NO. 1442. JAMES TYPES OF BRYOZOA—BASSLER. 33 



species with internal and also external characters different from either 

 of the figured types is stated to have the same internal features. It is 

 work of this character that is so disheartening to the conscientious 

 student. That James\s species does not deserve recognition need 

 hardly be stated. 



COELOCLEMA ALTERNATUM (James). 



Ceratnopora alteruata James, I*aleuntologist, No. 1, 1878, p. 5. 



MonticuUpora (FistuHpora) (ilfernata James and James, Jour. Cincinnati Soc. 



Nat. Hist., XI, 1888, p. 84, pi. i, tigs. 5-5/^ 

 Voelodema alternatmii Nickles and Bassler, Bull. U. S. Geol. 8urv., No. 173, 



1900, p. 212. 

 Diamesopora vaupeli Ulkich, Geol. Surv. Illinois, VIII, 1890, ]>. 4H8, pi. xxxix, 



figs. 3-36; pi. XLi, figs. 4-4r. 



OrUl'nial de><oriptioii . — "'Polyzoar}' consisting of hollow, branching, 

 cylindrical, or compressed stems from one to four lines in diameter, 

 with irregular swellings; the hollows tilled with foreign matter (clay). 

 Cell apertures of the most perfect specimens, elevated, oblique, arched, 

 subcircular, or oval; five or six in the space of a line, including the 

 interspaces; generally arranged in alternating rows, sometimes in a 

 diagonal manner around the branches. Spaces between the cells 

 equal to their diameter, or a little more or less on different examples. 

 Slightly cut longitudinal sections of some specimens show the cells 

 arranged in diagonal, alternating rows of a lozenge-shape, with minute 

 interstitial pores. Distributed over the surface about two lines apart 

 are spots, sometimes slightly elevated, bearing fewer cell apertures 

 and more or less of the small pores. The surface of worn or weath- 

 ered examples — mostly so found — are nearly smooth; destitute in most 

 cases of prominent cell mouths, but show more minute interstitial 

 tubes and divisions than perfect specimens." 



The characters of this species are well brought out in Mr. , James's 

 earliest description, quoted above, and there should be no difficulty in 

 recognizing the form. The illustrations given by James and James 

 in 1888 are of little value, and for a good description and trustworth}^ 

 figures the student is referred to Ulrich's work in 1890. 



The slender, hollow-stemmed branches, with thick-walled, oval zoce- 

 cia arranged in diagonall}^ intersecting lines and arched over by prom- 

 inent hoods — the lunaria — causes the recognition of the species to be 

 an eas}' matter. 



Occurvince. — C. <dternataiii is found usually in great abundance 

 wherever the Southgate and McMicken members of the Eden shale are 

 exposed at Cincinnati, Ohio, and' vicinity. 

 Proc. N. M. vol. XXX— 06 3 



