128 Lap worth— Graptolites of Co. Donw. 



4. Sp. 2. Monograptus spiralis. Geinitz. (Leon & Bronn, Jahrbuch, fiir. 



Min. 1842. PI. 10.) PI. 5, fig. 12. 



This species is usually identified with Prionotus convolutus of Hisinger, but 

 according to Dr. Linnarsson ( 1.) the latter was originally founded upon a specimen 

 of Rastrites peregrinus (Barr. ). Locality — Tieveshilly. 



5. Var. f a), fimbriatus. Nich. PI. 5, fig 17. Locality— Coalpit Bay. 



6. Var. (b). communis. Lapw. PL 5, fig. 16. 



The two preceding forms are certainly most intimately allied. The latter 

 has an extended range, and varies much in the forms of the polypary and hy- 

 drothecae, and seems to pass into the following form, M. fimbriatus, on the 

 other hand, is very local in its distribution, and constant in its general features. 

 Locality — Coalpit Bay. 



7. Var (c). proteus (?). Barr. PI. 5, fig. 18. 



It is doubtful if this form is actually identical with Barrande's species. His 

 figures remind one rather of M. crispus (Lapw.); and the group typified by 

 M. lobiferus (M 'Coy). Locality— Coalpit Bay. 



8. Sp. 3. Monograptus Sedgwicki. Portl. PI. 5, fig. 15. Locality — Coalpit 



Bay. 



9. Sp. 4. Monograptus turriculatus. Barr. PI. 5, fig. II. 



As in South Scotland, the majority of the specimens of this species in the 

 beds of County Down are of very diminutive size . Locality — Tieveshilly . 



10. Sp. 5. Monograptus crispus. Lapw. PI. 5, fig. 13. Locality — Tieveshilly. 



11. Sp. 6. Monograptus exiguus. Nich. PI. 5, fig 9. Locality — Tieveshilly. 



12. Sp. 7. Monograptus Barrandei. Suess. PI. 5, fig. 21. Locality- 



Tie veshilly. 



13. Sp. 8. Monograptus runcinatus. Lapw. PI. 5, fig. *]. Locality — 



Tieveshilly. 



(1.) Linnarsson. Afdreg ur Geologiska Foreningens i Stockholm Forhandlingar, 1877. No 

 40. Band III. No. 12. 



