Gesell. 1879, Pag. 269) har udtalt nemlig, at Slægten Lyon- 
cella, M. Sars bør opretholdes og at Dr. Jeffreys med 
urette sammendrog denne Slægt med Pecchiolia, Menegh. 
Brachiopoda. 
Terebratula (Liothyris) arctica, Fr. 
Tab. XII, Fig. 17, 18 a, 3. 
T. arctica, Friele, ,Jan Mayen Moll.“ Nyt Mag. XXIV, 
1878, Pag. 221, Fig. 1 a—c. 
Skallen oval, lig 7. minor, dog forholdsvis kortere, 
Rostrum kort, Foramen complet, men svagt. Deltidium 
bliver næsten skjult under den hoemale Skals Umbo. Apo- 
physis svag. 
Størrelse: 
Forekomst: 
{42m lang, [2.5mm bred, Qmm tyk. 
St. 237 (Jan Mayen) 263 Favne. 
Fra Terebratula vitrea var. minor, Phil. adskiller vor 
Art sig ved at være forholdsvis kortere, mere kantet af- 
rundet og mere globos. Dertil er Rostrum kortere og 
Løkken syagere. 
Dr. Jeffreys reducerte denne Form til en Varietet af 
Terebratula vitrea, men den fortrinlige Brachiopodekjender 
Dr. Ths. Davidson finder, at den bør opretholdes som god 
Art. Strax før sin Død skriver han til mig: ,I deter- 
mine, contrary to Dr. Jeffrey’s opinion, to retain your species 
as distinct.“ 
39 
Mall. Gesell. 1879, pag. 269) viz. that the genus Lyonciella, 
M. Sars, ought to be maintained, and that Dr. Jeffreys, 
erroneously includes that genus with Pecchiolia, Menegh. 
Brachiopoda. 
Terebratula, (Liothyris) arctica, Fr. 
Teas SAM sabes, IG, US} eg WA, 
T. arctica, Friele, ,Jan Mayen Moll.“ Nyt Mag. XXIV, 
1878, pag, 221, fie. ae 
Shell oval, resembling that of T. minor, but relatively 
shorter; rostrum short; foramen complete, but faint. The 
deltidium is nearly concealed under the hæmal shell’s umbo; 
apophysis faint. 
Size. Length, 147”, Breadth, 12.57”, 
Habitat: 
263 fathoms. 
Our species differs from Terebratula vitrea, var. minor, 
Phil. in being, relatively, shorter, more squarely rounded 
and more globular. Further, the rostrum is shorter and 
the loop fainter. 
Dr. Jeffreys reduced this form to a variety of Tere- 
bratula vitrea, but the eminent Brachiopodist Dr. Thos. 
Davidson considered that it ought to be maintained as an 
independent species. Immediately prior to his death, he 
wrote to me in these words ,,I determine, contrary to Dr. 
Jeffrey’s opinion, to retain your species as distinct.“ 
Thickness, 8””, 
Station, No. 237 (Jan Mayen). Depth, 
