39 



Gesell. 1ST'.', Pag. 209) har udtaH nemlig, at Slægten Jjyon- 

 cidla, M. Sårs bør opretholdes og at Dr. Jeffreys med 

 urette sammendrog denne Slægl med Pecchiolia, Menegh. 



Brachiopoda. 



Terebratula (Liothyris) arctica, Fr. 



Tab. XII, Fig. 17, 1s a, b. 



T. arctica, Friele, ,.Jan Mayen Moll." Nyt Mag. XXIV, 



1878, Pag. 221, Fig. 1 a—c. 

 . Skallen oval, lig T. minor, dog forholdsvis kortere, 

 Rostrum kort. Foramen complet, men svagt. Deltidium 

 bliver næsten skjult under den hoemale Skals Umbo. Apo- 

 physis svag. 



Størrelse: 14""" lang, 12.5""" bred, 8""" tyk. 



Forekomst: St, 237 (Jan Mayen) 263 Favne. 



Fra Terebratula vitrea rar. minor, Phil. adskiller vor 

 Art sig ved at være forholdsvis kortere, mere kantet af- 

 rundet og mere globos. Dertil er Rostrum kortere og 

 Lokken svagere. 



Dr. Jeffreys reducerte denne Form til en Varietet af 

 Terebratula vitrea, men den fortrinlige Brachiopodekjender 

 Dr. Ths. Davidson tinder, at den bør opretholdes som god 

 Art. Strax for sin Dod skriver han til mig: „I deter- 

 mine, contrary to Dr. Jeffrey's opinion, to retain your species 

 as distinct.-' 



Mall. Gesdl. L879, pag. 269) viz. (hat the genus Lyonciella, 

 M. Sars, might to he maintained, and that Dr. Jeffreys, 

 erroneously includes that, genus with Pecchiolia, Menegh. 



Brachiopoda, 



Terebratula, (Liothyris) arctica, Fr. 



PI. XII, figs. 17, is a , h. 



T. arctica, Friele, „Jan Mayen Moll.-' Nyt Mag. XXIV, 



1878, pag. 221, fig. 1 a—c. 



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, 14""", Breadth, 12.5™", Thickness, 8 



Habitat: Station, No. 237 (Jan Mayen). Depth. 

 263 fathoms. 



Our species differs from Terebratula vitrea, rar. 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 Trrr- 

 bratula vitrea, but the eminent Brachiopodist Dr. Thos. 

 Davidson considered that it ought to lie 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." 



