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Show 1878.] 'LIGHTNING' AND ' PORCUPINE ' EXPEDITIONS. 405 sphenoidea of Philippi to the variety trigona of his own T. irregularis, which is represented as having the skeleton of T. septata or some other septigerous species of the subgenus Waldheimia. Subgenus II. Waldheimia. Loop long, reflected. 6. TEREBRATULA TENERA, Jeffreys. (Plate XXII. fig. 7•) T. tenera, Jeffr. in Ann. & Mag. N. H., Sept. 1876, p. 250. 'Valorous' Exp.' 1450 f. 7. TEREBRATULA CRANIUM, Miiller. T. cranium, Miill. Zool. Dan. Prodr. p. 249, no. 3006 : Br. Conch, ii. p. 11 ; v. p. 163, pl. xix. fig. 1, la. ' Lightning' Exp.: St. 2, 170 f. ; 4, 530 f. ; 5, 189 f.; 7, 650 f. ; off the Faroes, 164 and 208 f. 'Porcupine' Exp., 1869: St. 14, 173 f.; 15, 422 f. ; 23a, 420 f. ; 25, 164 f. ; 46, 374 f. ; 50, 355 f. ; 57, 632 f.; 61, 114 f.; 65, 345 f.; 74, 203 f.; 75, 250 f. ; 78, 290 f.; 83, 262 f. ; 84, 155 f.; 85, 190 f. 1870 : St. 1, 567 f. ; 2, 305 f.; 3, 690 f. (and var. oblonga) ; Vigo Bay, 30 f. ; 24, 292 f. Greenland (Wallich, Mobius), and Norway (Miiller and others), to the south-west of France (De Folin, Fischer), Vigo (McAndrew) : 5-650 f. St. Margaret's Bay, Nova Scotia (Willis) ? Northern Asia and Japan (A. Adams). The tubercles or caecal extremities of the canals which permeate the shell are more numerous in this than in the next species (T. septata), and are arranged in wavy lines. The gradual development of the skeleton or apophysary process in both species is very remarkable, and has been admirably shown by Herr Friele of Bergen in a series of figures which accompany his papers on the subject in the 'Vidensk. Selsk. Forh.' for 1875, pl. i. fig. 9, a-i, and 'Archiv for Mathematik og Naturvidenskab' for 187 7, tab. i.-iii. Mr. Charles Moore had also, in 'the Geologist' for 1860, described and illustrated certain modifications in the loop of a fossil species, Terebra-tella buckmanni, which are not less important in respect of the classification of the Brachiopoda. The skeleton of a young Megerlia truncata, and probably of every other jointed Brachiopod, is different from that of an adult specimen. In the second volume of m y work on British Conchology, p. 14, I stated that the lower valve in the young of T. cranium is " furnished with a very distinct and prominent crest or ridge, placed inside and nearly "in the middle of this valve," and that the same character " likewise occurs in T. septata, Philippi, a Sicilian fossil (T. septigera, Loven), and is remarkably developed in that species ; but the foramen is incomplete in T. cranium, and entire in T. septata." I now find, on further examination of my Shetland specimens, that some of those which I had taken to be the young of T. cranium really belong to T. septata; and consequently the latter species is an inhabitant of our own coasts as well as of the Norwegian |
