AET. 22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD 63 



DENTALIUM, species (2 species?) 



Figs. 1,9. Conns miiUiliratus icalli, new subspecies. Fig. 9, type; alt. 21 mm.; 



There are a number of fragments of the genus Dentalium from 

 station 8302, one mile south of Brasso, that may represent one or two 

 new species. They all belong to the group having an early hexa- 

 gonal shell. They indicate a rather slender and nearly straight 

 shell, the posterior extremity being more curved than the later part. 

 Irregular, spiral swellings give the shell an undulated appearance. 

 An interaxial appears early on the shell between the six primary 

 ones; soon other interaxials come in rounding out the surface in 

 ascending. 



The forms are apparently related to Dentalium gabhi Pilsbry and 

 Sharp from Santo Domingo. A very similar form occurs at station 

 6033-<?, Canal Zone, a horizon assigned to the Gatun formation. 



EXPLANATION OF PLATES 



Plate 1 



Figs. 1,4. Conus trinitatensis, new species; type; alt. 20 mm. ; page 12. 



2. Drilliu pennyi acaria, new subspecies ; type ; alt. 5.2 mm. ; page 18. 

 3, 6. Conus spring valeensis, new species ; type ; alt. 27.0 mm. ; page 11. 



5. Terehra ( Strioterebra ) brassoensis, new speceies ; type ; alt. 6.2 ; 



page 10. 

 7,9. CylichneUa ovum-Jaccrtl (Guppy) ; figured cotype ; alt. 3.3 mm.; 

 page 9. 

 8. Terebra (Htrioterebra) trinitatensis, new species; type; alt. 9 mm.; 

 page 10. 



Plate 2 



Figs. 1, 9. Conus multilratus nalli, new subspecies. Fig. 9, type; alt. 21 mm.; 



Fig. 1, specimen from same station as type ; alt. 16 mm. ; page 13. 



2. Turricula springvaleensis, new species; type; alt. 44 mm.; page 13. 



3, 4. Drillia propefusiformis, new species. Fig. 3, type ; alt. 34 mm. ; 



fig. 4, specimen from same station as type ; alt. 13 mm. ; page 20. 



5, 10. Conus niansanillacnsis, new species ; type ; alt. 40 mm. ; page 12. 



6. Drillia manzanillaensis, new species ; type ; alt. 13 mm. page 23. 



7, 8. Turris brassoensis, new species ; cotype. Fig. 8, alt. 16 mm. ; page 14. 



11. Typhis saickinsi, new species ; type ; alt. 15 mm. ;' page 48. 



12. Cancellaria springvalecnsis, new species; type; alt. 21 mm.; page 31. 



Plate 3 



Figs. 1, 5. Drillia daditrina, new species. Fig. 1, tyi>e; alt. 8.4 mm.; fig. 5, 

 specimen from same station as type ; alt. 10 mm. ; page 19. 



2. Drillia pennyi, new species ; type ; alt. 9.3 mm. ; page 17. 



3. Drillia nitrina, new species ; type ; alt. 6.5 mm. ; page 22. 



4, 9. Drillia inniadda, new species; cotypes. Fig. 4, alt. 9 mm.; fig. 9, 

 alt. 6 mm. ; page 21. 



6. Drillia inadrina, new species ; type ; alt, 6.6 mm. ; page 22. 



7. Mangilia micropleura Guppy. Figured specimen of largest cotype ; 



alt. 6 mm. ; page 25. 



