80 



REroRT — 1884. 



front border. Original length about 24 mm., width l.' mm. Slope of 

 nuchal suture '{0°. 



From tho Coiiiston nmdstono (Upper Silurian) of Skclgill IJccrk, 

 near Ambleside, Westmoreland (at tho lower foot-bridge). Collected bj 

 Mr. J. E. Marr, I'MI.S. 



G. Dlsrhiornrin nnirjrncr (Clarke), IHH-t. SpathiornriH (Cardioraris ?) 

 convener, Clarke, 'Nencs Jahrb. fiir Aliii.' &.c., 1884, vol. i. p. 183, pi. 

 4, f. T). 



This also seems to be aJ^lschwraris. Shield, when complete, elliptical- 

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

 each side a nn'-.cw tapering projection. Mr. Clarke says that the fossil 

 is 14 inm. long and H mm. broad. The slope of the notch seems to l)e 

 abont C)o°. 



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



7. Discinocariii / qlqas, H. Woodward, 1872, ' Geol. Ma'.;.,' vol. ix. 

 p. 5G4 ; ' Report Br\i. 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. IF. Woodward to u 

 Discivncnris, 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 line parallel lines. Some relics 

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

 fore and aft, from tho same beds at J'Jttrickbrigend, Selkirkshire, arc 

 in the same ooUection. 



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

 in tho University Museum, from tho Conistone mudstone of Skelgill 

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



DiSCIXOCARIS. 



JJittcinocfirin lirflrvniana .... I.owor or Middle Silurian. 



Upper Devonian, Hartz. 

 Upper Devonian, Kifel and Nassau. 

 Tins, Ifallstadt. 

 Upper Silurian, Westmoreland. 

 Upper Devonian, Nassau. 

 Lower and Upper Silurian. 



dnhia (in CJoniatite beds) 

 lata „ 



tfianica .... 



sp. nov 



ro/iffeiirr (in Goniatitc beds) 

 I'giffan .... 



II. SpATHiocAnrs, J. M. Clarke, 1882. 'American Journ. Science,' sor. .'!, 



vol. xxiii. p. 477, and vol. x.xv. p. 120, and pp. 124, 125. ' Noues 



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



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



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



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



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



halfway along tho shield, ornamented with concentric lines, and, in .sonic 



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



with Discinocans ' (if regarded as described above) ; but its notch is 



peculiar, being very narrow. 



' ^Ir. Clarke, at p. 478, comparing: this form with Dixchiocarix, sjioaks of llie 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 lie evidently 

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

 Apus, to allow of the protrusion of the abdomen (xw also ' Amer. Journ. Science,' 

 fCT. ;J, vol. XXV. p. 124). In the 'Neues Jahrb.' 1884, linwcver, Mr. Clarke refers to 

 the notrh as being anterior, but ligures it downward in the plate. 



