CLASSIFICATION OF OLEACINIIXE. 



minal sack (p. s.) is very short and wide. The large ovate 

 appendix is situated beyond the middle of the penis. The re- 

 tractor muscle (r. p.) is inserted on the epiphallus, which is 

 dilated at the end, and bears a small accessory sack (pi. 35, 

 fig. 8). 



In 0. orysacea (Orb.), from Trinidad, Cuba, (pi. 35, fig. 

 9), the penis is stouter, with a much longer terminal sack 

 (p. s.), and an oblong appendix (app.}. The basal part of 

 the epiphallus is partially enveloped in the penis-retractor 

 muscle, some part of which reaches the apex of the penis. 

 The spermatheca has a long duct. 



In the Haitian 0. miilleri from Charmettes, the penis (p.) 

 is swollen distally and the appendix (app.) is very long and 

 flagelliform (pi. 35, fig. 10). I could not ascertain whether 

 there is a terminal sack as in Cuban species, the single speci- 

 men available having been broken in extracting from the 

 shell. The spermatheca is ovate on a very long duct. 



The peculiar appendix probably indicates that the Haitian 

 forms should be separated from the Cuban as a distinct sec- 

 tion of Oleacina, which may be called Flavoleacina, 0. miil- 

 leri being the type. 



The pharynx is very large, cylindrical and long in all the 

 species examined, 18 mm. long in 0. o. straminea. 



The radula is comparatively large, as in most Oleacinidce, 

 13 to 14 mm. long in 0. o. straminea, 4 to 5 mm. in 0. orysacea 

 and O. solidula. The transverse rows of teeth are v-shaped, 

 the sides meeting at an angle of about 90 degrees. In 

 0. o. straminea the angle is slightly less, in orysacea and 

 miilleri a little greater. The teeth show a good deal of di- 

 versity in the few species examined. 0. o. straminea (pi. 36, 

 figs. 17, 18, 14, 15) has 29,1,27 to 30,1,30 teeth in three 

 radulse examined. There are about 92 transverse rows. 

 They are closely crowded, with long, rather weakly curved, 

 lanceolate cusps. Figures 17, 15 show the teeth in their 

 natural, crowded order ; in fig. 14 they are slightly spread and 

 pressed over on the side somewhat. The central tooth is nar- 

 row, its cusp nearly concealed by the much larger adjacent 

 laterals. The latter decrease regularly in size. Fig. 18 

 shows a group of median teeth much more enlarged. 



