116 



LINGULELLA, Salter, 1861.* 



Characters of When first studying Lingulella Selwyni^ with much more defective mate- 

 rial than has since been obtained,** it had seemed to the writer that 

 there was a close relationship between the Russian species 0. Quenstedti 

 and species of the genus Lingulella. Messrs. Hall and Clarke had 

 noticed the same.f Since then Michwitz has identified 0. Quenstedti 

 with 0. Apollonis, the type of the genus Obolus, as a variety. J At a 

 still later date, Director Walcott, of the U. S. Geological Survey, has 

 followed up this line of investigation and has referred all Lingulellas to 

 Obolus, as belonging to a subgenus of the latter. ft 



In support of this view, Mr. Walcott has marshalled much new evid- 

 ence showing the close alliance between these two genera, but still to the 

 writer there are objections to fusing the two. In the following descrip- 

 tion of the characteristics of L. Selwyni more complete than was possible 

 a few years ago, some of these differences will appear, and this is a species 

 desirable to use in this way, as it is particularly oboloid in aspect, from 

 its broad cardinal area in the dorsal, its depressed beak, and other 

 features. The horizon to which it belongs is far below that assigned to 

 L. Davisii, the type of the genus Lingulella, and if one may judge by 

 Salter's description of that species, this was smaller and deeper in the 

 valves. 



The types of Brachiopods which the writer in former articles has referred 

 to Lingulella, in this report, he has divided into three groups Lingulella, 

 Salter Lingulepis, Hall, and Leptobolus, Hall. The characters under 

 which the two latter are separated are described under the two genera named 

 and need not here be repeated or anticipated. Species, however, still remain 

 under Lingulella, which are closely related to one or other of the above 

 two genera (or sub-genera), that do not fully embody all the characters 

 assigned to those two genera. Such forms are here still retained under 

 Lingulella. 



LINGULELLA SELWYNI PI. VII, figs. lo-c. 



Linguella Selwyni, n. sp. Trans. Roy. Soc. Can. 2d ser. vol. 1, pi. i, figs. 1 

 a and b. 



*In Memoirs Geolog. Surv. of Gr. Britain, vol. iii, 1880, p. 537, this genus appears to be 

 accredited to S. Woodward, by Salter. 

 t Genera Palaeozoic Brachiopoda, p. 337, figs. 38 and 39. 

 JMem. Imp. Acad. Sci. St. Petersb. Ser. 8, vol iv, No. 2, p. 79. 

 **Trans. Roy. Soc. Can., 2nd Ser., vol. i, sec. iv., p. 256. 

 ttProc. U. S. ]Sat. Mus., p. 390. 



