EAST AMERICAN SCAPHOPOD MOLLUSKS. 147 



apical orifice. Tlie ''concave'' side is strongly bulged out at the 

 equator and somewhat concaved between the equator and the two 

 ends. The apical orifice is round, pinched, and small but without 

 any prominent opaque rings or circular ledges within. The anterior 

 aperture in the type is broken and shows no characters. The apical 

 orifice is simple. 



The type is in the Museum of Comparative Zoology, Cat. No. 7750, 

 and measures — length, 4 mm.; diameter, 1.25 mm.; anterior aper- 

 ture, 0.62 mm.; apical aperture, 0.37 mm. It is from the United 

 States Coast Survey Station 19, off Bahia Honda, Cuba, in .310 fath- 

 oms, bottom temperature 52.25° F. 



The only specimen in the National Museum collection referable to 

 this species. Cat. No. 314934, U. S. N. M., is from Barbados and col- 

 lected by the State University of Iowa Expedition, the depth record 

 lost. The very inflated shape, median equator, round section, and 

 jnnched in apical orifice are the main characters. It seems not very 

 different from Watson's Cadulus ohesus except in that it is much 

 larger. It is also more inflated than C. Tialius. 



CADULUS (CADULUS) PLATENSIS, new species. 



Plate 20, fig. 14. 



1889. Cadulus tumidosus, Dall, Proc. U. S. Nat. Miis., vol. 12, p. 295 (not of 



Jeffreys, 1877). 

 1898. Cadulus tumidosus, Pilsbry and Sharp, Tryon's Man. Conch., vol. 17, 



p. 160, in part. 



The sheU is small and obese, thick and solid, with a median equator, 

 marked indistinctly by an obtuse angle and not flattened. The 

 median swelling is pronounced and bulbous. Both apertures are 

 rather large, the anterior one being oblique. The convex outline 

 describes a fairly regular deep curve; the concave outline is bulged 

 out at the equator and scarcely incurved at any point. No apical 

 features are observable. 



The type, Cat. No. 330S45 (a), U. S. N. M., measures— length, 5.5 

 mm.; diameter, 1.6 mm.; anterior aperture, 0.9 mm.; apical apertiu^e, 

 0.75 mm. It is from the U. S. B. F. Sta;tion 2764, off Rio de la Plata, 

 in llh fathoms, bottom of sand and broken shells. 



The ty]K^ lot consists of three imperfect shells, none of which 

 shows clearly the apical or anterior apertures, but they do show the 

 general sha])e of the shell. There is an unsual degree of variation 

 shown in the amount of median swelling and in the distinctness of 

 the angled equator. These same variations are shown in Jeffreys' 

 Cadulus tumidosus, to wliich northern Atlantic s])ecies this species 

 is certainly very closely allied. Our is a somewhat larger shell than 

 C. tumidosus, but were both inhabitants of the same faunal area 

 their specific identity could hardly be questioned. 



