FKOM IfOETH AMEEICA, WALES, AND IRELAND. 19 



These slightly differing forms may require a varietal name ; Dr. 

 Hall's " PUSTULOSA " precedes that given by Herr E-euter, and can 

 be retained. 



Our specimen, labelled " Beyricliict pustulosa : Arisaig, Kova 

 Scotia," is a sandstone cast of the inside of a right valve, coated 

 with hsematite. It lies on a small piece of fine-grained micaceous 

 sandstone, almost wholly stained red, but whitish here and there. 



10. Beyeichia hamiltonensts, sp. nov. (PI. II. fig. 3.) 



Size: length 1-66 mm., height "93 mm. 



Suboblong, straight on the back, elliptically rounded below ; 

 multilobed, the middle lobe isolated and oblique ; anterior lobe 

 forked by a vertical sulcus ; posterior lobe similarly furcate, but 

 not so deeply, and passing downwards and forwards (broken) to a 

 swollen portion just at the middle of the ventral region. All the 

 surface is pimpled, some of the granulation becoming sharp and 

 prickly at the dorsal region. This is distantly allied to B. duhia, 

 Renter, Zeitschr. D. g. Ges. vol. xxxvii. p. 648, pi. xxvi. fig. 22, 

 and remotely to B. tubercidata, Eoll, which may be taken as the 

 central form of a large group of these Ostracoda. 



B. hcuniltoiifMsis is so-called from its belonging to the Hamilton 

 Division of the Devonian Series in the United States. It came 

 from Eighteen-mile Creek, Lake Erie Shore, N.Y. 



11. Beyeichia* ciliata, Emmons. (PI. III. figs. 12 «, 6, 13 rt, h, 



14 a, 6, 15 «, 6, 16 ; PL IV. figs. 16 a, b, 17 a, h, 18 a, h.) 

 Beyrichia ciliata, E. Emmons, * American Geology,' vol. i. pt. 2, 



1855, p. 219, fig. 74c (right valve); 'Manual of Geology,' 2nd 



edit. 1860, p. 100, fig. 90. 



B. tumifrons. Hall, ' Twenty-fourth Report State N.Y. Mus. W. H.' 



1871-72, p. 231, pi. viii. fig. 11 (right valve) ; Report Geol. Survey 



Ohio, vol. ii. pt. 2, 1875, p. 102, pi. iv. fig. 8 (right valve). 



Length. Height. 



Thick- 

 ness. 



mm. mm, mm. 



f PI. III. fig. 12 ; PI. IV. fig. 16 . . 1-53 -86 -6 



I fig. 13; fig. 17.. ]-7 1-06 (with flange) -66 



Size^ fig. 14; fig. 18.. 1-6 I'O do. -6 



I fig. 15 1-56 -93 do. -53 



l^ fig. 16 1-6 -86 (no flange) 



Valves suboblong, ends rounded unequally, but almost parallel ; 

 in some cases upright or nearly so (PI. III. figs. 13 a and 15 a); 

 sometimes obli(}uc from above downwards and backwards (Pi. III. 

 fig. 14a); dorsal edge straight, with a long hinge-line; ventral 



* Mr. E. O. Ulrich proposes to find a more conyeuient generic group for 

 this and some allied forms. 



n 9 



