oe 
224 A. EF. Verrill on Shells from the Gulf of California. 
Chione undatella. 
Venus undatella Sowerby, Proc. Zodl. Soc. Lond., iii, p. 22, 1835; Reeve, Icon., 
xiv, Pl. 16, fig. 68. 
v. neglecta, Gr ray, Voyage Blossom, p. 151, Pl. 41, fig. 8, eo & PP 
V. simillima Sowerby, Thes. Conch., xvi, p. 708; Reeve, Teon 
V. perdiz Val., Voyage, sur la fré égate la Vénus, PL 16, ‘fig. 2, eee 
V. subrostrata Reeve, Icon., xiv, fig. ae ges, (non non Lam. }: 
a WV. bilineata coors Reeve, Icon., Pl. 2 2, fig. 105 & 
undatella Des ., Catal. Veneridze of Brit. Mus., p. 141. 
A hale series of this variable species was obtained, Nees 
shows that several nominal species have been : 
ters that have no constancy. In its most normal Sonditiod: it is 
more swollen, less triangular above, with the anterior end less 
produced, and the beaks much less prominent than the sil 
ing. The sculpture, though variable, is similar, but generally 
The ule 
the concentric ribs are closer and more regular. lun 
and ligamentary area are similar, but the noah is perhaps gene- 
rally rougher on the right valve or both. inge is scarcely 
different, though somewhat variable with age, “put the posterior 
tooth is perhaps generally somewhat longer, and the inner edge 
of the hinge-plate a little more sinuous. The palial sinus, as 
in the preceding, is verysmall. The color is quite variable. It 
is rarely perfectly white; more commonly externally buff ve 
light cream-yellow, with trans — waved or zigzag 
stripes and radiating, siheh rrupted bands and reread 4 
patches and spots of brown, basdinics also of purplish. Some- 
times the brown markings are very light and searcely ee 
the general Ace! being buff; sometimes the mar 
regularly deeply angulated or zigzag lines, except on the cau 
which are blotched with brown; the ws ar is often bright brown 
; 
4 
: 
nee of this in the typical fo: orm, and some 
have this form of sculpture for an inch from the apex, ney ond 
on Ms fades out and the lamell are smoothish, or but slightly 
Height 2°05 inches. es 1 4 1:80 
«195 165 
ae : 2 105 1-10 
A laPaat Pedetsen. With the preceding. 
