366 PALEONTOLOGY OF ILLINOIS. 



This family will provisionally include Streblotrypa, Wortheno- 

 pora, Cydopora Prout, Proutella and Hyphasmopora R. 

 Ether, jr., the last mainly upon the authority of Mr. Vine, who 

 considers the genus related to Stivblotrypa. 



As regards the systematic position of the genera, I should 

 say that Cydopora fungia Prout, is related to the Ptilodictyo- 

 nidae (compare fig. 2b and lie in text with fig. 3c, d, and e, on 

 PI. LXVIII); Streblotrypa compares on one side with Ehombo- 

 pora, and on the other agrees in important features with Intra- 

 pora basalis. In Worthenopora and Proutella, I believe we see 

 the nearest approach to the Escharidze yet known from Palaeo- 

 zoic rocks, but as careful search of many specimens has failed 

 to reveal accessory cells of any kind, it has appeared better to 

 arrange the genera with the STREBLOTRYPHLE than with that 

 family. 



(11) HELIOTRYPID.E: This provisional family is founded upon 

 the peculiar genus Heliotrypa. For its characters the reader is 

 referred to the original description and figures* and to the fol- 

 lowing synopsis of classification. 



V. CHILOSTOMATA: Paleschara Hall, is the only Palaeozoic 

 genus that my present views will admit of placing in this sub- 

 order. As near as I can determine, the affinities of the genus, 

 for which the new family PALESCHARiDJi; is proposed, are nearer 

 to the MEMBRANIPORID^E than to any other. 



*Am. Pal. Bry., Jour. Gin. Soc. Nat. Hist, vol. 6, p. 277, 1883. 



