12 MnXOrHORA. 



The specimens collected al Juan Fernandez are all small, and are referred 

 with some doubt to this Bpeciea. 



Joan Fernandez ; Cape !>"- Bahiaa (East Coast of Patagonia). 



ENCOPE. (Moxopiiora.) 



Monophora A.QA88., 1847, in 1>i 8., Boll. Soc. Geol. Fr.. IV. 287. 



A number of admirably preserved specimens of this genus have enabled 

 me to figure this interesting species, and to give some important details re- 

 garding its affinities, and the correlation of certain characters among Scutel- 

 lidae, which will be of considerable systematic value. 



The marginal limestone network connecting the actinal and ahactinal 

 floors extends about half-way from the edge to the actinostome ( PI. 111. 

 f. .;); it resembles the marginal supports of Encope, showing no radiating 

 separations between the pillars, in the median ambulacra! and interambu- 

 lacral spaces, as in Mellita ; this feature Mellita has in common with Echina- 

 rachnius. The walls separating the cavity of the jaws from the alimentary 

 canal are low ridges, corresponding in their course to the windings of the 

 analogous broad walls of Encope. The jaws, or rather the fragments which 

 were preserved, resembled the jaws of Encope: the auricles are slender, elon- 

 gate. The marginal ambulacra] indentations are reduced to mere re-entering 

 angular side- | /'/. III. f. .■). resembling the anterior ambulacra] indentations 

 of some specimens of Encope Michelini (Pi. .Ml'./. ;. Rev. Ech.). The am- 

 bulacral furrows are broad, shallow ( /'/. ///./'. /): the two main branches 

 diverge towards the edge, where they send off thin marginal shoot<. rami- 

 fying but once or twice ; the main branches send off short, narrow, usually 



simple branches. As in all Encopidoe the median ambulacra! and interambu- 



lacral Bpaces OH the actinal side are Covered by elongate triangular bands of 



large sunken tubercles, largesl nearest the actinostome in the interambu- 

 lacra, and nearer the edge in the ambulacra; while on each side of the 

 ambulacral furrows the tuberculation is minute and uniform. Posterior inter- 

 ambulacra! lunule with raised edges on the abactina! side. Tuberculation of 

 ahactinal surface uniform. Five distant genital pores. Petals resembling 



those of Mellita. uniformly petaloid. somewhat open at extremity. The 



characters of this genua seem to -how thai we can consider Monophora only 

 a subgenus of Encope, as well as Ravenellia of Liitken I uon McCradj ), which 



