80 REPORT— 1884. 



front border. Original length about 24 mm., width 15 nam. Slope of 

 nuchal suture 30°. 



From the Coniston mudstone (Upper Silurian) of Skelgill Beck, 

 near Ambleside, Westmoreland (at the lower foot-hridge). Collected by 

 Mr. J. E. Marr, F.G.S. 



6. Discinocaris congener (Clarke), 1884. Spatlnoca.ris {Carcliocaris?) 

 congener, Clarke, 'Neues Jahrb. fiir Min.' &c, 1884, vol. i. p. 183, pi. 

 4, i. 5. 



This also seems to be a Discinocaris. Shield, when complete, elliptical- 

 oblong ; in the fossil state deeply notched at the anterior end, leaving on 

 each side a narrow tapering projection. Mr. Clarke says that the fossil 

 is 14 mm. long and 8 mm. broad. The slope of the notch seems to be 

 about 65°. 



From the Upper Devonian, at Bicken, near Herborn, Nassau. 



7. Discinocaris? gigas, H. Woodward, 1872, ' Geol. Mag.,' vol. ix. 

 p. 564 ; ' Report Brit. Assoc' for 1872, 1873, p. 323. 



A sub-triangular fragment of a Phyllopodous shield, showing delicate, 

 concentric, parallel lines, was referred in 1872 by Dr. H. Woodward to a 

 Discinocaris, possibly ' 7 inches in diameter.' This was from the Moffat 

 Graptolitic shale at Dobbs Linn, Dumfriesshire. It is in the British 

 Museum ; also an oblong fragment with fine parallel lines. Some relics 

 of body-rings, 45 mm. in transverse width, and varying from 5 to 10 mm. 

 fore and aft, from the same beds at Ettrickbrigend, Selkirkshire, are 

 in the same collection. 



At Cambridge two fragments of the same large kind of carapace are 

 in the University Museum, from the Conistone mudstone of Skelgill 

 Beck. Collected by Mr. J. E. Marr, F.G.S. 



Discinocaris. 



Discinocaris Browniana .... Lower or Middle Silurian. 



„ dubia (in Goniatite beds) . Upper Devonian, Hartz. 



„ lata „ . Upper Devonian, Eifel and Nassau. 



„ triasica Trias, Hallstadt. 



„ sp. nov. ..... Upper Silurian, Westmoreland. 



„ congener (in Goniatite beds) . Upper Devonian, Nassau. 



„ ? gigas Lower and Upper Silurian. 



II. SpATHioCARts, J. M. Clarke, 1882. • American Journ. Science,' ser. 3, 



vol. xxiii. p. 477, and vol. xxv. p. 120, and pp. 124, 125. ' Neues 



Jahrb. fiir Min.' Ac, 1884, vol. i. p. 181, &c. 



Judging from Mr. Clarke's description and figures, this Phyllopod 



seems to have an oblong or obovate, snbconical, patelloid shield, with a 



narrow anterior or cephalic notch (referred to as being posterior, loc. cit., 



but apparently as anterior in the 'Neues Jahrb.' loc. cit.), reaching back 



halfway along the shield, ornamented with concentric lines, and, in some 



specimens, with delicate radii also. In essential particulars this agrees 



with Discinocaris l (if regarded as described above) ; but its notch is 



peculiar, being very narrow. 



1 Mr. Clarke, at p. 478, comparing this form with Discinocaris, speaks of the wedge- 

 shaped cleft as being analogous to the notch of the latter, but says that there is here 

 no 'rostrum or plate acting as another valve to cover the cleft,' and he evidently 

 regarded the notch as abdominal, somewhat like the posterior hollow in the shield of 

 Ajnts, to allow of the protrusion of the abdomen {see also ' Amer. Journ. Science/ 

 ser. 3, vol. xxv. p. 124). In the 'Neues Jahrb.' 1884, however, Mr. Clarke refers to 

 the notch as being anterior, but figures it downward in the plate. 



