THE BRACHIOPODA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 161 



on the West I'atagonian coast ; while Liothyrina v.va also extends from the Gulf of 

 Panama to the Antarctic. 



As a similar, and, in fact, parallel instance of wide distribution in another group of 

 animals, I might mention the case of Dentalium megathyris, Dall {=D- fihoplandi, 

 M. and S., non Jouss.). 



This interesting scaphopod was dredged along with another new species 

 {D. eupatrides, M. and S.) at the same station and depth (Coats Land, 1410 fathoms). 

 It has been met with in deep water at several stations on the western coast of Central 

 and South America, viz. off Chiloe Island, and South-East Chili, in 1050 and 1342 

 fathoms; near Galapagos Island in 812 fathoms; off Ecuador in 1740 fathoms; Gulf of 

 Panama, .south-west of Tehuantepec, in 2282 fathoms; off Mazatlan in 995 fathoms. 



TerehrateUa dorsata (Gmelin). (PI. II. figs. 11-13.) 



Anomia dorsata, Gmelin, 1788, Syd. nat., ed. xiii., p. 334S. 



TerehrateUa dormta (Giiiolin), 1887, Davidson, Mon. Recent. Brack., p. 75, pi. xiv. figs. 9-11, 13-19 



(fig. 12 looks like a young Magellania venosa). 

 1889, Dall, Proc. U.S. Nat. Mm., vol. xii. p. 231. 

 ,, ,, 1892, Fischer and Oehlert, Bidl. Soe. d'hist. nat. Autun, vol. v. p. 272, 



pi. ix., X., xi., figs. 1-6. 

 „ „ 1908, Dall, Bull. Mus. Comp. Zool. Hanard Coll, xliii. p. 414. 



1909, Dall, Proc. U.S. Nat. Mus., vol. xxxvii. p. 279. 

 ,, „ \'d\2, 'Blochvaann, Die Brack, de)' Schwed. S.-P. Expedition, Bd. vi. 



(Zoologie ii.). No. 7, Stockholm, p. 11. 



^«6.— Station 346; lat. 54' 25' S., long. 57° 32' W. (Burdwood Bank), 

 56 fathoms. December 1, 1903. Sea bottom, Bryozoa. Temperature 4r-8 F. 



Ohs. — Dead examples only of this well-known Magellanic species were obtained at 

 the above station. These consist, in most cases, of fairly perfect specimens ; in others, 

 of loose valves only. All are quite white in colour. 



The examples, for the most part, are representative of adult individuals, and are 

 interesting as exhibiting a considerable amount of variation, both in shape and size. 

 The smallest fully-adult example measures : length, 22 mm ; breadth, 23 mm. ; the 

 largest adult is : length, 38 mm. ; breadth, 36 mm. 



Several of the specimens dirter from the typical transverse form in being almost 

 round, and one example is curious in presenting quite an elongate appearance, calling 

 to mind the well-known Australian species, Magellania Jlavescens (PI. II. fig. 13). 



The beak is largely produced, recurved, as is usual, and truncated by a relatively 

 large foramen. (.)ne side of the specimen is somewhat distorted in growth, giving the 

 shell an asymmetrical appearance. The size of this specimen is : length, 25 mm. ; 

 breadth, 18 '5 mm. ; thickness, 12 "5 mm. 



In all the examples obtained the test is remarkably thick and, consequently, quite 

 opaque. The radiating ribs on the surface, vvlucli in most examples are also visible in 

 a reversed order in the interior, difier very largely in the various individuals, some 



(Roy. soc. edin. trans., vol. xlviii., 383.) 



