V °l889. ri '] PROCEEDINGS OF THE NATIONAL MUSEUM. 295 



Dentalium Gouldii Dall. 

 D. Gouldii Dall, Bull. Mils. Coinp. Zool. xvili, p. 424, PI. xxvi, Fig 4, June, 1889. 



This extends from South Carolina to the Antilles and southward to 

 Station 2762, east from Rio Janeiro, in 59 fathoms, mud; temperature 

 57o.l F. 



Genus CADULUS Philippi. 



Cadulus albicomatus sp. nov, 

 Plate ix, Fig. 8. 



Shell resembling C. spectabilis Verrill, but larger, with a less promi- 

 nent equator, more compressed in an antero-posterior direction, and with 

 the anal opening produced at the sides and roundly excavated iu frout 

 and behind instead of notched laterally and produced mediauly. Color 

 milk-white ; incremental sculpture indicated only by more or less trans- 

 lucent rings in the shell substance; longitudinally sculptured by ex- 

 tremely fine sharp grooves with equal interspaces which cover tbe whole 

 of the shell; curvature moderate, nearly uniform, slightly more marked 

 near the anal end ; the whole shell distinctly compressed though not 

 flattened, except below tbe oval aperture, where the shell is impressed, 

 making a shallow sulcus extending backward nearly two millimeters, 

 and in front arching tbe margin so that the perfect aperture is distinctly 

 reuiform with sharp thin edges. There is no swollen equatorial girdle; 

 the greatest diameter is near the posterior end of the above-mentioned 

 sulcus, whence the shell tapers evenly backward; aperture slightly 

 oblique; anal aperture nearly circular, concavely arched, but not notched 

 in front and behind ; longitude of shell on its dorsal chord, 24; perpen- 

 dicular to the chord, 2; diameter of oval aperture, 3; anteroposterior 

 diameter, 1.5; diameter of anal aperture, 1; maximum diameter of shell, 

 3.4; antero-posterior diameter of shell, 3 mm . 



Hab.— U. S. Fish Commission Station 2792, in 401 fathoms, mud; off 

 Manta, Ecuador; temperature 42°.9 F. 



This species was obtained about 40 miles south of the equator in west 

 longitude 81°. It is one of tbe largest and finest species of tbe genus, 

 and the only one known to me which is distinctly longitudinally sculp- 

 tured. 



Cadulus quadridentatus Dall. 



Found at Station 2765 in 10£ fathoms, sand, off Rio de la Plata. It 

 extends northward to Cape Hatteras and has also been found at Fer- 

 nando Noroiiha and the west coast of Florida in 7 to 50 fathoms. 



Cadulus tumidosus Jeffreys. 



Dredged at Station 2760, 90 miles north from Ceara, Brazil, in 1,019 

 fathoms, broken coral, temperature 3U°.4 F. It has been dredged in 

 deep water iu several parts of the North Atlantic, the Bay of Biscay, 

 and near the Canaries. The specimens have been compared with those 

 iu the Jeffreys collection. 



