504 Dr. J. Allan Thomson—On the Terebratellide. 
Terebratula frontalis cannot be placed in Zerebratalia and requires 
a new genus for its reception, for which I propose: 
DiEstoTHyEIs, gen. nov. 
Genotype Terebratula frontalis, Middendorff. 
Diestothyris presents many of the characters that are to be expected 
in a forerunner of Jacandrevia, and differs only in its type of 
eardinalia. It may be provisionally regarded as belonging to the 
same stock as Macandrevia, although not in the direct line of descent 
of that genus. 
The above discussion shows that by taking into consideration 
characters of beak, hinge-teeth, and cardinalia in addition to loop 
characters, much may be done to arrange the recent species of 
the Dallinine into genetic stocks. The discussion is by no means 
exhaustive, and has not included the lower genera, for which a better 
knowledge of the Tertiary fossils of the Northern Hemisphere is 
desirable. 
List OF PAPERS CITED. 
BEECHER (C. E.). 1895. ‘‘ Revision of the Families of Loop-bearing 
Brachiopoda’’: Trans. Conn. Acad. Arts Sci., vol. ix, pp. 376-91, 395-9. 
BLOCHMANN (F.). 1910. ‘*‘ New Brachiopods from South Australia,’ in Verco 
(J. C.), ‘‘The Brachiopods of South Australia’’?; Trans. Roy. Soc. 
S. Austral., vol. xxxiv, pp. 89-99 (ref. to pp. 92-3). 
Buckman (S. S.). 1916. ‘‘Terminology for Foraminal Development in 
Terebratuloids (Brachiopoda) ’’: Trans. N.Z. Inst., vol. xlviii, pp. 130-2. 
Dawu (W. H.). 1895. ‘‘ Scientific Results of Explorations by the U.S. Fish 
Commission Steamer Albatross. No. XXXIV: Report on Mollusca and 
Brachiopoda dredged in Deep Water, chiefly near the Hawaiian Islands, 
with Illustrations of hitherto unfigured Species from Northern America ”’ : 
Proc. U.S. Nat. Mus., vol. xvii, pp. 675-733 (ref. to p. 722). 
Davipson (T.). 1886. ca Monograph of Recent Brachiopoda,’’ part i: 
Trans. Linn. Soc., ser. 11, Zool., vol. iv, pt. i (ref. to p. 62). 
DESLONGCHAMPS (H.). 1884. ‘ Notes sur les modifications a apporter 4 la 
classification des Terebratulide ’’: Bull. Soc. Linne Normandie, sér. 1m, 
vol. viii, pp. 161-297 (ref. to pp. 200-11, pl. vii, figs. 1, 2, 3, 4, 9, 11). 
FIscHER (P.) and OEHLERT (D. P.). 1891. Haxpeditions scientifiques du 
Travailleur et du Talisman, etc.: Brachiopodes. Paris. 
— 1892. ‘‘ Mission scientifiques du Cap Horn (1882-3), Brachiopodes’’ : 
Bull. Soc. d’hist. nat. d’Autun, t. v, pp. 254-334. 
HEDLEY (C.). 1905. ‘‘ Mollusca from One Hundred and Hleven Fathoms, 
east of Cape Byron, New South Wales’’: Rec. Austral. Mus., vol. vi, 
No. 2, pp. 41-54 (ref. to pp. 43-4, figs. 5, 6a-b). 
— 1911. ‘‘Commonwealth of Australia. Department of Trade and 
Customs—Fisheries: Zoological Results of the Fishing Experiments 
carried out by F.1.8. Hndeavour, 1909-10,”’ part i (ref. to p. 114, pl. xx, 
figs. 41, 42). . 
JACKSON (J. W.). 1916. ‘‘ Brachiopod Morphology: Notes and Comments 
on Dr. J. Allan Thomson’s Papers’’: GEOL. MaG., Dec. VI, Vol. III, 
pp. 21-6. 
ScHucHERT (C.). 1897. ‘‘A Synopsis of American Fossil Brachiopoda, 
including Bibliography and Synonymy ’’: Bull. U.S. Geol. Surv., No. 87 
(ref. to pp. 124-6). 
—— 1913. ‘‘ Brachiopoda,’’ in Eastman (C. R.), Text-book of Paleontology, 
Soi from the German of Karl A. von Zittel, 2nd ed., vol. i (ref. to 
. 404-5). 
Cone PR). 1880. ‘‘On the Australian Tertiary Palliobranchs’?: Trans. 
Roy. Soc. 8. Austral., vol. iii, pp. 140-69 (ref. to p. 161, pl. xi, figs. 7a-c). 
hi ttn ——,- 
