588 PROCEEDINGS OF THE ACADEMY OF [Dec, 



21. Labium thin, reflexed into the cavity of the penultimate 



whorl and appressed thereto; labrum slightly re- 

 flexed above, spreading widely and reflexed below. 

 Ribs strong, flattened on forward side and obsolete 

 on the anterior half of the last whorl; size, 13x4.7 

 mm expansa C. B. Ad. 



22. Labium produced below; linguiform part of labrum 



much produced, subacute; 40 ribs per whorl; size, 

 14 x 3.3 mm gracilis C. B. Ad. 



23. Linguiform part of labrum excessively produced obliquely 



and narrow; size, 13 x 4.7 mm. affinis C. B. Ad. 



24. Linguiform part excessively produced obliquely and 



acute at the lower part of the right side; size, 10 x 2.3 



mm. conica C. B. Ad. 



aa. Length of shell less than 10 mm. 



c. Labium separated from the penultimate whorl. 



25. Whorls remaining, 7 or 8; linguiform part of labrum 



but slightly produced; ribs 25 per whorl, broad, 

 obtuse; size, 5.3 x 1.2 mm jtaiiyerata C. B. Ad. 



26. Labium thickened and slightly separated from the 



penultimate whorl; labrum well expanded, thin, 

 reflexed; linguiform part moderately produced 

 obliquely at the side, obtuse; ribs 33-35 per 



whorl; size, 6.3 x 2.2 mm hilliana C. B. Ad. 



cc. Labium not separated from the penultimate whorl. 



27. Appears smooth until the lens is used, then covered 



with rounded, close-set, transverse ribs; labrum 

 produced on the right, labium appressed to the 

 penultimate whorl at the upper half and separated 

 from the labrum by a slight sinus; size, 9.1 x 2 

 mm. inornata Chitty. 



28. Labrum produced obliquely forward, rounded at the 



apex and reflexed; ribs 30 per whorl, coarse; 

 size, 8 x 2.7 mm vicina 0. B. Ad. 



29. Labrum thin, slightly reflexed; linguiform part ob- 



tuse, moderately produced laterally at the lower 

 part of the right side; labium a little thickened 

 and reflexed; 28 small, obtuse ribs, which, on the 

 last whorl, terminate a little below the periphery; 

 remaining whorls 7 or 8; size, 8.1 x 2.2 mm., 



pyramidatus C. B. Ad. 



Explanation of Plate XLIII. 



Figs. 1-5. — Sagda adamsiana n. sp. 



Fig. 6. — Sagda adamsiana n. sp., showing interior of last whorl from above. 



Fig. 7. — Sagda adamsiana n. sp., half-grown specimen. 



Figs. 8, 9, 11, 12.— Sagda jayana C. B. Ad. 



Fig. 10. — Sagda jayana C. B. Ad., showing interior of last whorl from above. 



Figs. 13, 14. — Sagda montegoensis n. sp. 



Figs. 15, 16. — Pleurodonte acuta semperfluens n. subsp. 



