ON IllE FOSSIL rirVLLOPODA OF THE I'VLiKOZOlC HOCKS. 



■y 



In 



portion nearly one-sixlli of the entire circumference. A larp^or ppocimcn 

 folded tofretlier probably measured It lines iu diameter, ' Quart. Journ. 

 Geol. Soc.' vol. xxii. p. !ji)4. 



Found in tlio Anthracitic Sbalcs of the JIofTat district, at Dobbs Linn, 

 Dumfriesshire, iiud Giirpoolburn, Moll'at ; and iu equivalent Silurian beds 

 at Coalpit liay, co. Down, Ireland. 



2. Disciiidcaris dnhia (P. A. Roomer), 18')0. Aptiji-lms ihib!n/>, V. A. 

 Roemer ('Palncontoffraphica,' vol. iii. part 1, p. *2-\ t. 4, f. IH). Sputhio- 

 caris duhin, J. M. Clarke, ' Nenes Jahrb. fiir Min.' Ae., 1884?, vol. i. pp. 

 129 and 188. 



Nearly eireiilar when perfect, but Boraewhat narrowed posterioviy, 

 thus becoming' sliort-obovnte. ISoteh rather shallow. Originally about 

 25mm. long, 2 1 mm. at tlie widest; slope of nuch;d suture, 3U". Cor. 

 centric lines Avido apart, as ])reserved, and otherwise obscure at the 

 centre. This is referred by Mr. J. ^l. (JIarke to his geiuis Sputkiocuris. 



Roemer's specimen was found in the Cioniatite-limesttme of the 

 Kelwa-s.serthal, in the Hartz. 



3. Viscmocaris luta (H. Woodward), 1882. CarcZM)c«m Za/tf, II. Wood- 

 ward, ' Geol. Mag.,' Dee. 2, vol. ix. p. :\^'f^, pi. 0, fig. 1:5. Similnoraris 

 lata, Clarke,' Neu(!S Jahrb. fiir ^Min.' &e., 188-1', vol. i. p. IHl, pi. 4, fig. 2. 



Shield broadly obovate, nearly circular, v.'ith broad and deep cephalic 

 notch ; not indented behind. If complete, it would be about 22 mm. 

 long, 18 mra. wide. Slope of notch-sides about 45 '. As far as the 

 fig. 13 shows, this may be a Discinocan's. 



From Biidesheim, in the Upper Devonian of the Eifel. 



In Mr. Clarke's paper this appears as having a round shield, slightly 

 broader anteriorly than behind; with a wide notch reaching to the centre. 

 Length (complete) about 19 mm. accoiding to the figure, width 19 mm. 

 Slope of notch nncertain, probably about 50°. 



Not rare in the Upper Devonian, at Bicken, near Herborn, in Nassau. 



4. Dhciiwniris^ tn'asi'ca (Ueuss), 18G7. A^iiiiJorarlx iriusicit, llenss, 

 ' Sitzungsb. k. Akad. Wissen.sch. Wien,' math.-nat. CI., vol. Iv. 18G7, 

 j)p. 1 cf'scrj. pi. O, f. 1-5. 



As Dr. Woodward ims alroad}^ intimated ('Geol. Mag.,' D(^c. 2, vol. ix. 

 p. 38G), there is apparently no real dillerence between the late Dr. A. E. 

 von Renss's genus hero mentioned, and Discinordrii-', to which Reuss 

 thought it to be closely allied. Reuss's specimens indicate, however, a 

 different species. It was oval in outline, when perfect, and had a wide 

 and deep notch, with its apex near the centre of the test. The dimen- 

 sions of the fossils are somewhat increased by forcible depres.sion of their 

 original somewhat conical form : fig. 2, length about 36 mm., width 

 about 29 mm. ; tig. 3, length about 25 mm., width about 19 mm. The 

 slope of the nuchal suture is 40^ in the fossils, but Dr. Reuss was pro- 

 bably right in restoring it at 50° (fig. 4). 



From the Raibl beds, near Hallstadt. 



6. Discinocitris sp. nov. 



In the Cambi'idge Museum we notice a PhyllopoGous test, broadly 

 sagittate, or sharp-shovel-shaoed, in its present state, the cephalic portion 

 being absent. Originally «bovate, with a narrow pointed posterior 

 margin, it lias been truncat»!d in front by a nuchal suture of slight 

 angularity, which has left a broad shallow re-entrant angle, wit'^ -fs apex 

 reaching back about one-third of the shield's original lengtl ' its 



sides reachir 'ic margin almost before they run into the curvi. the 



