Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . o foundsome bivalvesof a less un-common shape(Avicula de-cussata); [andin the upperstages of theSilurian groupin England wefind Or this or- bicularis (1), Terebratula navicula (2), Orthis navicularis,(3) Pentameus Knightii (4), Atrypd affinis (5), fig. 3/7-j § 663. The gasteropoda are less abundant; some of themare of a peculiar shape and structure, as Bucania expansa,Euomphalus hemisphcericus. Those more similar to ourcommon marine snail
Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . o foundsome bivalvesof a less un-common shape(Avicula de-cussata); [andin the upperstages of theSilurian groupin England wefind Or this or- bicularis (1), Terebratula navicula (2), Orthis navicularis,(3) Pentameus Knightii (4), Atrypd affinis (5), fig. 3/7-j § 663. The gasteropoda are less abundant; some of themare of a peculiar shape and structure, as Bucania expansa,Euomphalus hemisphcericus. Those more similar to ourcommon marine snails have all an entire aperture; those witha canal being of a more recent epoch. § 664. Of the cephalopoda we find some genera not lesscurious, part of which disappear in the succeeding epochs;such, in particular, as those of the straight, chambered shellscalled orthoceratites, some of which are twelve feet in length(Orthoceras ventricosum). There are also found some of acoiled shape, like the ammonites of the secondary age, buthaving less complicated partitions (Lituitesyiganteus, 7). Thetrue cuttle-fishes, which are the highest of the class, are not.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1870
