472 PROCEEDINGS OF THE ACADEMY OF [1896. 



Harpa jacksonensis n. sp. PI. XVIII, fig. 10. 



Specific characterization. — Size and general form as indicated by 

 the figure; volutions 8 ; 1 and 2 very minute, smooth; 3 much 

 larger, smooth ; 4 somewhat larger than 3, showing vertical costse 

 in its first half, then assuming the characteristic markings of the 

 remaining whorls; costse on the body-whorl nine in number, some- 

 what deflected below the suture, as in i)?'t//ia; between the costse 

 the shell is finely cancellated with a net-work of raised lines ; ante- 

 rior canal slightly larger than usual for the genus. 



Locality, Jackson, Miss. 



Fusus insectoides n. sp. PI. XVIII, fig. 11. 



Specific characterization. — Size and general outline as figured ; 

 whorls 12 or 13 ; apex acute ; upper whorls broadly costate and 

 with strong and weak alternating spiral lines; 5 spiral lines on the 

 shoulder, decreasing in strength toward the suture ; sides of the 

 whorls with two or three strong, raised spiral lines, with two weaker 

 ones above and two or three weaker ones below; longitudinal lines 

 faint, showing only between the coarse spirals ; columella twisted 

 below; labium sharp and extending some distance away from the 

 columella ; sutures most remarkably constricted. 



Locality, Jackson, Miss. 



Fusus mortoni Lea, var. near carexiw Har. PI. XVIII, fig. 12. 



We have already called attention to the variation that this species 

 undergoes (Proc. A. N. S. Phila., 1895, p. 72) in the lower Claiborne 

 beds. Now we have it from Jackson showing a moderately large 

 size in many diflferent forms. The specimen figured is unusually 

 smooth ; others show stronger spiral lines, especially below the 

 carina. 



Locality, Jackson, Miss. 



Latirus leaensis n. sp. PI. XVIIT, fig. 1.3. 



Specific characterization. — Size and general form as indicated by 

 the figure ; whorls 11 ; 1 and 2 smooth ; 3 rather finely costate, re- 

 maining spiral whorls with eight rather low costse, considerably 

 wider than the interspaces, and arranged so that those on each 

 succeeding larger whorl are a little behind those of the preceding 

 or smaller whorl, and hence, although in line, the line falls back 

 perhaps i revolution from apex to base ; spiral lines on each whorl 

 6, large, with an equal number of intermediate strise. Body whorl 

 ornamented by 8 costse and alternate spiral lines to the end of the 



