THE BRACHIOPODA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 157 



The well-preserved examples fortunately possessed the dried-up remains of the 

 brachise and other parts of the animal, by means of which a study of the spiculse has 

 been made possible. 



These latter bodies are entirely absent in the cirri as well as in the visceral 

 membrane. In the arms the spiculse are very feebly developed and restricted to the 

 hinder portion of the dorsal side. 



This species has some resemblance externally to some forms of the Magellanic 

 LiothyriiiBe referred to L. uva, but differs entirely from these in the extreme 

 thinness of the adult shell, the smaller number of pores per square millimetre, and 

 the difference in the form of the brachial support and the spiculse of the arms. 



Owing to the many differences existing between this form and other known 

 Liothyrinae, I venture to describe it as an entirely new species, to which I have very 

 great pleasure in attaching the name of Professor F. BLOCHMANN, of Tubingen, to whom 

 all students of recent Brachiopoda are so much indebted. 



Macandrevia diamantina, Dall. (PL II. figs. 15-19.) 



Ball, 1895, Proc. U.S. Nat. Mus., vol. xvii. p. 723, pi. xxx. fig. 5; pi. xxxii. figs. 3 and 6. 

 1908, Bull. Mut. Comp. Zool. Harv. Coll., vol. xliii. p. 443. 



. Station 417; lat. 71 22' S., long. 16 34' W. (off Coats Land), 1410 

 fathoms. March 18, 1904. Sea bottom, blue mud and stones. Temperature 29 - 9 F. 



Obs. A fair number of living adult examples of this interesting species were 

 brought up in the trawl at the above station. Along with these were a few dead 

 examples, badly broken, and a quantity of small fragments which would point to the 

 fact that a large number of specimens had been broken up by the numerous pebbles 

 in the trawl net. 



All the living examples were closely attached by their peduncles to pebbles of 

 granitoid and other rocks, the pebbles varying in size from that of a hazel-nut to that 

 of a walnut (see PL II. fig. 15). Some of the pebbles, especially the smaller ones, are 

 worn almost round, while others are somewhat angular. However large the size of 

 the pebbles, only one example of this species was observed on each. In several 

 instances tubes of Serpulse are present on both valves. 



The specimens are very uniform in size and show no appreciable variation in shape. 



Sizes of some of the specimens : 



20-5 15-5 10 



I am quite unable to separate the Antarctic form from BALL'S species, as it agrees 

 word for word with his description (op. cit., p. 723). 



(ROY. soc. BDIN. TRANS., VOL. XLVIII., 379.) 



