46 THE VOYAGE OF H.M.S. CHALLENGER. 



Terebratellafrielii, n. sp. (PI. III. figs. 19, 20). 



Shell small, ovate, slightly longer than wide, smooth, white. Dorsal valve moderately- 

 convex, slightly flattened or depressed anteriorly. Ventral valve deeper than the dorsal one. 

 Beak short, truncated by an incomplete foramen, laterally margined by two very short 

 and small deltidial plates. In the interior of the dorsal valve, the loop, which extends 

 to about two-thirds of the length of the valve, is doubly attached, first to the hinge-plate, 

 and again to a mesial septum. Length 10, width 9, depth 5 mm. 



Habitat. — Two small specimens (PI. III. fig. 19) were dredged off Halifax by 

 the Challenger Expedition, at Station 47, lat. 41° 15' N., long. 65° 45' W., on 

 May 7, 1873. Depth, 1340 fathoms. Sea bottom, mud. Two other examples (PL 

 III. fig. 20), which seem to belong to the same species and of the same proportions, were 

 likewise dredged by the same Expedition, at Station 201, on October 26, 1874, 

 close to the Philippine Islands, in 82 to 102 fathoms. Sea bottom, gravel and stones. 



Observatio7is. — I have felt much uncertainty with respect to the identification of the 

 two small immature shells from off Halifax above described, the only ones brought back 

 by the Challenger Expedition. I forwarded one of them to Mr Dall for examination, and 

 he wrote back that he could not positively identify it with any of the described species. 

 Mr Jeffreys expressed a similar opinion, adding that the septum and coecal tubercules are 

 very peculiar and remarkable, and that he felt certain that it is an undescribed species of 

 Terebratella. Two other similarly shaped and sized shells were likewise dredged by the 

 same Expedition (fig. 20) off the Philippine Islands, and which I could not distinguish 

 from those obtained off Halifax. 



I have, therefore, much pleasure in naming this species after Herr Herman Friele, 

 of Bergen, Norway, whose series of elaborate observations, with respect to the modi- 

 fications assumed by the loop in Waldheimia cranium and Waldheimia septigera, 

 as seen in the fry and up to the fuU-grown condition, are worthy of much com- 

 mendation. 



Magasella, Dall. 



Magasella jlexuosa, King, sp. (PL IV. fig. 5, a, b, c). 



Terebratula flexnosa, P. P. King, Zool. Joiu'., vol. v. p. 337, 1835 ; So-n^., Thesaurus Concli., parts 



6 and 7, p. 347, pi. Ixix. figs. 23, 24, 1846. 

 Terebratella Jlexuosa, Dav., Classification of the Eecent Brachiopoda, Ann. and Mag. of Nat. Hist., 



vol. ix. p. 367, 1852; and Gray, Brit. Mus. Cat., p. 87, 1853. 

 Terebratula magellanica, L. Eeeve, Conch. Icon., Mon. of Terebratula. (Not of Chemnitz.) 

 Magasella Jlexuosa, Dall, Am. Jour, of Conch., part 2, p. 135, 1870, and Cat. of Eecent Brach., Proc. 



Phil. Acad. Nat. Sciences, p. 189, 1873. 



Shell somewhat subtetragonal, about as wide as long, yellowish or light reddish- 

 brown. Dorsal valve moderately convex, mesially longitudinally depressed from about 



