23 



nearly to the centre of the coral, apparently forty-eiirht in number. Epithcca thin, with a 

 few shallow undulations of growth, but apparently destitute of costie. 



Tin- species is. closely allied to the preceding, but appears to be clearly distinct, though 

 the above description is founded upon but a single specimen. It differs from 7. - 

 giijii,,!:'! chiefly in the greater proportionate thickne-- and much smaller nurnberof the septa, 

 and tli : remoteness of the tabula.-. The former of these, characters, as well a.- the tact 



that the septa are equally develoj.nl. .-.], -irates it from Z. /'/. '//'//<>/. 



The tabulae of the oironmferenoe of the coral, where they Lend downwards to m 

 epith' !. -eem to be clearly of the nature ..f dissepiment-, a- they arc not placed at exactly 

 the same level in contiguous interseptal loculi. The -p.-cific ivime i- intend. ! to i-"mmemo- 

 rate the peculiar fenestrated appearance exhibited by portions of the coral from which the 

 epitheca ha- been removed, when the mterseptal loouli are seen to be crossed at intervals of from 

 two to three lines, liy the obliquely <\ sc "nlini:- tabula;, producing a series of oblong ' lee, 



Lenirth of the only specimen observe.!, live inche- ; diameter ot' -umuiit. one and a half 

 inches : caliee and fos.-ette, unknown. 



L alitya-nd Formation. L'oruiferous Limestone, Port Colbor 



13. .ZAPHRENTIS PROLII ITA (Billing-). 

 (Plate III., Figs, i', 2a.) 



Zaphrentis prolifica (Hillings', Canadian ./ , <//, New Series, Vol. iv., p. li'l. ;' 

 23. 



" Corallum simple, turbinate, curved, with a few broad, shallow, encircling Folds. S-p 

 tal fn-sette of a pyriform shape, gradually enlarging from the margin towards, but not quite 

 reaching, the centre ; variable in its position in relation to the curvature of the fossil Radiat- 

 in. - !a in the adult specine n- between sixty and seventy of the larj-T si/e. alternating' witli 

 a lik- ir.im!" r ..('. -mailer ones ; the former, in -ome of the individuals, extending t<- 

 on the bottom of the cup, where they are -pi rally twi-'ted or irregularly contorted ; in . 

 specimens imt reaching the centre, which i- then occupied by a smooth space, or often witli 

 a eolumella elongated in a direction from I -tie toward* the opposite -ide. T 



gepta ar sharp-edged for almo-t half the di-t-me" from the h"ttom of the cup I" the 



margin, then b-eume gradually less projecting, until at tlie edire ot the cup thev are ivdc. 

 to He re 11 't puinded rid^c-. Le n -th, IV" m f"iir to five inches, or a little' more ; width of cup, 

 fri-m two i-ji'liea to two inelie- and a-half ; deptli of cup, about one inch." 



' V'-ry num'-rous -peeimen.- .,fy,,uiig individuals of thi> -pe.-ie>. one inch and a half anil 

 upward- in l-njth. and with fifiy or more principal radiating sept i, occur with th 



,n. T! r;li ones n:i_ l ' p"rhap- I led as constituting a distinol but 



when go 1 -peeimen- fm be observed . ten 



the hr_c individuals " ( IJillin.. 



\Vliil-t bavin- I he imp.re--i"ii that the gj niple- ju-t alluded to are S] Iv di- 



tinct from the larger ono with which thev a:-i' united bv Mr. Billings, I mu-t fivciv admit 

 thai tions ar> not -iilliciently e.\ for me to pronounce a decided i ini"ii in 



tlie ' peoimens, indeed, having the char- ,-crihed i,y Nlr r. 



r from c"miiiiiii, and I ha\e imt 00 than four or five ; whilst 



.-mali. I' am] lefl U abundant. 



'I'hel,' m pies are di hed from /; a, by their smaller dimenaTons, tt 



turbiiritc fiiriii, tin; .-bape of the fo--ule, and the much great* i numlier of the ,-ep i : :. . 



'i' d cdje- \\ln-retlicy approach the margin of the oup. 



Tip- smaller examples, a- a rule, exhibit character- by which they can be reidilv di-!: 

 ed. They arc m" t OOmmonlv alioiit an inch and a half in leii-th but varv iV.'in th: 



<|U.il!' r- Of M Midi Up to thlee inches. The cilice I ieep. hill i- e\tre|||el_\ "bl|,|Ue 



ie-t hei-ht beiirj on the -ide of the cuir.cx onrvEtan of the coral. Tie 



int. . .n. I -mall, and tin- primary ,-epta are alw.iv- mor 1. -- bent a;id OODtOl 



tlie\ ippr....-h the cc-ntrc. 'I'll.- tabuLe are bent downward- "ii appro:i.-hi- all. 



-pitl.'-i m p. ri'i-ct specimens exhibits a few broad and rounded nndolationi ' -wtb, \\iili 



M. 1\ marked eoflta corresponding with the septa within. M pec mmonl) the ej.ith- 

 IB denuded, beii rj thin, when the pta appear* mspiou u-.s ..n the .-uri i.-. 



tin- ooral. 



