402 TRANSACTIONS OF THE WAGNER FREE 



the next whorl or two show unequal spirals, but over most of the shell the 

 sculpture consists chiefly of numerous regular, equal spiral threads with 

 subequal interspaces, there being a single strong thread, separated by a 

 narrow, shallow channel from the suture behind it, running up the spire ; the 

 base, slightly convex, is sculptured like the spire, the threads stronger toward 

 the pillar, which is, as usual in the genus, broad, with a narrow recess, not a 

 pit or chink, behind it; aperture subquadrate, the outer lip flexuous above at 

 maturity; the throat is not lirate. Alt. lo ; max. diam. of base 12 mm. 



This species, named in honor of Mr. G. D. Harris, Assistant Paleontologist 

 U. S. Geol. Survey, is related to eboreum and virginicuin, but seems specifi- 

 cally distinct from any of them. The description of Trochiis lapidosus 

 by Conrad agrees with the characters of C. Harrisii to some extent, but 

 Conrad's species is umbilicated and is stated to be related to T. humi/is, of 

 which, indeed, lapidosus may perhaps prove a synonym. 



Section Eutrochus A. Adams. 



This section is separated from the typical species of Calliostoma for conven- 

 ience, and includes the umbilicated forms. Some species like C . jtijubinnm 

 occasionally bridge the gap, this feature differing in different individuals, and 

 many species have a narrow umbilical chink in the adolescent state which 

 they lose when fully mature. 



Calliostoma (Eutrochus) dlstans Conrad. 



Leiolrochiis distans Conrad, Proc. Acad. Nat. Sci. for 1862, p. 288, 1863. 



Monilia [Leioirochtis) distans Conrad, op. cii. p. 569, 1863. 



Carinorbis distans Conrad, op. cit. p. 570, 1863. 



Zizyphi7ius punctaius Conrad, Am. Journ. Conch, iii. p. 257, pi. 21, fig. 5, Jan., 1868. 



Zizyphimts Btiani Conrad, op. cit. p. 258, pi. 2r, fig. 9, 1868. 



Zizyphinus arenosus Conrad, Proc. Acad. Nat. Sci. 1862, p. 569, 1863, 



Chesapeake Miocene of Maryland and Virginia, at St. Mary's River (O. 

 N. Bryan coll.), in Charles Co., Md. ; near Yorktown, Va., Harris; and from 

 Mrs. Purdy's marl-bed. Cape Fear River, N. C, Johnson (var. arenosiim). 



This species has a sufficiently varied synonymy. A specimen named by 

 Conrad was sent to the Smithsonian Institution labelled Zizyphinus distans. 

 Some years later Conrad borrowed the specimen and redescribed it under the 

 name oi pnnctatus, a slight corrosion of the shelly inatter along the impressed 

 lines having given them a punctate appearance. Another specimen in a 

 normal condition was received by Conrad about the same time from Mr. O. 

 N. Bryan, of Marshall Hall, on the Potomac, and was described as Z. Briani 

 {sic) m the same paper. In his catalogue of 1863 Conrad gave a name to a 

 figure published by Emmons (Geol. Rep. N. Carolina, p. .272, fig. 168) without 

 any name or diagnosis. He called it Z. arenosus, and the receipt of a specimen 

 collected by Mr. C. W.Johnson in North Carolina makes it reasonably certain 

 that this arenosus is only a rather depressed variet)' of distans. 



