MOLLUSCOUS ANIMALS. 
119 
The trunk appears to vary in length. Conus geographicus, and the wide mouthed Cones, have no oper- 
cula ; C. texlilis, C. striatus, C. Hebrceus, &c. &c. have distinct ones. 
The animal of these shells absorbs the outer layers of the inner whorls, leaving only the inner of the three 
to separate one twirl of the body from the other, thus lightening the weight of the shell without destroying 
in the least degree its strength, as the outer whorl is of the usual thickness, and at the same time furnishing 
itself with lime for increasing the size of its shell. 
Conus Solandri, t. 33./. 3. Broil, & Sow. Zool. Journ. v. 50. t. 40./. 4. 
Otaheite. 
Conus cylindraceus, t. 33./. 5. Brod. & Soiv. Zool. Journ. v. 51. t. 40./. 5. 
Conus Ximenes. ^ , 
Shell solid, smooth, grooved in front, pellucid, pinkish or purplish white, varied with purple brown, 
with close, nearly uniform, narrow, closely articulated brown and white spiral bands ; spire conical ; whorls 
concave, white, with a series of spots near the suture ; throat purplish. 
Inhab. Panama. 
Rarely the lines are alternately narrower, and sometimes the marbling is pale or wanting. This is one of 
the most beautiful of the genus. 
Conus interruptus, t. 33. /. 2. Brod. & Sow. Zool. Journ. iv. 379. 
Inhab. 
Conus arcuatus, t. 36./. 22. Brod. & Sow. Zool. Journ. iv. 379. 
Inhab. Pacific Ocean. Collection of Mr. Sowerby. 
PLEUROTOMA. 
Pleurotoma coniformis. 
Shell fusiform, solid, yellow brown, rather ventricose ; spire conical, acute ; whorls cancellately 
grooved, leaving square tubercles, with a broad deep spiral groove behind, having a series of tubercles 
before it. 
Inhab. 
Pleurotoma elongata. 
Shell turreted, elongated, pale brown ; spire very long, of fourteen whorls ; whorls four-keeled, the 
central keel largest, and very acute. The mouth ovate ; the canal short. Axis 3 inches, 
Inhab. 
Pleurotoma fascialis. Lain. Hist. vii. 93. 
Murex and Pleurotoma elegans. Wood. Cat. Suppl. t. 5./. 8. 
Inhab. 
Pleurotoma marmorata, t. 34. /. 9. Lam. Hist. vii. 95. — Martini, Conch, iv. 
t. 145./. 1345, 1346. 
Shell fusiform, turreted, white, varied with transverse brown wavy lines ; spire acute, rather shorter than 
the mouth ; whorls convex, unequally spirally ridged, with a short angular keel on the hinder part ; suture 
indistinct. Mouth ovate ; canal elongated, rather tortuous. Axis 2 inches ; diam. 7 lines. 
