The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . 36o BRACHIOPODA but the custom has continued to prevail among Eastern nationsto the present time, and many of the types that were commonin Europe in prehistoric times are still worn in central Asia. A treatise, DeArmillis Veterum, by Thomas Bartholinus, waspublished at Amsterdam in 1676. BRACHIOPODA, an important and well-defined but extremelyisolated class of invertebrates. The group may be defined asfollows: Sessile solitary Coelomata with bivalved shells usuallyof unequal size and arranged dorso
The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . 36o BRACHIOPODA but the custom has continued to prevail among Eastern nationsto the present time, and many of the types that were commonin Europe in prehistoric times are still worn in central Asia. A treatise, DeArmillis Veterum, by Thomas Bartholinus, waspublished at Amsterdam in 1676. BRACHIOPODA, an important and well-defined but extremelyisolated class of invertebrates. The group may be defined asfollows: Sessile solitary Coelomata with bivalved shells usuallyof unequal size and arranged dorso-ventraUy. The head isproduced into ciliated arms bearing tentacles. They reproducesexually, and with doubtful exceptions are of separate sexes. The name Brachiopod (|3paxiwj, an arm, and iroiis, iroSos, afoot) was proposed for the class by F. Cuvier in 1805, and byA. M. C. Dumeril in 1809, and has since been very extensivelyadopted. The division of the group into Ecardines (Inarticulata),. Figs, i-ii.—Various forms of Brachiopoda. 7- 1. Magellania cranium. A,dorsal valve. 2. Rhynchonella and 4. Thecidea. 5. Spirifer. Dorsal showing calcareouscoils. 6. Orthis calligramma. Leptaena transversalis. A, ventral, B, dorsal horridus.(Hemithyris) 9. Lingula pyramidata (afterMorse). 10. Discinisca lamellosa. 11. Crania anomala. Interior ofdorsal valve, showing mus-cular impressions and labialappendages. [Waldheimia]ventral, B, valve,spiral with no hinge to the shell and with an alimentary canal open atboth ends, and Testicardines (Articulata), with a hinge betweenthe dorsal and ventral valves and with no anus, was proposedby Owen and has been adopted by nearly all authors. In alater scheme based on our increased knowledge of fossil forms,the Brachiopoda are divided into four primary groups (orders).This is given at the end of the article, but it must not be forgottenthat the existing forms with an anus (Ecardines) differ markedlyfrom the aproctous me
Size: 1360px × 1837px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
