350 PROCEEDINGS OF THE NATIONAL. MUSEUM Vol.89 



The specimen figured, U.S.N.M. No. 356358, is a cotype collected 

 by Gundlach. It has 4 whorls and measures: Length, 9.2 mm.; 

 greater diameter, 16.2 mm.; lesser diameter, 13.0 mm. 



Gundlach says of the animal (Malakozool, Blatter, vol. 10, p. 

 193, 1863): "Animal gray with greenish suffusion; sides of foot marked 

 by spots composed of white dots. Tentacles coral red becoming paler 

 from the tip to the middle. The edge of the snout is of the same (coral 

 red) color. The rest of the snout to the forehead is blackish. Fore- 

 head and the region about the eyes much paler than the body." 



ANNULARIA (ANNULARISCA) FALLENS, new species 



Plate 43, Figures 4-6 



Shell depressed -he Ucoid, straw yellow, with the peristome whitish 

 and the interior of the aperture of the same color as the exterior. 

 Nuclear whorls 1.5, smooth except for the last portion of the last 

 turn, which shows the beginning of the postnuclear axial sculpture. 

 Postnuclear whorls inflated, strongly rounded, marked by well-devel- 

 oped, very closely spaced, regular, retractively slanting axial riblets, 

 which are separated by spaces about as wide as the riblets. Suture 

 narrowly channeled. Periphery strongly rounded. Base short, 

 strongly rounded, openly umbihcated, marked by the continuation of 

 the axial sculpture. On the umbilical wall 1 1 spiral threads are present 

 in addition to the axial riblets, which render the latter wavy and 

 feebly nodulose. Aperture broadly oval; peristome double, the mner 

 and outer coextensive and fused, narrowly reflected, differentiated only 

 at the posterior angle, where the inner peristome is indicated as a 

 slight shelf. Operculum typically annidarid. 



The type, U.S.N.M. No. 104552, is one of three collected by Gund- 

 lach, and it is labeled Guantanamo. It has 4.2 whorls and measures: 

 Length, 8.3 mm.; greater diameter, 13.5 mm.; lesser diameter, 10.6 

 mm. 



A series of 20 specimens, all from old collections, are in the United 

 States National Museum. 



This species differs from the others in being in every way less 

 heavy, in having the ribs much narrower and more closely spaced, in 

 being practically unicolor, and in having the inside of the aperture 

 straw-colored instead of orange. 



ANNULARIA (ANNULARISCA) ALATA (Pfeiffer) 



Plate 43, Figures 1-3 



1851. Cyclostoma alatum Pfeiffer, Pi-oc. Zool. Soc. London, p. 250. 



1852. Choanopoma? alatum Pfeiffer, Catalogue of Phaneropneumona ... in 



the British Museum, p. 117. 



