166 G. P. MATTHEW : ILLUSTEATIONS, ETC. 



Fig. 2. — Ptychoparia Linnarssoni, narrow form. — a, Middle of the head-shield, 8J x 11 mm. Mag. t- — b, Movable 

 cheek, 2i x 9 mm. Mag. h — c, Pygidium, Si x 6^ mm. Mag. t. — d, Larval stage, middle-piece of the head- 

 shield, 2 X 2J mm. Mag. t. — e, Later larval stage, with glabella somewhat conical, 3J x 4 mui. Mag. |. — 

 /, Later stage with longer spine and projecting posterior angles, 7J x 9 mm, Mag. Î. All from Div. Id, 

 St. Martin's. See p. 1 47. 



Fig. 3. — Soknopleura HohUi, Hartt. — a, Head and twelve segments of the thorax, 22 x 18 mm. Natural size. — 

 b, Pygidium, 2 x 6i mm. Natural size. — c, Centre-piece of the head-shield, 11 x 15 mm. Natural size. — 

 d, Same in profile. — e, Same seen in front.—/, Pygidium, enlarged to show rings and costae, 2i x 6i mm. 

 Mag. ^. — g-l, Embryonic and larval series. — g, Second embryonic stage. Glabella continuous and pygidium 

 defined. Mag. '°. — /i, Third embryonic stage. Head-sliield only. Glabella continuous, ocular fillet and 

 posterior fold defined, i x IJ mm. Mag. ^i''.— t, Fourth stage. Long glabella and eyelobes near the front, 

 1 X li mm. Mag. -"r. — A-, Fifth stage, middle-piece of head-shield. Glabella sliorter and eyelobes some- 

 what indrawn, 1| x 2J mm. Mag. ';. — 7, Lafer stage. Glabella shorter and more conical, 2x3 mm. 

 Mag. ^ All from Div. Ic. Portland and St. Martin's. See p. 153. 



Fig. 4. — Solenopleura Robhii,vaT. Orestes (narrow form). — a, Half-grown individual enlarged ; the movable cheeks are 

 pushed backward, and the three posterior segments of the thorax pushed forward under the others, 

 12 X 9 mm. Mag. i. From Div. I.e. St. Martin's. — 6, Middle-iiiece of head-shield, 10 x 12J mm. Natural 

 size. — c. Movable cheek with blunt point, 3x9 mm. Natural size. — d, Movable cheek with short spine or 

 point, 3x9 mm. Natural size.— f, Pygidium, 2J x 7 mm. Mag. t. From Div. ic. Portland. See 

 p. 154. 



Fig. 5. — Solenopleura Acadiea,Vfhitéaves. — o, broad form, shewing the broad head and very narrow pleura, 17 x 13mm. 

 1 1 

 Mag. -— From Div. l.d. St. Martin's. — b, Narrowform. Head and thirteen segments of the thorax, 



genal points longer, 26 x 24 mm. Natural size. From Div. Id (?). Westfield. See p. 157. 



Fig. 6. — Solenopleura Acadica, var. elongata, complete test, 25 x 18 mm. Mag. f. From Div. Id (?) At Simond's. 

 See p. 159. 



Fig. 7. — Liostraeiis Onangondianus, var. Aurora. — a, Middle-piece of head-shield, 12x6 mm. Natural size. — b, Same 

 in profile. — c, Same seen in front. From Div. Ic. Portland. — d, Another head, 9 x 14 mm. Natural 

 size. — e, Same in profile. — '', Same seen in front. From Div. Ic. St. Martin's. See p. 139. 



Fig. 8. — Ellipsocepludus, sp. cfr., polytomus. — a. Part of head-shield, shewing glabella, occipital ring, and fixed cheeks 

 10 X 15 mm. Natural size. From Div. 16' (erroneously referred in the text, p. 129, to Div. Ic.) St. 

 Martin's. — b, Same in profile. — c, Same seen in front. See p. 139. 



Plate III. 



Paradoxides regina, Matthew. Natural size. One free cheek and a part of the glabella restored. The glabella is 

 somewhat distorted by the hypostome, which is a little out of place. The whole fossil is flattened in 

 the slate, somewhat compressed diagonally, and shortened by pressure. From the lower part of the 

 upper half of Band c in Div. 1. See p. 119. 



