234 



Till CAIfAPIAN NATrRAI.IST. 



[Vol. Vii. 



. /- 



%^J 



?e 



** 6. Z. IlKcrBA. — Corallum liir'^e. oxpau'lini: to a diaim'tf^r of 

 Ih iiiohcH in ii leni^th of \ iiiclie?". Surface with iininorous, 

 |jli^;litly eltnatcd, rinjrs of irrowtli. (V)st!il stria? at the tnarnlTi 

 of tlie calico jihout 1 line wide ; 5 or (5 in a width of !} lincH at 

 the base. Wliere tht^ di.tnutcr is 2.-^ lim s. th<?rc «re 50 lar^e 

 tepta, many of whicli reach the centre, lietwecn these there are 

 50 snialhT siijita of about ] line in depth. The calicc in a speci- 

 men 5^ inchc« in lentrtli, measured alonj; the convex curve, is 20 

 lines deep. The w:ill is very thin, all llie septa re.ichintr the 

 margin, on aiiproachin^ which, they all l)ecoine of nearly the 

 same size, and reduced to t!iin elevated rid^res, le<«s than a line 

 in helLriith, with concave trrooves between them. The bottom 

 of the cuj) occupies about half the whole width, nearly flat, the 

 Bi'pta forming small elevated lines ui'on its surface, converuini; to 

 the centre. The fos,st'tte is lurye and h is three .septa in it ; (»no 

 large and two .small. This tpeeies r<.'< Mnb!e» the l-.isi, bu! differs 

 therefrom in beiu'j,' a larger l(>rm, with the rudimentary -lepta 

 less <levelopcd. There is ai'^ ' a stroi);^ likeiiess between it and 



Zi. Sli>/:rsi. Ci>i ulferoiis. 



• .. ,. •,. ',(1 



.. -r* 7. Z. IvJKKlA. — Corallum, ofien stnmirly curved for 2 or 3 



■inehesat the base, beeominu' more nearly itraijiht above: expand 



in;r to a wi<ltli (tf fiom IS to li'i lines in a le;iui-ii of 4 or 5 inches. 



Surface v'lth nuuieneis rings, .nid a few undulations of LMowth. 



K]/itheea thin, with .- or 1<» costal stri;B in a width of '.i lines 



near the buse; about !>alf tliat number in the sumt! .space in the 



upper p.irt of tli > coral. 



In one specimen, in a transver.^e polished .section, 3 inches 

 from the base; there are (it largo s'pta i! or '--ur lines in depth, 

 and the s.inie number of .small ones between 1 and 2 lines in 

 depth. The diameter of the coral is here 18 lines. 



In another individual, there is the same number of septa as in 

 the former, the larger 5 or G lines in depth and the smaller from 

 2 to 4 lines. The diameter of this section is 25 lines and was 

 cut across the coral at 4^ inches from the base. 



A siliei(ie<l s|)ecimen. () inches in length, shows that the cuj) is 

 over an inch in depih, and tlu' tabuhn excessively thin and fra- 

 "ile. 



'IMiis is a ni(U"e slender species th.in Z. Hcculm. It differs 

 further in having more nutnerous .septa at the same diameter and 

 the large ones not reieiiing the centre except apparently near the 

 ibase. It occurs in the Corniferous. 



