166 William Hellier Baily 



The following list of fossils from these places is derived from 

 the memoirs of the Geological Survey of Ireland [Explanation to 

 sheets 102 and 112., p. 11.] :— 



Lower Silurian : fossils ; Portrane, and Lambay, 

 County Dublin. 



Hydrozoa : Graptolites. 

 Diplograpsus pristis. 



Actinozoa : Corals. 

 Cyathophyllum ; species not determined. 

 *Favosites cristatus. 

 „ asper. 



* „ fibrosus. 

 ***Halysites catenularius. 



**Heliolites interstinctus, and variety megastoma. 

 *Syringophyllum organum. 



Mollusca ; Polyzoa. 

 *Ptilodictya dichotoma. 



* „ acuta, 



Braehiopoda. 

 Atrypa marginalis. 

 Discina ; species undetermined. 

 Lepteena quinquecostata. 



,, sericea. 



„ tenuicincta. 

 Lingula ; species undetermined. 

 Orthis biforata. 

 ** „ calligramma. 

 ** „ elegantula. 

 ** „ insularis. 



,, porcata. 

 ** „ testudinaria. 



,, vespertilio. 

 ***Strophomena alternata. 



* „ rhomboidalis. 



* „ expansa? 



Conchifera. 

 Ctenodonta ; species undetermined. 

 Modiolopsis ; do. do. 



. Gasteropoda. 

 w Cyclonema crebristria ? 



„ rupestris 1 



Euomphalus, two species ; one new, the other undetermined. 

 *Holopea concinna. 



Murcliisonia ; two species undetermined 

 Raphistoma ; new species. 



