ISO "TERRA NOVA" EXPEDITION. 



1 1 -DESCRIPTION OF SPECIES. 



The literature is restricted to the more important works. 



A. NEW ZEALAND. 



LIST OF STATIONS. 



Station 90. From Summit, Great King, Three Kings Islands, S., 14 W., 8 miles, 100 fathoms. Surface 



temperature, 59'21F. 



96. 7 miles E. of North Cape, New Zealand, 70 fathoms. Surface temperature, Gl F. 

 ,, 243. Neighbourhood of Admiralty Bay, Nelson, New Zealand, 15 fathoms, sand. 

 ? On the sandy beach at Waikawa, Southland, New Zealand, 1912. 



1. Hemithyris nigricans (G. B. Sowerby, 1846). 



Terebratida nigricans, Sow., Proe. Zool. Soc., 1846, p. 91. 



Sow., " Thes. Conch.," i., 1846, p. 342, pi. 71, figs. 81-82. 

 Rlnjiulionella nigrirans (Sow.), Davidson, "Recent Brachiopoda," Trans. Linn. Soc., iv, pt. ii, 



1887, p. 169, pi. 24, figs. 16-19. 

 HemitJiyris nigricans (Sow.), Dall, Proe. AcarL Nat. Sci. Phtlad., 1873, p. 196. 



Suter, "Manual N.Z. Mollusca," 1913, p. 1076. 



Jfab. "On the sandy beach at Waikawa, Southland, N.Z., 1912" [ = 0tago]. 



Ohs. Three live specimens of this well-known New Zealand form were picked up 

 at the above locality. The largest example measures : length, 22 mm. ; breadth, 

 25 mm. ; depth, 12 '5 mm. 



This species seems to be restricted in its distribution to the southern part of New 

 Zealand. It has been recorded from 5 miles E. of Kuapuke Island, 19 fathoms; 

 Foveaux Strait (abundant); off Waipapa Point, 24-26 fathoms; 15^ miles E. of 

 Shag Point, 30-40 fathoms, and the Chatham Islands [Button, 1873 (1), p. 87 ; 1880, 

 p. 178. Davidson, 1887, p. 169. Suter, 1911, p. 284, and 1913, p. 1076]. 



In a fossil state the species is said to occur in the Tertiary Rocks of New Zealand 

 [Huttou, 1873 (2), p. 37; 1904, p. 480; Suter, 1913, p. 1076]; but it is open to 

 question whether the specimens so named are correctly referred to //. /////nci/ii,^. They 

 probably represent a coarsely ribbed, imbricate, ancestral form of which the recent 

 //. niiirii-nns may be a catagenetic development, and the recent //. doderleini, from 

 Japan, a spiuose (anagenetic) development [Thomson, 1915 (3), p. 388]. A closely 

 related form has been obtained from the Table Cape Beds at Wyuyard, Tasmania, 

 reputed to be of Miocene Age [Jackson, 1916, pp. 25-26]. 



Compared with the genotype of Ili'mitlii/ri* (H. psittacea), //. i<!i/rir<ins presents 

 some interesting internal differences. The dental plates, instead of being vertical as in 

 H. psittacea* (also II. lm-i<l<i), curve backwards into the umboual cavity. The teeth, 



* Thomson [1915 (3), p. 391] has recently called attention to the erroneous statements made by Hall 

 and Clarke [1895, p. 835J and Schuchert [1913, p. 31I9) that dental plate -i are absent in this genus. In 

 gerontic examples of H. pglttucea the dental plates tend to become obsolete (J. W. J.). 



