26 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I 



ing ; remaining whorls with transverse, stout, shouldered ribs (on the last 

 whorl eleven) becoming obsolete anteriorly, and succeeded by a few (four or 

 five) revolving riblets at the anterior extreme of the canal ; suture appressed ; 

 lines of growth not evident; whorls rather inflated in appearance; notch very 

 slight; aperture small and unusually short; pillar very short, straight, and 

 pointed. Lon. of shell 4.5; of last whorl 2.25; of aperture, 1.25. Lat. of last 

 whorl, 1.75 mm. Defl. about 27°. 



Station 20, 220 fms. 



This very likely grows to larger size, and is notable for its peculiar trans- 

 lucent waxy lustre. 



Tn 1889 in the same publication, he figures it on plate ii, figure 34, 

 and on pages 91, 92 he states: 



Pleuroloma (Mangilia) lissotropis Dall, Bull. M. C. Z., IX. p. 58, August, 1881. 

 f Pleurotoma (Mangelia) hypsela Watson, Journ. Linn. Soc, XV. p. 433, Oct., 

 1881. Chall. Gastr., p. 341, pi. xxi. fig. 4, 1885. 



Habitat. Station 20, 220 fms., Gulf of Mexico; off Havana, in 127 fms.; 

 Station 273, near Barbados, in 103 fms. ; Stations 282 and 290, ofif Barbados, 

 in 154 and 73 fms., coral; Station 134, near Santa Cruz, in 248 fms., coarse 

 sand. Range of temperatures, 54°. 5 to 71° F. 



Mr. Watson's specimen is not sufficiently perfect to decide with certainty, 

 but it looks very much like the present species. The examination of better 

 material since the first description was made shows this species to have the 

 regular Drillia aperture and nucleus, and it is therefore referred to that genus. 

 The curvature and number of the ribs vary slightly, and the spaces between 

 are indifferently perfectly smooth, or finely spirally striate, especially toward 



the anterior end of the shell These shells are so very small and polished 



that it is extremely difficult for an artist in pure line-work to represent them 

 adequately. Only lithography with its delicate mutations of shade can do it 

 properly. For this reason our figures of this species are less satisfactory than 

 most of these which represent rougher and larger shells. 



Critically examining the material in the collection of the United 

 States National Museum, I find that Dr. Dall in his last report em- 

 braced three species under this name, one belonging to the genus 

 Leptadrillia Woodring, another to Syntonwdrillia Woodring, and a 

 third to an unnamed genus. Woodring, in selecting a specimen for his 

 genotype, unfortunately chose the specimen having the " spiral sculp- 

 ture consisting of fine threads on pillar and of microscopic threads 

 between ribs of later whorls," (Woodring), which applies not to Dril- 

 lia lissotropis Dall as defined in 1881, but to Drillia lissotropis Dall in 

 part, as emended by him in 1889. It is the Drillia lissotropis Wood- 

 ring 1928, an undescribed species, which I now call SyntomodriUia 

 zvoodringi. 



