THE BRACHIOPODA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 165 



BLOCHMANN (1912) has referred to one of these specimens in dealing with a 

 probably new species of Magellania obtained by the Swedish South- Polar Expedition 

 at the same locality (Burdwood Bank), and remarks on its correspondence with his 

 described example, with the exception that whereas the Scotia specimen possesses 

 a distinctly pronounced angulation of the beak, his Magellania specimen exhibits no 

 such character, the sides of the beak being well-rounded, without any indication of 

 an angle. 



From the thickness of the test he is inclined to regard the form as a possibly new 

 Terebratella. 



Magellania venosa (Solander). 



Anomia venosa, Solander, 1788, Dixoris Voy., p. 355, pi. xi. 



Waldheimia venosa (Sol.), 1886, Davidson, Mon. ReMni Brack., p. 49, pi. viii. figs. 1-5; 



pi. ix. fig. 1. 



Eudesia venosa (Sol.) 1889, Ball, Proc. U.S. Nat. Mus. vol. xii. p. 231. 

 Magellania venosa (Sol.), 1892, Fischer and Oehlert, Bull. Soc. d'hist. nat. Autun, vol. v. 



p. 312, pi. xi. figs. 7-16 ; pi. xii. figs. 1-17. 



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



,, ,, 1912, Blochmann, Die Brack, der Schwed. S.-P. Exped., Bd. vi. 



(Zoologie ii.), No. 7, Stockholm, p. 9. 



Hob. Station 346 ; lat. 54 25' S., long. 57 32' W. (Burdwood Bank), 56 fathoms. 

 December 1, 1903. Sea bottom, Bryozoa. Temperature 41 0< 8 F. 



Obs. Amongst the young examples obtained from Ceplialodiscus dredged at this 

 station are several which appear to be referable to the above species. One or two of 

 these examples are less than 3 mm. in length. 



One specimen, which measures 4 mm., shows 256 punctse per square millimetre; 

 another, 6 mm. long, shows a range from 240 to 256 punctse, both examinations being 

 made about the middle of the ventral valve. 



In M. venosa, according to BLOCHMANN (1912), the perforations per square millimetre 

 range from 240 to 280. 



The various specimens are interesting as showing some of the very early stages in 

 the development of the brachial support of this species, which were first made known 

 through the admirable work of FISCHER and OEHLERT (1892). 



The geographical range of M. venosa is very much the same as that of Terebratella 

 dorsata, with which it is often accompanied. 



It has been met with abundantly by many expeditions in the neighbourhood 

 of Tierra del Fuego (35 to 80 fathoms); Magellan Straits (7 to 20 fathoms), and 

 Falkland Islands, where the largest specimens, so far known, were obtained by Rear- 

 Admiral SULIVAN in 1843, near Fort William, in 6 to 7 fathoms (see pi. viii. 

 figs. 2 to 2c, DAVIDSON, Rec. Brach.}. 



The species is recorded also from the west coast of Patagonia (from 1 to 30 fathoms) 

 and from Coquimbo, Chili. 



(ROY. soc. EDIN. TRANS., VOL. XLVIII., 387.) 



