

84 iiEroHT— 1884. 



posterior third, notclicd deeply in front in the fossil state hy loss of tho 

 rostral portion; more or loss truncate, and often indented posteriorly. 

 This modification of tho posterior extremity is regarded by Mr. J. M. 

 Clarke as of only specific valne ; but with us it constitutes the differenco 

 between Cardionu-in and Ih'uriiu .ari^, and tho indentation leads us to tho 

 cleft posterior margin of Viptr.rnmris. 



1. Cari1ii.can.-< I : onrie rl, li. Woodward, 1882. ' Geol. Mug.' Dec. 2, 

 vol. ix. p. 380, pi. 0, figs. 1-7. 



Shield long-obovate, slipper-like. Cephalic portion narrow-triangular, 

 about In mm. long in a shield 40 mm. long. Good specimen IJ5 mm. long 

 (about 45 mm. wlicii mnipleto), 20 mm. in greatest bi'eadth. Fragment 

 of larger shielil, probably once 05 mm. long and 40 mm. wide. Another 

 may have been r>()rani. broad and !J0 mm. wide. Some small (young) 

 forms, one of them not more than G mm. long and 4 ram. broad, aro also 

 figured. Slope of nuchal suture at about 60°. In one small specimen 

 tho cephalic portion is preserved in place (op. cif. p. '.\S7 and f. 5). The 

 presence of this little frontal piece is quite antagonistic to tho adaptability 

 of Cnnliocaris as an operculum to a Goniatite. 



Upper Devonian or the Eifel, at Biide.sheim, between Gerolstein and 

 Priira. 



2. Cardlocaris hipartita, H. Woodward, 1882. 'Geol. Mag.' Dec. 2, 

 vol. ix. pp. 383, 388, pi. 8, figs. 14 and 15. 



One of those (f. 14) is much like G. Boevwri in shape, but is said to 

 have a dor.sal suture, in which case it ought to be placed in or near 

 Aptycliopsis ; probably, however, tho dorsal line was merely tho mark of 

 an imperfect fold or break along tho middle (as in Mr. Clarke's figure of 

 Spaihiwariit Koeiicnl, ' Neues Jahrb.' 1884, vol. i. pi. 4, f. 1). Tho .side- 

 margins are rather less convex than in G. Jioemeri, and the hinder end, 

 •which is indented, is proportionally broader. Complete, it may have been 

 27 mm. long, by 15 mm. wide. Angle of nuchal notch, G0°. 



In shape, f. 15 (which is imperfect posteriorly) differs from f. 14 ; it 

 seems to be more oval, and is certainly more deeply notched in front 

 than f. 14. It was probably 32 mm. long, when complete ; 17 mm. wide. 



Both the specimens were found in the Upper Devonian at Biidesheira, 

 between Gerolstein and Priim, in the Eifel. 



3. Cardiocaris Veneris, H. Woodward, 1882. ' Geol. Mag.' 1882, p. 387, 



pi. 8, figs. 8-12, 

 Shield relatively broader and shorter than C. Roemeri, and consider- 

 ably wider in front than behind. The cephalic notch is also relatively 

 broader. Dr. Woodward gives the following measurements : — 



licngth (complete), about 30 mm. ; greatest breadth, 23 mm. 

 »> ji "0 ,, ,, lo 



»i »••«•" >i 



» 10 



The angle of tlie slope of the nuchal furrow is uncertain ; it varies in 

 different specimens, according to the result of pressure and disturbance, 

 40° and 45°, 45° & 55°, and 60° and 65°. 



4. Cardiocaris Koeneni (Clarke), 1844. 



Spathiocaris Koeneni, Clarke, ' Neues Jahrb. fiir Min.' &c., 1884, vol. i. 

 p. 182, pi. 4, f. 1. 





