Fossils from Mulde, Gotland. 149 
The British specimens were from Woolhope and the shales 
of the Lower and Upper Wenlock series. 
Silurian ; Mulde, Gotland. Very rare. 
Primitia ornata, Jones & Holl. 
Primitia ornata, Jones & Holl, 1886, Ann. & Mag. Nat. Hist. ser. 6, 
vol. xvii. p. 411, pl. xiv. fig. 5. 
This species was described from the Upper Wenlock and 
Woolhope series. It is a small but striking form, on account 
of the beautifully reticulated surface. 
Silurian; Mulde, Gotland. Common. 
Primitia reticristata, Jones. 
Primitia reticristata, Jones, 1887, Silur. Ostrac. Gothland, p. 5; id. 
1888, Ann. & Mag. Nat. Hist. ser. 6, vol. i. p. 406, pl. xxii. 
figs. 15 a—c. 
A common form in the Gotland series and already recorded 
from Fréjel, in Gotland; also from the Silurian Drift of 
Mark Brandenburg. 
Silurian; Mulde, Gotland. Very common. 
Primitia mundula, Jones. 
Beyrichia mundula, Jones, 1855, Ann. & Mag. Nat. Hist. ser. 2, vol. xvi. 
p- 90, pl. v. fig. 28. 
Primitia mundula, Jones & Holl, 1865, Ann. & Mag. Nat. Hist. ser. 3, 
vol. xvi. p. 419; Jones, Krause, 1891, Zeitschr. deutsch. geol. 
Gesellsch. vol. xliii. p. 495, pl. xxx. figs. 5 a-c, 6, 7 a, 6. 
This well-known Silurian species is represented in our 
collection by a fine series of well-preserved specimens, 
Silurian ; Mulde, Gotland. Common. 
Subfamily Dzerriearms, nov. 
Ki@peniA, Jones & Holl [1886]. 
Kledenia apiculata, Jones. 
Kledenia apiculata, Jones, 1888, Ann. & Mag. Nat. Hist. ser. 6, vol. i. 
p. 398, pl. xxi. figs. 1-5. 
A few typical specimens occur in our washings. The 
original types came trom Slite, in Gotland, 
Silurian ; Mulde, Gotland. 
Kledenia gotlandica, sp.n. (PI. III. figs. 12 a, b.) 
Valve seen from the side suboval, elongate ; ventral margin 
elliptically convex ; dorsal margin straight, but intruded on 
