48 
distinguishes this species from the Rhynchonella senticosa. 
He gives several localities. 
d’Orbigny, (Prodrome, 1850,) Terrains Jurassiques 10th 
Etage, gives Hemithiris spinosa, d’Orb. from Falaise, Port- 
en-Bessin, Moutiers, and Draguignan, in France. He does 
not describe this species, but refers to Phillips, pi. 9, fig. 18; 
Zieten, pi. 44, fig. 1; De Buch, 1834; Mem de la Soc., geol. 
3, p. 161, pi. 16, fig. 4. 
Hemithiris codata d’Orb., “ Espece ornee d’une vingtaine 
de cotes anguleuses, sur le sommet desquelles sont des 
epines tubuleuses, comme celles de la H. spinosa. (Localities) 
Grueret, (Sarthe,) Port-en-Bessin. 
Also from his 13th Etage, he records Hemithiris senticosa , 
d’Orb. {Ter eh. senticosa Schloth, 21 senticosa He Buch. Terehratula 
spinosa Zieten, 1830. TFurt, pi. 44, fig. i., France, Chatel-bensoir, 
Grange-Che val, Apremont pres de Mantua, Tuzennecourt 
(Haute Marne). Germany, Grumbaeh pres d’Amberg.) He 
gives no description. It will be noticed that he follows von 
Buch, in referring Zieten’s figure of Terehratula spinosa to 
Hemithiris senticosa , although he had before referred it 
to his II. spinosa ; he gives von Schlotheim’s and von Buell’s 
German locality for his Hemithiris senticosa. 
W e now come to Davidson’s (t Oolitic and Liassic Brachiopoda 
Paleeontolgrapliical Society, 1851,” and find Rhynchonella spinosa 
and a so-called Rhynchonella senticosa , fully figured and described 
from the Inferior Oolite, Plate xv., figure 15—20 and 21, 
pages 71—74. It will afterwards be seen that we have had to 
give another specific name to the Rhynchonella senticosa figured 
here. 
Quenstedt (Der Jura, 1858, Table 58, figure 21—27, page 
426) figures and describes several varieties of Terehratula 
spinosa ; but as only one view is given the figures are not 
sufficient. He however does not admit R. senticosa as an 
Inferior Oolite species, but says u Yon Schlotheim’s senticosa 
rede ich hier noch nicht, da der Name auf eine Form des 
obern Weissen Jura angewendet ist,” He gives a much better 
figure in Petrefakten Eunde, Zweite Auflage, 1867, Table 46, 
figure 37. 
