193 



2985 Cerithiopsis ( Cerithiopsis ) oxys 



Type locality: — Point Abreojos, Baja Cal. — San Pedro bay, 

 Cal. 



"Shell minute, elongate-conic, dark brown. Nuclear whorls 

 almost 4, forming a slender, elongate-conic spire, having the 

 whorls well rounded. Post-nuclear whorls well rounded, separ- 

 ated by a strongly channeled suture, marked by 3 equally strong, 

 spiral cords, the first of which is at the summit, the 3d slightly 

 above the periphery, while the 2d is median between these two. 

 In addition to the spiral cords, the whorls are marked by ver- 

 tical, axial ribs, almost as strong as the spiral cords. Of these 

 ribs, 16 occur upon the first, 20 upon the 2d, 18 upon the 3d to 

 5th, and 24 upon the penultimate turn. The junctions of the axial 

 ribs and spiral cords form strong tubercles of which those of the 

 posterior cord are rounded while the other 2 are truncated pos- 

 teriorly and slope gently anteriorly, while the spaces inclosed be- 

 tween the spiral cords and axial ribs are strongly impressed, 

 rounded pits. Periphery of the last whorl marked by a strong 

 cord which is feebly nodulose and separated from the tuberculate 

 keel posterior to it by a channel as wide as those occurring on 

 the spire; this channel is marked by the continuations of the axial 

 ribs. Base moderately long, marked by a strong, spiral cord 

 about halfway between the peripheral cord and the insertion of 

 the columella, the spaces which separate it from the peripheral 

 cord on one side and from the columella on the other, appearing 

 as deep, rounded channels. Aperture rather small, irregularly 

 ovate, very strongly channeled anteriorly; posterior angle obtuse; 

 outer lip rendered sinuous by the external sculpture; columella 

 very stout, twisted revolute, and reflected; parietal wall glazed 

 with a thin callus." 



2986 Cerithiopsis (Cerithiopsis) cerea Cpr. 



Type locality: — Mazatlan, Mexico, on Spondylus, as also the 

 next. 



2987 Cerithiopsis (Cerithiopsis) sorex Cpr. 



2988 C. (Cerithiopsis) pupiformis Cpr. Mazatlan. 



2989 C. (Cerithiopsis) abreojoensis 



Type locality: — Point Abreojos, Baja California. 



2990 Cerithiopsis (Cerithiopsis) Berryi 



"Shell small, elongate-conic, brown. Nuclear whorls 4, well 

 rounded, separated by constricted sutures, smooth, forming a mu- 

 cronate apex to the shell. Post-nuclear whorls strongly sculp- 

 tured, having 3 spiral cords between the sutures, of which the one 

 at the summit is much smaller than the rest on the early whorls; 

 the other 2 are subequal in strength, the 2d one being close to the 

 one at the summit, while the 3d is almost halfway between the 2d 

 and the suture. On the last whorl, the cord at the summit is al- 

 most equal to the other two. In addition to the spiral sculpture, 

 the whorls are marked by vertical axial ribs which are stronger 

 than the spiral cords. Of these ribs, 12 occur upon the 2d, 16 

 upon the 3d to 5th, 18 upon the 6th, and 20 upon the penultimate 

 turn. The junctions of the axial ribs and spiral cords form strong 

 tubercles, which are truncated posteriorly and slope gently ante- 

 riorly. The spaces inclosed between them are elongated, narrow 

 pits between the 1st and 2d spiral cords on the early whorls, while 

 on the last they are squarish pits in this region. The spaces be- 

 tween the median and supraperipheral cord are strongly im- 

 pressed, large, squarish pits on all the whorls. Sutures strongly 



