ODONTOSTOMIN.K. Hx 



gland or appendix, usually composed of several lobes in Oxystyla, 

 Liguus, PurpliyrobapJie and Metorthalicus, but reduced to an annular 

 swelling in Orthalicus. The penis is continued in an epiphallus to 

 which the retractor and vas deferens are attached distally. The 

 vagina is quite long, except in Porphyrobaphe. The small globose 

 or ovate spermatlieca lies near the heart, its duct being very long 

 except in Porphyrobapke, where the duct is much shorter than the 

 uterus. 



The kidney is small and triangular, as short as the pericardium, as 

 in all BidimulidcK. The lung is much lengthened, with a large, 

 straight pulmonary vein with only very small brandies. The peri- 

 cardial vein is small, and gives forward but one large branch. Only 

 the first, or right main branch of the anterior vena cava is well de- 

 veloped. The minor reticulation is confined to the intestinal side of 

 the lung, and the anterior extreme of the opposite side, between the 

 base of the first main branch of the vena cava and the end of the pul- 

 monary vein ; the rest of the cardiac side being free from visible 

 reticulation (pi. 53, fig. 34, Qxystylaundata jamaicemis). 



The free muscles resemble those of Bulimulus in general arrange- 

 ment. The pharyngeal retractor unites at its proximal end with the 

 left tentacular band, although both are free almost throughout. The 

 pedal retractors are strongly developed, branching from both the right 

 and left bands. The right tentacular retractor arises from the an- 

 terior face of the columellar muscle (pi. 54, fig. 36, Oxystyla undata 



* 



jamaicensis). 



The jaw (pi. GO, figs. 17, 18), is composed of a solid basal 

 layer upon which the wide, imbricating plates of the anterior face 

 are superposed. These plates seem to be free at their outer edges, 

 which converge below towards the median line, but they are covered 

 by a transparent outer layer, which is more or less costate vertically 

 in some forms. The edges of the ribs alone are visible, by trans- 

 mitted light, as in pi. 60, figs. 17, 18. The central plate may be either 

 triangular or irregularly pentagonal, with the point downward. 



The radula is very broad, with 170 to over 200 teeth in a trans- 

 verse row, the rows widely V-shaped. The teeth have square basal 

 plates, which in the median portion of the radula bear very broad, 

 rounded or truncate cusps, longer than the basal plates and project- 

 ing beyond it on the sides. This cusp is to be regarded as compound, 

 being composed of completely concrescent ento- meso- and ecto-cones 



