A treatise on zoology . HE CYSTIDEA 77 amb— Gomphocystis, Hall (1804), Siluiiaii, N. America and Gotland (FiXLVIIL). Theca ilattencd above, greatlyelon<,ate below, composed of many irregularplates, pierced by diploj^ores. From a centralmouth five food - grooves radiate over thetheca, curving sinistrally around the upperpart, and occasionally descending a short dis-tance on the stem-like base. Covering-platesoften strongly developed, and grooves loweredbeneath thecal surface. Jaekel (1895) statesthat small side-grooves, but no brachioles,occur in a Gotland species. Anus close tomouth, in an
A treatise on zoology . HE CYSTIDEA 77 amb— Gomphocystis, Hall (1804), Siluiiaii, N. America and Gotland (FiXLVIIL). Theca ilattencd above, greatlyelon<,ate below, composed of many irregularplates, pierced by diploj^ores. From a centralmouth five food - grooves radiate over thetheca, curving sinistrally around the upperpart, and occasionally descending a short dis-tance on the stem-like base. Covering-platesoften strongly developed, and grooves loweredbeneath thecal surface. Jaekel (1895) statesthat small side-grooves, but no brachioles,occur in a Gotland species. Anus close tomouth, in an iiiterradius. Attachment ap-pears to have been by the base, as in Aristo-cijsfis. The curving of the food-grooves and theasserted absence of brachioles cause Gomplio-cystis to resemble many Edrioasteroidea. Butthe structure of the grooves seems to be thatwhich obtains in Diploporita, while thepresence of marked diplopores confirms the reference to that order. In any case the family is out of the main lineof Fio. Goiwphocystis tenojc, from aboveshowiiifi; course of food-grooves,and from side with outlines ofI) shown only in upper Hall. X ?. APPENDIX TO CYSTIDEA. The following names have been supposed to refer to Cystids :—Aseocystis, Barr., probably a Camerate , Barr., Hall (syn. LoboUthus, Barr,), root of a Crinoid {Scy2)hocrinus, apud Jaekel).Cardiocystis, Barr., , Hall, probably a Camerate , Eichwald {Pasceolus, Billings), now regarded as calcareous Algae ; at any rate not , a name used by Barrande for any indeterminable fragment, and not intended as a zoological , Conrad, is a Receptaculite. Hyponomc, Loven, the ejected viscera and disc of an , Beyricli, an Inadunate Crinoid (see p. 178).Lichenocrinus, Hall, the root of a Pelmatozoan (see p. 133).Mespilocystis, Barr., probably SteplLcino
Size: 1416px × 1764px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
