TERTIARY LIMESTONE NEAR SAG AR A, TÖTOMI. 239 



called by Areschong-, or " Markstrang-" of Solms-Laubncb, tbe cells 

 are divided and multiplied principally by nie:!ns of dicbotomy, 

 or " snbdicbotomy ", according- to ]>ornet, and sometimes tricbo- 

 tomy or " subtricbotomy "; Avbile in tbe " [»eritlmlliiim," so-called 

 bv lu)tbpletz, tbe cell-increase t'dces ])lace mostl\' by tbe process of 

 transverse fission or ** Qnertbeilung'." 



Tn tbe slides prepared, ti-ares of tbe pores sng"g'estive of wbat 

 are known as " tetraspores "' are .s()metime.s seen in tlie ])eri- 

 tb:dlinin ; no remains of cvstocarps bave been recog'nised. 



Tbe approximate dimensions of tbe ])eritbaHic-cells are 

 12-20 n in lengtb and 12-10 n in breadrb, wbile tbe by- 

 potballic-cells are of still larger .size, being n(^t unfreqnently 

 25 p. broad and 37-50 p. long-. Tbe former dimensions ap- 

 proacb nuicb more closel}' to tinsse of L. nnno^issiimiui Eeuss tban 

 to tbose of anv described bv otber autbors. lielyiiig npon tbis fact 

 onlv, and putting- aside anv point as to f )rm, as Giimbel sugg-ested, it 

 will not be far from tbe trutb to class our species witb L. rainosissiinuni, 



Stylophora sp. 



PI. XXIX. Fig. 6. 



Coral remains are also abundant, Ijut all of tbem found as casts 

 and conse([uentIv indeterniinabje. One of tbem, bowever, mav belong- 

 to tbe section of ^Lidreporaria, and ])erba[)s to tlie genns Sfiilophora, 

 in so fir as it sliows traces of tbe fully develo|''ed six septa, etc. 



Millepora sp. 



Pb XXIX. Fig. 7. 



Besides tbe abov^e cond remains, tbere occurs anotber coral-like 

 form wbich may be regarded as belonging t(j Millcpora of tbe 



