THE NAUTILUS. 
Ol 
ol 
much slenderer and somewhat longer, the posterior cardinal tooth 
in right valve split by a sulcus much broader than the space be¬ 
tween the posterior and the next adjacent cardinal tooth. Valves 
orbicular, very convex, lightly wrinkle-striate, and covered with a 
black cuticle. Posterior slope depressed, with a radiating wide and 
shallow furrow, rendering the margin slightly emarginate. Dorsal, 
anterior and basal margins well rounded ; posterior margin obliquely 
subtruncate. Length 86, breadth 77, diam. 49 mm. 
Yaeyama I., Loo Choo group. A single specimen (Frederick 
Stearns). 
Siphonalia Stearnsii n. sp. 
Shell fusiform, solid, brownish ; spire conical, shorter than the 
aperture, consisting of 8 convex whorls, which are finely spirally 
lirate, and closely and strongly plicate ; plicae becoming partly or 
wholly obsolete on the body-whorl, which is very indistinctly or not 
at all shouldered, and runs upward somewhat toward the aperture, 
causing a narrow, small posterior channel. Aperture shaped as in 
S. fuscolineatct Pse. but wider, the inner lip smooth, its edge raised 
and free ; outer lip with a wide yellow T internal border, inside of 
which it is thick, lirate and white. Anterior canal strongly 
recurved, short. Alt. 46, diam. 25 mm. Oblique alt. of aperture 
29 mm. 
Allied to S. longirostris Dkr., but less elongated, with more 
strongly plicate spire and different aperture, I cannot see that any 
of A. Adams’ unfigured species agree with the specimens before me. 
The spire is longer and more plicated than in S.fusoides Peeve, and 
the canal more recurved. 
LIST OF SHELLS COLLECTED IN JAMAICA. 
BY J. B. HENDERSON, JR. 
Third Paper: Operculata, Aquatic Pulmonata. 
203. Alcadia hollandi C. B. A. Duncans ; W. of St. Anns. 
204. Alcadia adamsiana Pfr. Mandeville. 
205. Alcadia solitaria C. B. A. Black River ; Bluefields ; Mt. 
Pleasant; Bog Walk. 
206. Alcadia depressa Gray. Bluefields; Ora Cabessa ; Bog 
Walk. 
