420 Revieivs — Dr. F. A. Bather — Cystideans from Girvan. 



of the Table of Girvan Strata drawn up by Messrs. Peach, Home, and 

 Macconochie (1901).' 



Llandovery — Newlands Series. 



Bargany Pond Burn. 

 Glyptocystidean (?). 



Plate of a 



Woodland Point. One plate and one 

 base (?) of a Cystid (?). 



-Ardmillan Series. 



Thraive Glen. Species of Dendro- 

 cystis, CotJiu7iwcystis, Cheirocrinus, 

 Pleurocystis. 



Shalloek Mill. Plates suggestive of 

 Echinoencrinus. 



3. Camregan Group. 

 Grits, limestones, and shales. 

 Rastrites niaximiis. 



2. Saugh Hill Group. 

 Flagstones and shales. 

 Monograptus spinigerus. 

 Bastrites peregrimis. 



1. MuLLOCH Hill Group. 

 Sandstones and shales ; con- 

 glomerate. 



Diplograptus acimiinatus. 



Caradocian- 



5. Drummuck Group. 

 Mudstones, Starfish Bed. 

 Dicellograptus anceps. 



4. Barren Flagstone Group. 

 Diplograptus tnmcatus. 



3. Whitehouse Group. 

 Dicellograptus complanatus. 

 Pleurograptus linearis. 



2. Ardwell Group. 

 Flagstones and shales. 

 Climacograptus caudatus. 



1. Balclatchie Group. Ardmillan ; a Glyptocystid (? Cheiro- 



Conglomerate, mudstones. crimes) and plates a and 0. Bal- 



Climacograplushicornis. clatchie ; plates j3 (7 = Glyptocys- 



tidean) and 6 ( = Echinosph8erid). 

 Dow Hill ; plates 5 and e, plates of 

 Cheirocr. (?), and fragments indett. 



The Starfish Bed, as its name implies, is prolific in Echiiioderms. 

 In addition to Tetraster Wyville-Thomsoni there are many Asteroidea, 

 now being studied by Mr. W. K. Spencer. Though the Cystidea of 

 the Starfish Bed are numerous in individuals, the number of species 

 is small. Dr. Bather describes only nine species, of which eight are 

 new, and it is, he thinks, quite possible tliat some future palaeontologist 

 will say these are twice as many as they ought to be. The genera 

 represented are — 



Ehombifera — 



Super-fam. Glyptocystidse. 

 Fam. Cheirocrinidae. 



Cheirocrinus. 2 spp. 

 Pleurocystis. 4 spp. 



Amphoridea Heterostelea — 

 Fam. Dendrocystidse. 



Dendrocystis. 1 sp. 

 Fam. Cotburiiocystidse. 



Coth'urnocystis, n.g. 2 spp. 



The Amphoridea among the extinct Cystidea are defined by the 

 author (p. 364) as " Primitive Cystidea in which radial symmetry 

 has affected neither food-grooves, nor thecal plates, nor (probably) 

 nerves, ambulacral vessels, nor gonads ". In fact, they are most 

 irregular forms of Echiuoderma, and might well be styled as the 

 ' Nonconformists ' of their order, of which Rhipidocystis is an example 



^ " The Silurian Eocks in the South of Scotland " in Fauna, Flora, and 

 Geology of the Clyde Area, Brit. Assoc. Glasgow, pp. 423-44. 



