408 BULLETIN OF THE 



Subgenus GLYPHIS Carpenter. 

 Glyphis fluviana n. s. 



Plate XIV. Fiss. 6, 6 a. 



Shell low, conical, reticulated, white or translucent, variegated with gray 

 or olive green lines or dots mostly radiately disposed; form variable with 

 station, but usually in the young and in more normal adults both slopes of 

 the cone are a little concave near the apex. The anterior slope slightly con- 

 vex; the posterior slope straight or a little concave, and usually a little longer 

 than the other, though these characters vary with station. Base is rounded 

 oval, symmetrical and equal at both ends, with a thin simple margin. Sculp- 

 ture of slightly irregular sudden enlargements of the shell, giving the effect 

 of very narrow steps, over which some twenty moderately strong and as many 

 more faint flattened radii seem to flow. In other specimens these step-like 

 edges are produced into low lamina?, and the ribs are also stronger and at the 

 intersections nodulous, or even a little scaly. Apex erect, truncate by the 

 pore, which is circular, simple, and within margined by a narrow horseshoe- 

 shaped callus. Exterior dull or unpolished, interior shining, with the color 

 rays and ribs visible through the thin shell. Two specimens measure, alt. 4.0 

 and 6.0, Ion. 10.6 and 9,5, lat, 6.6 and 6.5 mm., respectively. 



Habitat. Station 21, in 287 fms. Station 2, in 805 fms. Off Havana, in 

 80 fms., Sigsbee. Station 247, near Grenada (living), in 170 fms., ooze, bottom 

 temperature 53°. 5. Station 272, oft' Barbados (living), in 76 fms., shelly 

 bottom, temperature 65°. F. 



The gills, anus, mantle margin, foot, muzzle, and tentacles are as usual in 

 Fissurella. There is a row of about thirty minute epipodial cirri, continuous 

 behind, and advancing as far forward as the adductors. The e3^es are very 

 large and black, the right tentacle at its base behind the eye, in the male, 

 bears a well marked intromittent organ. This taken in connection with the 

 discovery of a similar organ in Cocculina, in Addisonia, and in Cranojpsis astu- 

 riana, would indicate that a majority of the deep-sea rhiphidoglossate limpets 

 possess this organ, that it was originally present in most, if not all, of the Bhiphi- 

 doglossa having a shell of this general form, that the organ has become obso- 

 lete in the shallow- water forms except the Neritidce^ but that the deep-water 

 forms, less modified by reason of their protective environment, have retained 

 it. It also confirms my original reference of Addisonia and its allies to the 

 Rhiphidoglossa, while the absence of such an organ in any of the Docoglossate 

 limpets, so far as known, is significant. It is dangerous to assume too much 

 in such cases, but I cannot help doubting if such an organ was ever developed 

 in the Docoglossate line. 



