124 THE PALEONTOLOGY OF MINNESOTA. 
{[Rhinidictya. 
Suborder CRYPTOSTOMATA, Vine. 
Family RHINIDICTYONIDAs, n. fam. 
Stictoporide, ULRIcH, 1890. Geol. Sury. Ill., vol. viii, p. 388. 
Stictoporide (part.), ULRicH, 1882. Jour. Cin. Soc. Nat. Hist., vol. v, p. 152. 
This name is proposed instead of Stictoporide, for the reason that the type genus 
is not, as I have heretofore held, properly expressed by the term Stictopora. Since 
Hall, the author of that name, and others, insist that S. elegantula is the type of Stic- 
topora, it follows that the genus and family as described by me (loc. cit.) cannot stand. 
In my Illinois work, namely, I had taken the stand that S. fenestrata is to be regarded 
as the type, and as that species is unquestionably congeneric with Lhinidictya, Ulrich, 
(Jour. Cin. Soe. Nat. Hist., vol. v, p. 152), the latter was reduced to synonomy. Though 
the minute internal and external details of structure of S. elegantula have not yet 
been made public, enough is known of it to prove conclusively that it represents a 
genus to which S. fenestrata has no claim. This being the case, Rhinidictya will 
stand and inelude fenestrata.* 
Genus RHINIDICTYA, Ulrich. 
Stictopora (part.), HALL, 1847. Pal. N. Y., vol. i, p. 73. 
Stictopora, ULRicH, 1890. Geol. Surv. Ill., vol. viii, p. 388. 
Rhinidictya, ULRicH, 1882. Jour. Cin. Soc. Nat. Hist., vol. v, p. 152;.HALL, 1887, Pal. N. Y., 
vol. vi, p. 20. 
“Zoaria composed of narrow, compressed, dichotomously divided branches, with 
the margins sharp, straight, and essentially parallel; attached to foreign bodies 
by a continuous expanded base. Zocecial apertures subcircular or elliptical, arranged 
alternately in longitudinal series between slightly elevated, straight or flexuous ridges, 
carrying a crowded row of small blunt spines. Space immediately surrounding aper- 
tures sloping up to summits of ridges.” (Geol. Surv. IIL, vol. viii, p. 388.) 
Type: R. nicholsoni Ulrich, Birdseye Limestone, Kentucky. 
This genus finds its strongest development numerically, both as regards species 
and individuals, in the rocks of the Trenton formation. The Minnesota shales of 
this group are especially rich in specimens, and so far as species are concerned, there 
is no other section of the country from which as many are known. Unfortunately, 
however, the various forms of the genus are not by any means easily distinguished 
from each other. It is true also that of those species which have a wide geographi- 
cal range, as for instance from Minnesota to Kentucky and Tennessee, or to New 
oy 
* Wor objeotions to the use of Sulcopora, d’Orb., instead of Rhinidictya, see Geol. Surv. IIL, vol. viii, pp. 683 and 687. 
