MUSEUM OF COMPARATIVE ZOOLOGY. 205 



is entirely white. Tlie operculum has not been seen, ])ut is doubtless horny. 

 Max. alt. of shell, 13.0; of aperture, 9.0; max. lat. of shell, 12.3 mm. 



Habitat. Station 23, Gulf of Mexico, in 190 fms. Station 299, near Bar- 

 bados, in 140 fms. 



In one of the specimens the cloudy brown color was diffused, and most evi- 

 dent above the perii)hery. In the other it was more in the form of faint 

 transverse streaks. The shell is especially different from N. intricata in its 

 turrited spire and rounded whorls with radiating grooves above, and in the 

 peculiarities of the umbilical region below. 



Subgenus LUNATIA Gray. 



Lunatia tenuis Recluz. 

 Natica tenuis Recluz, Journ. de Conchyl., I. p. 388, pi. xii. fig. 7, 1850. 



Habitat. Off Cape San Antonio, in 640 fms. Off Cape Florida, in 84 fms., 

 green mud, U. S. Fish Commission, at Station 2648; also at Station 2626, 

 eighty-seven miles S. by E. ^ E. from Cape Fear, N. C, in 353 fms., sand, 

 bottom temperature 40°. F. Valparaiso, Recluz. 



The specimens agree admirably with Recluz's figure and description, but 

 are smaller than the dimensions he gives. There may have been an error or 

 misprint in those figures. 



Lunatia leptalea Watson. 



Natica leptalea Watson, Journ. Linn. Soc., XV. p. 261, March, 1880 ; Dall, Bull. 

 M. C. Z., IX. p. 93, 1881; Watson, Chall. Rep. Gastr., p. 441, pi. xxvii. 

 fig. 7, 1885. 



Habitat. Yucatan Strait, 640 fms. Sombrero Island, W. I., 450 fms.. 

 Challenger Exp. Bed of the Gulf Stream, off Gun Cay, in 500 fms.. Dr. Rush. 



A comparison of specimens leads me to believe that this species is identical 

 with one named by Dr. Jeffreys N. sphceroides, in his Report on the Valorous 

 Mollusca (Ann. Mag. Nat. Hist., April, 1876, p. 319). But Dr. Jeffreys did not 

 describe his shell sufl&ciently, or figure it, and subsequently doubted whether 

 it was not the young of a species he described in 1885 as N. operculata (P. Z. S. 

 1885, p. 35). His name has therefore no claim to be adopted. 



Lunatia fringilla Dall. 



Plate XXI. Fig. 13. 



Natica fringilla Dall, Bull M. C. Z., IX. p. 93, Sept., 1881. 



? Natica radiata Watson, Prel. Rep. Chall. Moll., Pt. VII. p. 258, March, 1881. 



Habitat. Yucatan Strait, 640 fms. ; off Cape San Antonio, 640 fms. ; near 

 Old Providence, at Station 2150, in 382 fms., ooze, bottom temperature 46°. F., 

 U. S. Fish Commission. 



