78 BRITISH PALEOZOIC PHYLLOCARIDA. 



abdomen retains some trace of caudal spines, but has probably been turned upside 

 down. 



In bluish-grey shaly flagstones with rusty facings. From the Lingula-flags 

 at Borth, Portmadoc. Cambridge Museum (ytt tV)- 



3. A distorted and somewhat crushed, but otherwise nearly perfect individual 

 (PI. XIII, fig. 2). The abdominal segments (eight well shown with a trace of 

 another) are turned up behind at a sharp angle with the carapace ; and the last 

 segment retains some portions of the caudal appendages. 



In bluish-grey flagstone with rusty facings. Middle Lingula-flags ; Borth, 

 Portmadoc. British Museum, I 322. D, H. 



4. The broken front part of a valve, with eight segments (and trace of a ninth) 

 lying at an angle with it, and retaining portions of the tail-spines. PL XIII, fig. 3. 



In bluish-grey slaty flagstone with rusty facings. Portmadoc. British Museum, 

 I 322. D. H. 



5. Carapace or left-hand valve, lying separate from seven body-segments, 

 not perfect, but retaining a remnant of one of the caudal spines. PI. XIII, fig. 4. 



In dark grey slaty mudstone, minutely micaceous. Middle Lingula-flags ; 

 Borth, Portmadoc. In the Cambridge Museum (j^r ale)- 



Referred to in the ' Report Brit. Assoc' for 1888 (1889), p. 178, fig. 3. 



6. A small specimen (PL XIII, fig. 6), showing the right-hand side of a cara- 

 pace having a bold posterior ogee curve that has been increased by pressure. Also 

 eight body-segments, turned downwards at right angles, and retaining the full 

 number of cercopods, namely, a small central pair, flanked on each side by one 

 large and one small spine. Of these appendages the middle pair are rather 

 shorter than those in fig. 9 (magnified 2^ diameters), but the outer pairs are of 

 about the same length. 



In dark-grey slaty mudstone. Middle Lingula-flags ; Borth. Cambridge 

 Museum d^ ^. D. H.). 



Referred to in ' Report Brit. Assoc' for 1888 (1889), p. 178, fig. 5. 



7. A large carapace, or left-hand valve (PL XIII, fig. 13), modified by pressure, 

 and widened into an irregular lozenge shape. 



In dark-grey schistose mudstone. Lingula-flags ; Portmadoc. Museum 

 Practical Geology, marked ^ ; Wyatt-Bdgell Coll. ' Catal. Camb. Sil. Foss.,' 

 1878, p. 10. 



8. Distorted valve, narrowed by pressure, and imperfect by fracture at the 

 lower part of the posterior edge. PL XIII, fig. 6. In contrast with fig. 13. 

 Referred to in the ' Report British Assoc' for 1888 (1889), p. 178, fig. 2. 



In dark-grey slaty flagstone, very minutely micaceous, much squeezed. From 

 the Ffestiniog gi-oup ; Borth, Portmadoc. 

 Cambridge Museum (rra). 



