UNITED STATKS ANl* NOKTIIKUX MKXHO. 37 



UnIO CAMKLOI'AKDILIS. PI. 51), ilg. 180. 

 Testa Isvi, oblonga, subinflata, inacquilaterali, postice obtuse biangulala, antiee regulariter rotundatft ; 

 valvulissubtcnuibus, antiee crassioribus ; natibus prominulis, ad apices ruguso-undulatis ; epiderraide 

 lutcil, politil, undique virido-maculata ; dentibus cardinalibus parvis, erectis, compresso-pyramidatis 

 crcnulatisquo ; lateralibus longis, lamellatis subrectisque ; margarita lutco-alba et valdc iridcscente. 



Shell smooth, oblong, rather inflated, inequilateral, obtusely biangular behind, 

 regularly rounded before; valves rather thin, thicker before ; beaks somewhat promi- 

 nent, rugosely undulate at the tips ; epidermis yellow, polished, spotted with green all 

 over ; cardinal teeth small, erect, compressed-pyramidal and crenulate ; lateral teeth 

 long, lamellar and nearly straight ; nacre yellowish white and very iridescent. 

 Froc. Acad. Nat. Sci. 1860, p. 92. 



Hah. — North Alabama. Prof. Tuomey. 



My cabinet. 

 Diam. G, Length 11, Breadth 2 inches. 



Shell smooth, oblong, rather inflated, inequilateral, obtusely biangular behind, 

 regularly rounded before ; substance of the shell rather thin and semitransparent 

 behind, thicker and ob.«cure before; beaks somewhat prominent, roughly undulate at 

 the tip ; ligament rather long and thin ; epidermis rather bright yellow, smooth and 

 polished, covered over the whole disk with subquadrate green snots in regular rows, 

 increasing in size from the beaks to the margin, with two distinct distant marks of 

 growth ; umbonial slope slightly raised and rounded ; posterior slope somewhat cari- 

 nate and covered with smaller green spots ; cardinal teeth small, erect, compressed- 

 pyramidal, disposed to be double in the right, as it is in the left valve ; lateral teeth 

 long, lamellar, nearly straight and thickened towards the end; anterior cicatrices 

 distinct and well impressed ; posterior cicatrices confluent and slightly impressed ; 

 dorsal cicatrices placed on the under side of the plate behind the cardinal tooth ; 

 cavity of the shell somewhat deep and rounded ; cavity of the beaks rather shallow 

 and subangular; nacre white with a tint of yellow in the cavity and in the teeth, very 

 iridescent. 



Remarks.— T\ih is a very striking species. In outline it is near to imliaUis, 

 Kavenel. In color and in the spots it is xiQ?ir io pidus (nobis), but the yellow ground 

 is rather dafker and the spots are closer and more quadrate. It may easily be distin- 

 guished {r:om pictus by its outline being oblong and not elliptical as is the case with 

 that species. It also differs entirely in the lines of growth, there being two distant 

 ones on the camelopardilis, while the Rictus has usually five, which are very much 

 closer. The inctiis is also of a much more compressed form and much more inequi- 

 lateral. In the angle of the cardinal teeth they are quite diflerent. This very beauti- 

 ful species has the most remarkable regularity of green spots which pervade the whole 

 disk. Between the regular rows of spots, very minute capillary lines may be seen 



