6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



Its large size and dark coloration distinguish it from Marginella 

 guttata and allied forms. 



ENGINA EARLYI, n. sp. 

 Plate 1, fig. 8 



Shell broadly ovate, blackish chestnut brown, excepting the inter- 

 costal spaces, which are chestnut brown ; the aperture is of brilliant 

 orange color with a dark spot on the upper portion of the columellar 

 callus and a more elongate, narrower one on the edge of the middle 

 of the columella. Early whorls badly eroded, the later ones with a 

 series of humplike nodules that occupy the anterior two-thirds of the 

 turns and extend over the base as axial ribs gradually diminishing in 

 size toward the tip of the base. Of these humps 8 are present on the 

 last turn. In addition to this sculpture, the whorls are marked by 

 spiral threads of somewhat variable width and spacing ; of these 10 

 are present between the summit and periphery on the last turn. The 

 base is slightly concave on the left margin and is marked by 5 spiral 

 series of knobs which gradually and uniformly diminish in size from 

 the periphery anteriorly. These knobs are about as wide as the spaces 

 that separate them and are arranged in axial series. The base also 

 bears spiral threads, which extend over the knobs and intercostal 

 spaces ; rather strong incremental lines are also present. Aperture half 

 as long as the shell, elongate pear-shaped, decidedly channeled ante- 

 riorly ; outer lip very thick, bearing a weak denticle below the posterior 

 angle, and 5 stronger, equally spaced, denticles occupying its middle ; 

 the inner lip also bears 3 denticles on its median portion and there is 

 also a denticle on the parietal wall a little distance from the outer 

 lip. The inner lip extends over half of the columella as a heavy callus, 

 which also covers the parietal wall. 



The type, U.S.N.M. no. 472566, has 5.5 whorls remaining and mea- 

 sures : Length, 12.5 mm. ; greater diameter, 8.4 mm. ; lesser diameter, 

 6.3 mm. It, and another specimen, U.S.N.M. no. 472855, were col- 

 lected in a tide pool in Sulivan Bay, James Island, Galapagos. It is 

 named for Mr. Stephen Early, Secretary to the President. 



NITIDELLA GUTTATA BAILEYI, n. subsp. 



Plate 2, fig. 6 



Shell ovate, turrited, early whorls pale brown, the later dark black- 

 ish brown ; base chestnut brown. The entire surface is dotted with 

 round spots of pale orange. Interior of aperture bluish white with the 





