., xii, 209. 



Subfamily AMPHIBULIMIN^E. 



Manual xii, p. 211. This group includes Bulimulidse in which the 

 shell is more or less degenerate, Succinea-s\\&ped, Haliotis -shaped, or 

 in the less modified forms, globose or ovate ; always thin and mainly 

 cuticular. 



The group is a provisional one in its present limits, and probably 

 composed of two independent lines of specialization : one from the 

 Drymceus, Zaplagius, Oxychona radical, leading to Simpulopsis and 

 Peltella ; the other perhaps diverging from a Bulimulus-Yike stem, 

 including Amphibulima with its satellite groups, and Gceotis. 



Genus SIMPULOPSIS Beck, 1837. 

 Manual xii, p. 212. 



The jaw is unknown, but probably like that of Drymceus. The 

 radula of S. sulculosa has V-shaped rows of 70 teeth each, obliquely 

 running forward, as in Zaplagius and the Orthalicinse, The rhachi- 

 dian tooth has a single conic cusp. The laterals have the mesocone 

 much expanded, broad, ectocone small but well developed. The 

 marginal teeth (fig. 12) resemble those of Drymceus and Peltella, 

 having an oblique, trifid, broad cusp, the ectocone split (pi. 62, fig. 

 34, S. sulculosa, after Heynemann). The soft anatomy is other- 

 wise unknown. 



The species of the typical section are from Brazil, south of the 

 Amazon, except corrugata from Trinidad and vincentina from St. 

 Yincent. 



S. atrovirens Moric., xii, 213. S. rufovirens Moric., xii, 216. 

 S. sulculosa Fer., xii, 214. rufescens H. & A. Ad. 



membranacea Mich. S. corrugata Gupp., xii, 217. 



S. brasiliensis Moric., xii, 215. S. miersi Pfr., xii, 218. 



obtusa Pfr. S. tryoni Pils., xii, 218. 



S. obtusa Sowb., xii, 216. S. decussata Pfr., xii, 218. 



ovata Sowb. S. (?) vincentina Sm., xii, 219. 



