170 PEor. p. MARTIN Duncan's eeyision op the 



of the eorallum closely resembles that of Microsolena. Gem- 

 mation occurs, on the margin of the calices or within them. 

 Distribution. — Fossil. Jurassic : Europe. 



Genus DiMOEPHAE^A, de Fromentel, Introd. PoIt/j). foss. 'p. 254i 



(1858-61). 



Syn. DimorpTioseris, Duncan. 



Colony polymorphous in a convex mass, or laminate. Calices 

 shallow, a central larger one surrounded by others placed, cir- 

 cumferentially. Septo-costse continuous from the central calice 

 to the others and between them. Septo-costse numerous, and 

 close or few. Free edge of the septa minutely punctate, and 

 the rest of the structure as in Microsolena. An epitheca. 



Distribution. — Fossil. Jurassic : England, Europe. 



Genus Latimjeandeae^a, de Fromentel, 1856, Introd. Polyp, 

 foss. p. 247 (1858-61). 



Syn. Meandrarcea, Etallon. 



Colony in a lobed and subplane form (laminate). Calices not 

 very deep, distinct, and situated between rather high coUines with 

 rounded tops. Septa trabecular, spin ulose, and confluent. Wall 

 absent. Columella rudimentary. - A thin but well-developed 

 epitheca. 



Distribution. — Fossil. Corallien of England, Europe. 



The founder of this genus states that the septa resemble those 

 oi Microsolena, Lamouroux, and Disarcea, de Eromentel. 



It appears that in some species the valleys are long, twisted at 

 the centre, and straight at the circumference of the colony. The 

 septo-costse pass over the coUines except in one instance, L. Cot- 

 teaui, E. de Erom., which is exceptional. 



Genus Meandeoseeis (pars), L. Bousseau in (?' JJrviUe's Voy. 

 au Pole Bud, t. v. p. 121, amended. 

 The colony is partly adherent and rather thick, has a basal 

 imperforate costulate wall, which is naked and more or less sub- 

 lobed. The calices are shallow, distinct, and are grouped in 

 long or short linear series, which are separated by low coUines 

 or eminences. Septa extend from one calice to another and 

 over the eminences, are dentate, trabecular, and perforate ; perfo- 

 ration less low down. Columella small and papillary. Emi- 

 nences low, long or short, and more or less radiating from the 



