SuB-CLASS—CIRRIPEDIA. ORDER—THORACICA. 
Family—Batania. 
Cirripedia sine pedunculo; scuta et terga musculis depressoribus instructa; relique 
teste valve inter se immobiliter conjuncte. 
Cirripedia without a peduncle; scuta and terga furnished with depressor muscles ; 
other valves united immoveably together. 
This family, which includes all true Sessile Cirripedes, may be divided into two very 
natural sub-families ; namely, the Balaninee and Chthamaline ; but as not one member of 
the latter has been found fossil in Great Britain, and indeed only one, the Pachylasma 
yiganteum, in any part of the world, viz., in the recent beds of Sicily, this sub-family of 
the Chthamalinee may be here passed over in silence. 
Sub-Family— Batanin am. 
Rostrum cum radiis, sed sine alis: valve teste laterales omnes, ex uno latere alis, ex 
altero radits instructe : parietes feré aut porost, aut ad interiorem superficiem longitudi- 
naliter costatt. 
Shell with the rostrum having radu, but without ale; lateral compartments all having 
alz on one side and radii on the other side; parietes generally either porose, or longi- 
tudinally ribbed on their inner surfaces. 
Genus—Batanvus, Auct. 
Conopea (pars generis). Say. Journal Nat. Sc. Philadelphia, vol. ii, Part 2, 1822. 
Messuza (do.) Leach. Zoological Journal, vol. ii, 1825. 
Currona (do.) J. #. Gray. Philosoph. Transacts., 1835, p. 37. 
Valve operculares inter se articulate, subtriangulares ; valve teste 6 ; basis calcarea aut 
membranaced. 
‘Cae 
