SPIROSTEMMA. 



287 



No. 4. S. princeps. Length 7 times the diam. ; 24-25x3.5- 



3.7 mm., 11^-12 whorls; cylindric, with flat whorls 



and seam-like suture; brown; keel very strong; last 



whorl well projecting. Interior of western Portland. 

 No. 5. S. carinata. Length 5% times diam. ; 22 x 4 mm., 



whorls 12 ; fleshy-fulvous ; last whorl shortly free. 

 No. 6. S. inusitata. Length nearly 6 times the diam. ; 17-18 



x 3-3.1 mm., with 11-12 whorls ; reddish or pale brown ; 



widest at or below the middle ; aperture free in front. 



Western Portland. 

 No. 7. S. ipswichensis. Length from 5 to 6 times the diam. ; 



13-15.7x2.3-2.7 mm., whorls 10y 3 -12; red-brown or 



pinkish. Ipswich, St. Elizabeth. 

 No. 8. 8. rubra. Length 5% times the diam.; 20.5x3.75 



mm. ; deep red ; greatest diam. at or above the middle. 

 No. 9. S. cognata. Length 5 times the diam. ; 15 x 3 mm. ; 



whorls 11-12; pale brown; widest below the middle; 



last whorl free and descending in front; aperture 



very oblique. St. Andrew, in the mountains. 

 No. 10. S. similis. Length 5 times the diam. ; 12 x 2.3 mm. ; 



pale brown ; last whorl quite shortly free, 

 lo. 11. S. intermedia. Length 13 mm. ; whorls 11 ; brown ; 



aperture shortly free. 



1. S. DUNKERI (Pfeiffer). PI. 36, figs. 62-65; 67-75. 



Shell cylindric or pillar-shaped, slightly and slowly taper- 

 ing above, brown or dark reddish-brown. Surface nearly 

 lusterless, sculptured with oblique, slightly arcuate riblets, 

 which are about half as wide as their intervals. Whorls about 

 12, but slightly convex, the last strongly carinate below, 

 noticeably concave above the keel, very shortly or not free in 

 front. Aperture very oblique, inverted ovate, being angular 

 below with a corresponding gutter within. Peristome obtuse, 

 narrowly reflexed, continuous, free above or against the pre- 

 ceding whorl. Internal axis strongly spiral in the last whorl 

 only, nearly straight in the others (fig. 67). 



Length 19.5, diam. 3.2 mm.; whorls Iiy 2 (Bogwalk). 



Length 20, diam. 2.9 mm.; whorls 121/2 (Stanmore). 



