History of British animals - University of Guam Marine Laboratory

Productus. MOLLUSCA. SESSILIA. 3797. P. Martini Semicylindrical, convex above, with a flattened front,deeply striated ;a few spines ;lesser valve nearly flat, deeply inserted ; hingeline equal to the width of the shell—Ammonites prod. Mart. Derb. t. xxii.f. 1, 2, 3. P. Martini, Sower. Min. Conch, t. cccxvii. f. 2, 3, 4 ; and P. concinnuslb. t. cccxviii. f. i.—In Carboniferous Limestone, common.8. P. lobatus Convex valve with a mesial groove ; spines few ; the ribscoarser, and the sides more compressed than the preceding species, with whichitmay be readily confounded.— Sower. Min. Conch, t. cccxviii. f. 2-6 ; andP. sulcatus, lb. t. cccxix. f. 2—In Carboniferous Limestone.9. P. horridus Quadrangular, with a large furrow along the middle, eared,thorny ears prominent, subcylindrical beak much ; ; incurved, large—Sower Min. Conch, t. cccxix. f. 1—In Magnesian Limestone.10. P. humerosus.—Oblong, squarish, depressed, striated, spinose ? or hispid? hinge line less than the width of the valve in the ; larger valve are twovery deep cavities near the beak, and a third connected with the beak ; frontflattish Sower. Min. Conch, t. cccxxii—In Magnesian Limestone.11. P. giganteus Transversely oblong, with dilated sides and rugose irregularstrue, longitudinally undulated or sulcated ; larger valve gibbose.—Amonites giganteus,Mart. Derb. t. xv. P. gig. Sower. Min. Conch, t. cccxx.— Carboniferous Limestone.12. P. crassus.— Hounded, longitudinally sulcated, ard striated ; striae tubercular;sides not dilated.— Ammonites crassus, Mart. Derb. t. xvi—CarboniferousLimestone.13. P. personatus.—Hemispherical, irregularly striated, beneath very concave;within the larger valve are three deep cavities, one connected withthe beak, and two remote Sower. Min. Conch, t. cccxxi.— CarboniferousLimestone.14. P. punctatus Shell rounded, slightly elongated, with a shallow mesialdepression transversely sulcated the anterior ;part of the furrows and theridges thickly covered with long cylindrical spines, concealing the shell—Concbse pilosse, Ure, Ruth. 316. t. xv. f. 7- Anomites punctatus, Mart.Derb. t. xxxvii. f. 6, 7, 8. P. punct. Sower. Min. Conch, t. cccxxiii—In CarboniferousLimestone.15. V.fimbriatus. Shell slightly elongated, rounded, gibbous towards theapex, with rather distant transverse ridges ; thinly spinous —Sower. Min.Conch, t. cccclix. f. 1.— Carboniferous Limestone.16. P. semireticulatus.— Semiorbicular,_with a shallow mesial depression ;longitudinally striated, the striae rude, "strong, and unequal; transverselywrinkled Anomites semi. Mart. Derb. t. xxxii. f. 1-4—In CarboniferousLimestone.17. P. hemispheericus Hemispherical, longitudinallystriated ; striae fine ;lower valve very concave Sower. Min. Conch, t. cccxxviii— CarboniferousLimestone.18. P. comoides Semicircular, gibbose, very finely striated; disk inflated;back straight, extending the whole width of the shell—Sower. Min. Conch,t. cccxxx.— Carboniferous Limestone.19. P. latissimus.—Transverely oblong, depressed, coarsely striated ; beakmuch incurved; hinge line very long.— .Sower. Min. Conch, t. cccxxx.— CarboniferousLimestone.