. Bulletin - New York State Museum. Science. BEEKMANTOWM AND CHAZY FORMATIONS OF CHAMPLAIN BASIN 423 As far as observation of the ectosiphuncle is possible in the type specimen, it appears that the septal neck did not reach beyond the preceding septum and that an endosipholining is absent, hence the reference by exclusion of the genera Vaginoceras and Cameroceras, to Endoceras, with some doubt. Endoceras magister sp. nov. Plate 8, figure i Description. Very large orthoceracone with large ventral siph- uncle and extremely deep cameras. The fragment here figured has a length of 250 mm and attain
. Bulletin - New York State Museum. Science. BEEKMANTOWM AND CHAZY FORMATIONS OF CHAMPLAIN BASIN 423 As far as observation of the ectosiphuncle is possible in the type specimen, it appears that the septal neck did not reach beyond the preceding septum and that an endosipholining is absent, hence the reference by exclusion of the genera Vaginoceras and Cameroceras, to Endoceras, with some doubt. Endoceras magister sp. nov. Plate 8, figure i Description. Very large orthoceracone with large ventral siph- uncle and extremely deep cameras. The fragment here figured has a length of 250 mm and attains a width of 106 mm; its rate of. Fig. 7 Endoceras magister sp. nov. Transverse section, .x ^'^ growth is 20 mm in 100 mm. The cameras are very deep, the septa in the average 22 mm apart and very concave, their concavity being as large or greater than the depth of the cameras. The living chamber has not been observed. The siphuncle is large, circu- lar ( ?) in section,^ its maximal width in the specimen 47 mm; the septal necks do not extend beyond the preceding septum. The surface is smooth. Position and locality. In the lower Chazy (B^ of our section) at the Valcour shore of New York. Observations. This imposing cephalopod is easily the master of the rest of the Chazy species by its dimensions and specially the depth of its chambers and the width of the siphuncle. No other form has been described from the Chazy of either New York or 1 The section figured [text fig. 7] shows that the specimen is com- pressed and the original sections of conch and siphuncle not any more 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 New York State Museum; New York State Museum. Albany : New York State Education Dept
Size: 2131px × 1173px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
