A. E. Verrill on Shells from the Gulf of California. 223 
Chione suecincta, 
succincta Val, in Humb. Ree. d'Orbs., vol. ii, PL 48, fig. 1, p. 219, 1833, 
(t. re x _ Sena 
V. leucodon Sowerby, Proc. Zodl. Soc. Lond., p. 43, 1 
. Californiensis Broderip, op. vit., p. 43; Reeve, ey "PL xi, fig. 35, (non V. 
Californiana Con 
V. Nuttallti Conrad, Jour. Acad. Nat. Sci Phil., vii, p. 250, PL 19, fig. 16,1837 ; 
Reeve, Icon., Pl. xiii, ‘fig. 49, 1863. 
hione succincta Carpenter, Rep. Brit. Assoc., 1863, pp. 569 and 620. 
A fine series of this species is contained in the collection, 
including about fifty fresh specimens with valves together, and 
. over a hundred odd valves of all sizes. These show considera- 
+ ble esishon and confirm the synonymy of Dr. Carpenter, as 
| given aboy 
In this speci the ep when adult, is thick and heavy, 
apex, which is often purple or brown at = The ear is some- 
what triangular ovate, with the umboes and beaks quite prom- 
inent and recurved. The lunule is sometimes brown, gene- 
narrow and ribbed; the ligamentary area is excavate, 
smooth on the right valve, and often nearly so on the left, 
though more common! the concentric ribs extend gels aes 
it in the form of ¢ oe Bey more or less prominent wri 
slight folds; it is ecialyl tinged with light brown or pes 
= the right valve sometimes striped transversely wit 
€ sculpture is quite variable in the prominence and dis- 
tance between both the radiating and concentric ribs, especially 
the latter. Over the umboes the radiating ribs are sino, 608 and 
either alternate with smaller ones, are arranged by twos or t 
or are nearly uniform for some distance; posteriorly they he 
Come obsolete or nearly so, ‘eat in large e specimens “thes - 
ually fade out and disappear at 2 to 25 inches from thes apex, 
Gas the concentric ribs generall hee to become stronger, =~ 
crowded, and more recurved. neentric aoe. on the ¥ 1.4 
umbonal region are generally 10 to “5 of an inch distant, | 
toward the apex closer, and toward the base closely crowded, 
ugh not always so. The hinge is very strong, the teeth large, 
and the a sinus yery small. 
oo of the larger aeuaee give the following measure- 
* 
2°85 inches 2°65 2% 2-60 
ight . a . 248 2°55 
a oe se 
La Paz,—J. Pedersen. It appears: to live reg in sand or “443 
mud with only the posterior end exposed, which is therefore _ 
more or less worn and cas ; 
