DESCKIPTIONS OF SPECIES. 193 



The smallest calice, whose measurements have just been given, is situated on 

 the side branch. It seems to me that the other specimens that I have seen 

 are pieces of young branches or come from near the tips of branches; and 

 therefore the specimens and their cahces are small. 



The character of the costs, number and arrangement ot septa, an.l 

 character of the columella are the same in all specimens. It should be 

 borne in mind that in the larger specimens the costae are necessardy coarser. 

 All the specimens of the species come fro.n beds of Lower Claiborne age. 

 Family MADREPORID^ Milne-Edwards and Haime. 

 Genus DENDKACIS M.-Edw. aud H. 

 Dbndracis tubulata (Lonsdale). 

 PI. XXII, tigs. 23 and 24 (reproduced from Lonsdale). 

 1845. Ma^repora Ucbulata (?) Lonsdale. Quart. Jour. Geol. Soc. Lond., Vol. I, p. 520, 



1860. DeJlfac^Mata Milne-Edwards aud Haime. Hist. Xat. des Corall., Vol. Ill, 

 p. 170. 

 The following is Lonsdale's original description: 



Branched- branches irregularly divergent, cylindrical, slender, composed chiefly 



P , Tntuiferous tubes springing from the center and diverging slightly; interme- 



':^%^^^^^^^^ 'onrinuous central tube; lamcll. twelve si. very nar^ 



J^ranclltited in vertical range; surface terminations of tubes small; irregularly 



''^^^e^lSHf Srj^; tubulau, ( .) consisted wholly of casts of th« ex^ior 

 n„d Of the lamella- tubes. The diameter of the branches in no case exceeded three 

 lil or ?ha Itt unmagnitied ligure (a). The tubes sprang successively from the 

 axiT'and wholly composed it, the perfect exclusion of a central, continuous tube or 



t.r AS thev oradually diverge, they separated, slightly increasing in diameter 

 am 'i-et the surface trminatioo 'they suddenly bent outward, their relatively grea 

 ' IrSines'Ind small width producing the scattered distribution of the termxna 



r,fs In Stt ird's figures the branches have a greater diameter and the casts of 

 S UrsafecC^The lamelhe through a considerable portion of the tubes were 

 the stais are ciosei. ,„.o.v,ler the casts of the six narrow commencing about 



plates, ami ^ot structure. The nature of the interspaces between the 



iurerwrvery Crf tly exhlbft^ remains being limited to a few filiform 



MON XXXIX 13 



