. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 274 M. K. A. Zlttel on the kindness of Dr. Steinmann, is identical with Cylindro- j)hyma. Mr. Linck, hoAvever, points out some peculiarities of these skeletal corpuscles which show that my definition of the Anomocladina is not quite correct. Thus Linck's figures (I. c. Taf. ii. fig. 4) represent isolated skeletal corpuscles, " globularly thickened " at both ends and showing a simple axial canal. The axial canal terminates at both ends before the thickened inflations,
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 274 M. K. A. Zlttel on the kindness of Dr. Steinmann, is identical with Cylindro- j)hyma. Mr. Linck, hoAvever, points out some peculiarities of these skeletal corpuscles which show that my definition of the Anomocladina is not quite correct. Thus Linck's figures (I. c. Taf. ii. fig. 4) represent isolated skeletal corpuscles, " globularly thickened " at both ends and showing a simple axial canal. The axial canal terminates at both ends before the thickened inflations, and thus, as Mr. Linck justly re- marks, the supposition that several branches meeting together in a node belong to one skeletal corpuscle becomes impos- sible. In Cylindrophyvm^ therefore, as in Astyhspongia, the production of the nodes is to be explained as effected in this way—the thickened or, more properly, branched ends of several skeletal elements meet together and become amalga- mated. The distinction between AstyJospongia and PaJceo- wanon on the one hand and Gylindrophyma^ Mclonella^ and Mastosia on the other consists chiefly in the fact that in the Silurian genera the straight, rod-like skeletal elements only emit short root-like branches at their extremities, while in the Jurassic forms a stronger furcation of the ends often occurs, and sometimes larger side branches may issue from the main Fie:. 3. rio-. E^^^'-V"^^ Fig. 3 a-(l.—Skeleton of Cijlindrophyma miUcporata, Goldf., Upper Jura f, Sontlieim. Fig. 4 a-e.—Skeleton of Lecanvlln patcra'fonnis, Zitt., Upper Jura e, Sonlheim. Enlarged 25 diameters. bar. Mr. Schwager has drawn figs. 3 a-d from an unusually well-preserved specimen of CyJindropliyma from the Upper Jura € of Sontheim ; and these show clearly tlie mode of production of the nodes and the construction of the skeleton, and at the same time prove the typical agreement with Asiylo-. Please note that these images are extracted from scanned
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