166 



CONCHIFERA. 



Catillus. 



■5\illi incurved umbones; Linge linear, consisting of a series of 

 transverse groove.=, and extending on one side of the beaks 

 only, its direction, as regards the transverse diameter of the 

 shell, being generally oblique ; cartilage partly external. 



1. Catillus Cuvieri. — Cuvier's Catillus, pi. LXA^II. 

 fig. 21. 



Inoceramus Cuvieri. Sowerby, V. p. 59, pi. 441, fig. 1. 



Convex ovate, curved, generally one-third longer than 

 wide, and rather shallow ; anterior side concave, with a small, 

 almost smooth lobe near the beak ; beaks short, and rather 

 acute, hardly raised above the hinge-line, which is long ; sur- 

 face with transverse, distant, waved, shallow furrows ; the 

 laminated lines of growth are nearly equidistant, with the sur- 

 face between them smooth. 



This is a gigantic species, sometimes being found from four 

 to five feet in length. 



The Lower Chalk, Lyme Regis, Lewes, Royston, and 

 Petersfield. 



2. Catillus Brongxiartii. — Brongniart's Catillus, pi. 

 LXVIII. figs. 4, 5, 6. 



Inoceramus Brongniartii. Sowerby, V. p. 60, pi. 441,f.2,3. 



Oblong, gibbose, its length not quite double its breadth ; 

 posterior side cordiform, angular, and lobed ; anterior side 

 truncated, flat, and smooth ; beaks small, curved, and acute ; 

 surface with large transverse undulations. 



This species grow? to a large size- 



The Chalk, Lewes and Dover. 



3. Catillus cordiformis. — The Heart-shaped Catillus, pi. 

 LXVIIL fig. 15. 



Inoceramus cordiformis. Sowerby, V. p. 61, pi. 440. 



Equivalved, heart-shaped, width and depth nearly equal, 

 and its length a little more than the breadth; anterior side 

 angular ; posterior side not defined, but emanates gradually 

 from a hollow beneath the beaks, which are large and in- 

 curved ; surface transversely and interruptedly waved. 



In the Chalk, Gravosend, Lewes, and Norfolk. 



4. Catillus mytiloides. — The Mytilus-shaped Catillus, 

 pi. LXVII. fig. 5. 



Inoceramus mytiloides. Sowerby, V. p. 62, pi. 442. 



Equivalved, depressed, and elongated ; convex and obtuse 

 towards the beaks, which are short and sharp-pointed ; pos- 

 terior side produced ; hinge-line oblique ; surface with slight 

 irregular undulations. 



In the Chalk, Norwich, Gravesend ; the Lower Chalk, 

 Lewes, Warminster, Petersfield, and Lyme Regis. 



5. Catillus latus. — The Broad Catillus, pi. LXVIII. 

 fig. 8. 



Inoceramus latus. Sowerby, VI. p. 159, pi. 572, fig. 1. 



Depressed, ovate-rhomboidal ; valves equal ; anterior side 

 concave ; posterior side broad and expanding towards the 

 hinge-line, which is very oblique ; beaks small and short ; 

 surface with slightly elevated concentric undulations and 

 sharp strias. 



The Chalk, Brighton and Norfolk, and the Lower Green- 

 sand, Brasted, Kent. 



6. Catillus striatus. — The Striated Catillus, pi. LXVIII. 

 fig. 3. 



Inoceramus striatus. Sowerby, VI. p. 160, pi. 582, fig. 2. 

 Sub -globose, plain, anterior side concave and smooth ; 



beaks very short and obtuse ; surface with shallow concentric 

 furrows, and striated. 



Lower Chalk, Haytesbury and Lewes. 



7. Catillus ixvolutus. — The Involute Catillus, pi. 

 LXVIII. figs. 12, 13. 



Inoceramus involutus. Sowerby, VI. p. 160, pi. 583. 



Somewhat globular, valves very unequal, one of them consi- 

 derably inflated and even, with a large incurved beak, and its 

 side very concave, the other valve nearly flat, with deep, con- 

 centric undulations ; its margin very thick and deflected ; 

 hinge-line placed upon an elevated narrow lobe. 



The Chalk, Lewes and Norfolk. 



8. Catillus gryph^oides. — The Gryphse-formed Catil- 

 lus, pi. LXVIII. fig. 16. 



Inoceramus ffri/p/ueoides. Sowerby,VI. p. 161, pi. 584, fig. 1. 



Ventricose, ovate ; inequivalve, the smaller globose ; beaks 

 incurved, acute, and approximating ; surface concentrically 

 undulated. 



The Lower Greensand, West of Lyme Regis, ahd at Ring- 

 mer, &c. 



9. Catillus DUBius. — The Doubtful Catillus, pi. LXVIII. 

 fig. 2. 



Inoceramus dubius. Sowerby, VI. p. 162, pi. 584, fig. 3. 



Concave, ovate, pointed ; valves unequal ; beaks short and 

 pointed ; surface concentrically striated and indistinctly undu- 

 lated. 



Lias, Whitby, Yorkshire, and Vale of Gloucester. 



10. Catillus pictus. — The Painted Catillus, pi. LXVIII. 



fig. 7. 



Inoceramus pictus. Sowerby, VI. p. 215, pi. 594, fig. 1. 



Convex, oblong, valves equal ; anterior side somewhat 

 flattened and smooth ; surface a little wavy, almost covered 

 with small concentric furrows, and generally with longitudinal 

 stripes of brown colour. 



In the Chalk Jlarl, Guildford. 



11. Catillus digitatus. — The Fingered Catillus, pi. 

 LXVIII. fig. 14. 



Inoceramus digitatus. Sowerby, VI. p. 215, pi. 594, fig. 2. 



Shell very large, covered with large longitudinal furrows, 

 with the intervening ribs round and equal to the furrows, 

 crossed by distinct lines of growth. 



The Chalk, Debden, Essex. 



12. Catillus coxcentricus.— The Concentric Catillus, pi. 

 LXVIIL fig. 11. 



Inoceramus concentricus. Sowerby, III. p. 183, pi. 305. 



Ovate, inequivalve, length nearly double its width, one valve 

 deeper than the other, with the beaks much produced and in- 

 curved ; beak of the shallower valve very short ; both are 

 transversely undulated and striated, the striaa being the 

 edges of distant, imbricated plates or lamince ; hinge-line con- 

 taining about twelve grooves for the reception of the ligament. 



The shell consists of two coats, the outer one of a fibrous 

 structure, and brown coloured ; the inner pearlaceous. 



The Chalk Marl, Lyme Regis and Warminster ; the Ganlt. 

 Folkestone and West dialling ; the Red Chalk, Hunstanton ; 

 and the Lower Greensand, Pinbay, Devonshire, and Isle of 

 AVight. 



13. Catillus sulcatus. — The Furrowed Catillus, pi. 

 LXVIII. fie;. 1. 



