Fossils from Muldcj Gotland. 149 



The British specimens were from Woolhopcand the shales 

 of the Lower ami Upper Weiilock series. 

 Silurian; Mulde, Gotlajid. Very rare. 



Pn'initia ornata^ Jones & IIoll. 



Primitin ormitn, Jones &: IIoll, 1880, Auu. & Mag. Nat. Ilist. ser. 5, 

 vol. xvii. p. 411, pi. xiv. li;j. o. 



This species was described from the Upper Wenlock and 

 Woolhope serie.''. It is a small but striking form, on account 

 of the beautifullv reticulated surface. 



Silurian ; Mulde, Gotland. Common. 



Primitia reticristatUf Jones. 



Primitia reticristata, Jones, 1887, Silur. Ostrac. Gothland, p. 6 ; id. 

 1888, Ann. & Mag. Nat. Hut. ser. 6, vol. i. p. 400, pi. xxii. 

 figs. 15 a-c. 



A common form in the Gotland series and already recorded 

 from Frojel, 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. liist. ser. 2, vol. xvi. 



p. 90, pi. v. tig. 2;3. 

 Prhni'tia mundula, Jones &; HoU, 18G5, Ann. & Mag. Nat. Hist. ear. 3, 



vol. xvi. p. 410; Jones, Krause, 1891, Zeitsclir. deutscli. geol. 



Gesellsch. vol. xliii. p. 495, pi. xxx. figs. 6 a-c, G, 7 a, b. 



This well-known Silurian species is represented in our 

 collection by a fine series of well-preserved specimens. 

 Silurian ; Mulde, Gotland. Common. 



Subfamily /iETitrcjsiiy^, nov. 



Klgedenia, Jjues & Holl [1886J. 



Kloedenia opiculata, Jones. 



Kladenia apicithita, Jones, 1888, Ann. & Mag. Nat. Hist. ser. 6, vol. i, 

 p. 398, pi. xxi. figs. 1-5. 



A few typical specimens occur in our washings. The 

 original types came from Slite, in Gotland. 

 Silurian ; Mulde, Gotland. 



Klcedenia gotlandica, sp. n. (PI, III. figs. \2a, b.) 



Valve seen from the side suboval, elongate; ventral margin 

 pUiptically convex ; dorsal margin straight, but intruded o\\ 



