dIsoii 

 and 

 ihe 

 lasl 



i'.V «>^ 

 wart 



■ (illVilU. 



Ci'J/pfozoon (Old other Ancient Fo!<«ils. 



21:) 



described by biin as a six)ii<,'e, under tlie name Slreptovketufi 

 ocellatioi} and ap))ears to be <^enerically the same with 

 Nicholson's s]»ecies, thou,t,di l)elon^ing to an oldm' foi'nia- 

 tion. These ])odies occur in small rounded or elliptical 

 masses, ]>resenting a concentric structure resend)lin<f tliat 

 of ("ryptoxoon on a small scale. Tuder the microscope, 

 in siieciniens kindlv connnunicated to me by Prof. Seelv 

 and Mr. Wethered, the layers are seen to be made up of 

 nnnute tubes twisted tojretlier in a most comjdicated man- 

 ner. The tubes are cylindrical, smooth, and apparently 

 calcareous, and they do not occupy the whole si)ace, but 

 leave irregular unoccu])ied cavities. The tubes make up 

 the layers and there do not seem to be any distinct 

 se])ara,tinff lamina- between the layers, or any included 

 earthy mattcir. In tliese resj)ects they differ structurally 

 from Crvptozoou, and are certainlv at least *'enericallv 

 distiiu't, though having some resemblance in general 

 maimer of growth. 



(lirvaneUa gives us little assistance in determining tlie 

 aHinities of ('y]»tozoon, and ics own relati»>nships have 

 lieen very variously interi)reted. It has l»een referred to 

 Hvdroids, I'rolo/oa anil even to Alua-. I'rof. Penhallow, 

 iiowever, who has examine<l my specimens, does not seem 

 inclined to refer it to the latter, though it has certain 

 resemblances to some of the Siphonea'. IV'rhaps the 

 most ])robablc conjectuie as to its athnities is tliat 

 advanced by Xicholson,'^ who com])ares it with the recent 

 lul)id()us Forannnifora of the genera Syringauimina and 

 Hy])erammina of lUady, whose tests ]):'esent mas.ses of 

 tortuous and in some forms branching tubes, sometimes in 

 concentric layers. 



I have recently been able to extend the range of this 

 curious organism downward, by the discovery in a b(»ulder 

 in a conglomerate at Little Metis of nuic 'Us examjiles 



1 Aiiu'iicaii .louiiml of Sciencii, ISS'i. 



4 Nicholson and Lydeker, Manual of Palii-ontology, 188i», i'. 127. 



M 



