. Bulletins of American paleontology. Mexican ammonites: Verma & Westermann 223 /^»"-'''-/'. Kossmatio purisimo n. sp, (L bifurcoto C CT) ft flexicostoto {?cr) K exceptionalis ( ' cy) K. victoris K, zacotecong Text-fig. 21. — Scatter diagram of 'compression ratio' (H/W) fj. diameter (D) for Kossmatia purisima, n. sp., along with the possible microconchs of other species. With regard to compression, A', victoris (Burckhardt) falls near the lower range of K. purisima while the probable microconchs of A", bifuraila (Aguilera), A', flexicostata (Aguilera), A', cxcrptionalis (Aguilera
. Bulletins of American paleontology. Mexican ammonites: Verma & Westermann 223 /^»"-'''-/'. Kossmatio purisimo n. sp, (L bifurcoto C CT) ft flexicostoto {?cr) K exceptionalis ( ' cy) K. victoris K, zacotecong Text-fig. 21. — Scatter diagram of 'compression ratio' (H/W) fj. diameter (D) for Kossmatia purisima, n. sp., along with the possible microconchs of other species. With regard to compression, A', victoris (Burckhardt) falls near the lower range of K. purisima while the probable microconchs of A", bifuraila (Aguilera), A', flexicostata (Aguilera), A', cxcrptionalis (Aguilera) and K. zacatccana Burckhardt generally are beyond the upper range of K. purisima; all of them differ from A', purisima by their ornament. The inner whorls of the macroconchs of K. bifurcata, K. jlrxicos!a1a and K. exceptionalis are poorly known. regular!)^ spaced ribs of moderate density without marked chanj;e throughout the mature phragmocone; secondaries continuous on the venter with shght mid-ventral weakening, forming sharp ch-j\T()ns. Material. — Sixty specimens, mostly internal molds of phrag- mocones some of which are mature, well preserved: twenty-five from loc. lA (McM - J 1494/1-24, 136); four from loc. IB (McM - J 1494A/1-4); one from loc. 2 (McM - j 1495/66); three from loc. 10 (McM - J 1501/1, 2, 4); one from loc. 24 (McM J - 1509/1); one from loc. 32 (McM - J 1511/69); three from loc. 25 (McM - J 1517/45, 58, 60); four from loc. 3 (A4cM - J 1522/1, 2, 17, 18); one from loc. 11 (McM - J 1523/2); 13 from loc. 14A (McM -. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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