The Collected Works of Sir Humphry Davy Volume 44; Discourses Delivered Before the Royal Society. Elements of Agricultural Chemistry, PT. I (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...stages, lies near the base of the testis. T. savignii was described by Herdman from a specimen obtained by the' Challenger, ' whose locality was markedasdoubtfulbutprobablyfrom a station in 150 fathoms off the Cape of Good Hope. The close correspondence of Herdman's very detailed description with Bermuda and Florida specimens from shallow water suggests that the type may really have come from shallower water, and perhaps from Bermuda, where the Challenger Expedition also made collections. The American Museum contains specimens from Biscayne Bay, Florida, collected by myself, and one from off Salinas Cove, south coast of Porto Rico; the National Museum contains many from various points off the west coast of Florida from Cedar Keys to off Key West, also one from off the southeastern part of Jamaica. In American waters it grows on stones, shells, corals, gorgonians, etc., both along the shore at low-water mark and on the reefs and banks to depths of at least 27 fathoms. The series of specimens now available indicates that T. atrocanum (Van Name), 1902, from Bermuda was based on immature colonies of the present form and is not a distinct species. T. natalense Michaelsen, 1920, from a tide pool at Isipingo, Natal, does not appear to be distinct from this species. Michaelsen gives only eight to ten as the number of stigmata in a row, while American examples certainly usually have more, but he may have made the count on immature zooids. Trididemnum savignii form porites (Van Name), 1902 1902. Didemnum porites + Didemnum lucidum Van Name, Trans. Conn. Acad. Sci., XI, p. 360, PI. Li, figs. 26, 28, 29, 33, 37; PI. Lix, fig. 115. 1909. Trididemmim porites + T. lucidum Hartmeyer, Bronn's 'Tier-reich, ' III, suppl., pp. 1446, 1633. 1920. Trididemnum lucidum Michaelsen, Ja...