116 PROCEEDINGS OF THE NATIONAL MUSEUM vol. TO 



Genus IPHITUS Jeffreys, 1883 



IPHITUS TUBERATUS Jeffreys 



Iphitiis tuheratus Jeffreys, Proc. Zool. Sor;. London, for 1883, p. 114, pL 

 20, fig. 12. 



Off Georgia and Fernandina, rare and immature. 



IPHITUS RETICULATUS, new species 



Shell conic, white, with a brown styliform nucleus of three and 

 one-half subcylindrical whorls and about five subsequent moderately 

 rounded whorls; suture distinct, not deep; spiral sculpture forming 

 with the axial a very regular reticulum, the spirals flat; on the pe- 

 nultimate whorl five, the posterior smaller than the others; on the 

 last whorl six, the anterior forming a carinate border to the base, 

 in front of which on the flattish base are sLx smaller spirals; axial 

 sculpture of (on the last whorl about 20) retractively obhque equal 

 and equall}^ distributed flattish cords, with obvious incremental lines 

 in the interstices; the base is imperforate, the aperture strongly 

 recalls that of TricJioiropis. Height, 5.5; major diameter, 2.7 mm. 

 U. S. Nat. Mus. Cat. No. 108315. 



Two specimens off Georgia. 



The sculpture of this species is entirely different from that of 

 Jeffreys's type. 



Genus ARCHITECTONICA Bolten,1798 



ARCHITECTONIA BISCULCATA Orbigny 



Solarium bisulcatum Orbignt, Moll. Cuba, vol. 2, p. 66, pi. 19, figa. 17, 



20, 1845. 

 Solarium boreale Verrill and Smith, Trans. Connecticut Acad. Sci., vol. 6, 

 p. 529, pi. 57, figs. 29, 30, 1882; Proc. U. S. Nat. Mus., vol. 3, p. 376; 

 1880. 

 Off Georgia, 19, and off Fernandina, 6 specimens. Also off Cape 

 Cod in 55 fathoms, and off Marthas Vineyard in 115 fathoms, 

 United States Fish Commission, Cuba, Orbigny. 



Genus RISSOA Freminville 



RISSOA XANTHIAS Watson 



Rissoa xanihias Watson, Challenger Gastr., p. 588, pi. 44, fig. 5, 1886. — Dalf., 

 Blake Rept., p. 288, pi. 19, fig. 10, 1889. 

 Off Georgia and Fernandina, numerous. Off Culebra Island, 

 West Indies, in 390 fathoms, and off Pernambuco, Brazil, in 350 

 fathoms. Challenger expedition. 



The graduations between the typical form and the variety acu- 

 ticostata Dall (1889) are so easy that it is practically impossible to 

 fix a limit. 



