154 " TRANSACTIONS OF THE WAGNER FREE 



front of the first, then an interspace of greater width with the strongest spiral 

 in front of it, then the peripheral interspace, twice as wide as the strongest 

 spiral, then another strong spiral followed by a narrower channel, and three 

 more basal spirals with diminishing interspaces on the base, and three or four 

 rather obscure and less elevated spiral cords on the canal ; of secondary spirals 

 much smaller than the primaries, there are one or two in the wide peripheral 

 channel, and sometimes a single one elsewhere ; lastly, the whole surface is 

 more or less sculptured by fine, incised spiral lines. The transverse sculpture 

 is of fine wrinkles, in harmony with the incremental lines, which cover most of 

 the shell ; the ribs are slightly but irregularly undulated in some places ; 

 aperture ovate, pillar-lip with a thin, smooth callus ; edge of the outer lip 

 undulated by the sculpture, the interior Urate, with about ten sharp, prominent 

 lirae disposed somewhat in pairs ; canal very narrow and deep, shorter than 

 the aperture; umbilicus flaring, variable in diameter, deep, bounded by the 

 rounded edge of the fasciole, within axially striated, but not otherwise sculpt- 

 ured. Lon. of shell — ?, of last whorl from the suture at the aperture forward 

 20.0; diam. of last whorl 21.5 ; of the umbilicus in two specimens 5.0 and 

 6.5 mm. respectively. 



Having only two imperfect last whorls of this species at present, I defer 

 figuring it in the hope of receiving better material. 



Genus CYMIA Morch. 



Cuma Swainson, Malac, pp. 73, 87, 307, 1S40 ; Cooke, Journ. of Conch, v. p. 172, 1S87. 



Not of Milne Edwards, 1S28, Crustacea. 

 Cymia Morch, Mai. Blatt. vii. p. 98, 1861. 



Triionopsis Conrad, Am. Journ. Conch, i. p. 20, 1865 (name only). 

 Fasciolina Conrad, Am. Journ. Conch, iii. p. 186, 1867. 



Shell purpuroid, with a single strong, elevated ridge on the middle of the 

 pillar. Type C. tectum Wood, W. America. The group ranges from the 

 Upper Eocene to the recent fauna. 



Morch has pointed out that Ciinia Humphrey (beside being a mere cata- 

 logue name not entitled to stand in any event) was a heterogeneous assembly 

 in no way related to the present group. The name, properly proposed, is in 

 universal use for a well-known group of Crustacea. Swainson's use of it for 

 a mollusk is positively barred from both sides. Morch's proposed substitute 

 is therefore entitled to adoption. The Cjtvia of Tryon's Manual, as has been 

 effectively shown by Cooke, is an heterogeneous assembly, and his remarks 

 on the name of the group are out of harmony with the general usage of 

 scientific men, as well as defective in knowledge of the history of the name. 

 Conrad's undescribed Tritonopis {siibalveatiim), from the base of the Vicksburg 

 beds, is a Cymia, 3.5 I have determined by an examination of his type. 



