180 F. Chapman and Irene Crespin : 



^re of the Jurassic type, which eventually passed into the type, 

 Tegulorhynchiki — " nigricans series " — of the Cainozoic and recent 

 .deposits of Australia, New Zealand, Patagonia and Antarctica. 



(f). — Evidence of Bathy metrical Habitat. 



The majority of the living brachiopods are, as Schuchert has al- 

 ready pointed outu, deep water and abyssal, and they are practically 

 .all thin-shelled. 



The present habitat of the living Tegulorhyncliia nigricans gives 

 a good idea of the probable average depth of the earlier tegulate 

 forms, having a similarly thick shell. It has been recorded 5 miles 

 east of Ruapuke Island in 19 fathoms, on rock and coral; also from 

 •Chatham Island. The range given by Canon Norman for the boreal 

 Hemithyris psittacea is 10-690 fathoms, at Shetland and near the 

 Dogger Bank. Reeve gives the range from low water to 100 fathoms. 



In regard to the living form, T. doedei'leini, this was dredged in 

 about 160 fathoms. 



Fischer, in his Manually separates the zone of Brachiopods and 

 Corals, as occurring from 72 to 500 metres in depth (36-250 fathoms). 

 He quotes Macandrew, who dredged Hemithyris psittacea from near 

 Finmark, at a depth of 121 to 165 fathoms, in sand. 



The group' of the genus Tegitloi^hyncliia, now discussed, is, gene- 

 rally speaking, thick-shelled. Moreover these forms are associated 

 with shore-loving forms, as at Keilor, near Melbourne, and Table 

 Cape, Tasmania; or in fairly deep water limestones, as at Batesford, 

 near Geelong. In the former case the shells are typically incrassate, 

 whereas in the deeper water habitat they are slightly thiner in build. 

 Instances of the genus in still deeper habitat are found at Fishing 

 Point, Cape Otway, and in the Lower Muddy creek beds. 



JV.— Description of the Species of Tegulorhynchia. 



1. — Tegulorhynchia squamosa, Hutton, sp. 

 (PI. I., figs. 1, 2; pi. II., fig. 22; pi. III., fig. 26.) 



Rhynchonella squamosa, Hutton, 1873, p. 37. 



Hemithyris squam.osa, Hutton, sp., Buckman, 1910, p. 10, pi. 



I., fig. 13. 

 Hemithyris squamosa, Hutton, sp., Thomson, 1918, pp. 108 

 and 117. 

 Description. — " Shell irregular, more or less orbicular; valves 

 inequal, the ventral flatter, and with a deep groove; dorsal valve 

 very convex; both with find radiating scaly striae. Length, .7 mm.; 

 breadth, 7.5 mm.; height, .5 mm." 



Observations. — From a topotype which has been kindly presented 

 to the National Museum by Dr. J. A. Thomson, we note that this 



11. Schuchert, 1911, p. 226. 



12. Fischer, 1887, p. 188. 



