ON THE FOSSIL rilYLLOPODA OF THE TAL.EOZOIC ROCKS. 93 



' Quart. Jour. Geo!. Soc' vol. xix. 1863, p. 88, f. 1 (woodcut) gives a cir- 

 cular form ; but at p. 90, f. 4 (woodcut) gives an oval outline. 



In I860 (' Quart, Jour. Geol. Soc' vol. xxii. p. 504, pi. 25, f. 6) Dr. 

 H. Woodward gave a careful figure of this species from a good specimen 

 (measuring 12^ mm. in length and 10 mm. in -width l ), giving it its true 

 oval outline, rather blunt at tbe ends, the rostral piece making a distinct 

 curve of its own at the front (Moffat). A distorted specimen is figured 

 in the 'Proc. Belfast Nat. l< y ield Club,' 1877, Appendix, pi. 7, f. 24a, by 

 Messrs. Lapworth & Swanston, from Tieveshilly, nenr Portaferry, Co. 

 Down, Ireland. This is from either the top of the Middle Silurian or the 

 base of the Upper Sihman (op. cit. p. 122). H. Woodward's figure is 

 reprodnced in illustration here, fig. 24& ; and again by Mr. J. Dairon, 

 'Trans. Geol. Soc. Glasgow,' 1883, pi. 7, f. 29, for a Moffat specimen. 



Some specimens in the Museum of the Geological Survey are oval. 

 One (D^), almost perfect, is a pyritous film, with the rostral piece in 

 place, and with obscure concentric lines ; from the Llandeilo formation ; 

 locality unknown. Specimen D-/ T is a black film; the shield has been 

 oval, but one half is modified by pressure. Upper Llandeilo ; Duff- Kennel, 

 Dumfries. 



In the Museum at Jermyn Street there is also an imperfect Peltocaris 

 (D ? 4 ff , from Moffat), of relatively large size, length ?, width 24 mm., very 

 delicately and regularly concentric in its linear ornament ; and it seems 

 to show what Mr. Salter intimated at p. 88, ' Quart. Jour. Geol. Soc' vol. xix. 

 — namely, that the umbones, or angles at the front end of the median 

 sutures, may come away by the weakness of a small curved sutural line 

 bounding them and concentric with the strias. See also Mr. Salter's 

 drawing of the notch in 'Quart. Jour. Geol. Soc' vol. viii. pi. 21, f. 10. 



In the British Museum, a specimen (from the Grieston beds, Gala 

 Group, Rotten Gair, Inverleithen), slightly modified by pressure, was 

 probably almost oval in outline, 15 by 14 mm. Another, also broadly 

 oval when perfect, length about 19 mm , width 1G mm., has somewhat 

 sinuous sides to the notch, that is, it widens in the middle and then con- 

 tracts, forming a small notch at its apex. Something like this, but not 

 quite the same, is seen in .the figures of the natural size and enlarged at 

 p. 88, 'Quart. Jour. Geol. Soc' vol. xix.; it more closely resembles 

 fig. 10, pi. 21, 'Quart. Jour. Geol. Soc' vol. viii. 



2. Peltocaris anatina, Salter, 1873. 



In the ' Catal. Palasoz. Fossils Cambridge,' 1873, at p. 93, Mr. Salter 

 mentions this species, but it is not figured. The diagram annexed to it, 

 and given in illustration of the generic type, is P. aptychoides. That a 

 Peltocaris was intended here is evident from the words, ' its semi-oval 

 rostrum is seldom found-; ' but the specimen (from Rebecca Hill) labelled 

 with this name, in the Cambridge Museum is an Aptijchopsis (with angular 

 notch). Mr. Salter's intended species cannot therefore be recognised at 

 present. 



In this Museum there is an oval Phyllopod shield, with a semi-oval 

 notch, but it has been somewhat narrowed by lateral pressure, and the 

 notch may have been modified by the same cause. The suture, however, 

 cannot be made out : if it be absent, the specimen belongs to another 



1 The statement that the figure is magnified three times seems to be a mistake in 

 the explanation of the plate. 



