172 PROCEEDIXGS OF THE ACADEMY OF [1899. 



List of the species arranged in two sections, as they have not or 



have spiral sculpture ; subsections, as the ribs are absent 



or j)re.se?i^ 07i the base; and again divided by 



the character of the spirals. 



1.— NO SPIRAL SCULPTURE. 



A. — Transverse ribs ending at periphery of l)ody- whorl; ribs 

 clearly defined = Turhonilla restricted. — Type. T. lactea (Linne) 

 = T. elegantissima (Montagu). 

 T. kymatoessa Watson — whorls 6 + the oblique, flattened nucleus; 



ribs 14. L. .12 X w. .038 inch. Deep Avater. 

 T. modesta (d'Orbigny), 1853 — not 0. modesta Stimpson, 1851 



— wh. 7 with the transverse nucleus ; ribs about 16. 2 X -| 



mm. 

 T. Beilprini Bush — Avh. 8 + the slightly oblique, flattened nucleus ; 



ribs about 18. 2|^ X about f mm. 

 T. compsa Bush — wh. 8 + (nucleus wanting) ; ribs about 36. 3|- X 



about 1 mm. 

 T. leuca Bush — wh. 9 + the transverse, very projecting nucleus; 



ribs about 24. A^ X li mm. 

 T. inclinata Bush — wh. 9 + the transverse, very projecting nu- 

 cleus; ribs about 20. 3^ X i mm. 

 T. abrupta Bush — wh. 9 + the transverse, projecting nucleus; ribs 



about 20. 4X1 mm. 

 T. rhabdota Watson — wh. 9 + the oblique, projecting nucleus; ribs 



14. .18 X .04 inches. Deep water. 

 T. curta Dall — wh. 9-10 + the oblique, projecting nucleus; ribs 



about 25. 8.3 X 2.9 mm. Deep water. 

 T. levis C. B. Adams, 1850 — not 0. Iwvis Angas, 1867 — wh. 



9-10 + the very oblique nucleus; ribs 28-30. .165 X .04 inches. 

 T. (equalis (Say) — wh. 10 with the transverse, projecting nucleus; 



ribs 20-22. i inch or 4^ X 1^ mm. 

 T. pusilla C. B. Adams, 1850 — not T. pusilla Philippi, 1844, nor 



0. pusilla Jeffi-eys, 1869 and 1884 — wh. 10-11 + the very oblique 



nucleus; ribs 12. ,135 X .03 inches. (j= T. minor Bush). 

 T. Penistoni Bush — wh. 11 + the transverse, very projecting nu- 

 cleus ; ribs about 18. 4|^ X 1 mm. 

 T. pulchella (d'Orbigny), 1853— not 0. pulcheUa K. Ad., 1861— 



wh. 12, with slightly, oddly tilted nucleus; ribs about 18. 7-8 X 



1^ mm. 



