MUSEUM OF COMPARATIVE ZOOLOGY. 39 



Station 19, 310 fms. ; Station 20, 220 fms. ; Station 21, 287 fms. 

 The flattening is most prominent a little way behind the mouth in the adult, 

 and is best seen in an adolescent specimen. 



Siliquaria modesta n. s. 



Shell white, small, delicate, irregularly coiled, unattached, surface without 

 sculpture except that formed by the rounded incremental lines, which have 

 somewhat the appearance of floss silk when wound on a spool. Apical part a 

 simple cone, which bears marks of the slit as far as can be seen almost from 

 the first ; the apical and terminal portions usually more loosely coiled than 

 the middle part ; the slit near the mouth is open continuously, with an undu- 

 lated margin ; further back the prominent parts of the undulations approach 

 each other, finally joining, forming ovate holes, which, lastly, are entirely filled 

 up in the older third of the shell. The coils rarely exceed 25.0 mm. in length, 

 and gradually enlarge ; the diameter of the mouth is 3.0 mm. or less ; of the 

 widest part of the slit, about 0.5 mm. Found at all depths from 80 to 800 

 fathoms, but not in less than 80 fathoms. The specimen from which the de- 

 scription was taken lived in 220 fathoms (Station 20). The shell is so very 

 fragile that only living ones came up in even tolerable condition ; the dead 

 ones can hardly bear touching. It is evidently suited only to a soft and quiet 

 bottom. 



Bivonia exserta n. s. 



Shell white, uncoiled or only curved ; short, stout, thick, attached by its 

 tip only, and rising upward and forward from this support. Interior of tube 

 circular in section, smooth ; exterior having five longitudinal ribs, or keels, 

 and otherwise deeply and strongly annulated, looking like a pile of round- 

 edged coins or biscuit, one upon another. Lon. 11.0 mm. Diam. 2 mm. 

 Internal diam. 1.0 mm. Length of attached portion, 3 mm. 



This has a remarkable sculpture, and is only provisionally referred to Bivo- 

 nia, as the operculum is unknown. Found with the last. 



Pedicularia albida n. s. 



Shell in the embryonic state (as seen imbedded in young specimens) appar- 

 ently having somewhat the shape of an immature MargineUa, of a deep pink 

 or salmon colo^, the visible surface of the nuclear whorl polished, smooth, the 

 second with a sharp keel, the succeeding ones granulated or reticulated, but 

 generally so immersed in the adult Bhell as to be indistinguishable, The 

 whorls of the adolescent shell white, marked with numerous even, tine re- 

 volving threads, separated by equivalent grooves, both becoming coarser with 

 growth and terminating in denticulations on the margin and the distinct colu- 

 mella ; these threads are prettily reticulated by the lines of growth. In the 

 adult, the outer lip and the outer margin of the columellar callus (which is 



