10 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxix. 



FORAMINIFERA. 



Genus GLOBIGERINA d'Orbigny. 



GLOBIGERINA (?) MANTOENSIS, new species. 



A single specimen of what is prol)ably a species of Foraminifera 

 occurs in a compact gray limestone. It is elongate-oval in shape, 

 convex, and divided longitudinally by a narrow furrow into two lobes, 

 which are marked by more or less irregularly arranged and not very 

 deep depressions at right angles to the central furrow. 



Formation and locality. — Middle Cambrian, upper portion of Man 

 To shale formation; 3.2 miles southwest of Yen Chuang, Hsin Tai, 

 Shangtung, China. 



Collected b}^ Eliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



PORIFERA. 



PROTOSPONGIA Salter. 

 PROTOSPONGIA CHLORIS, new species. 



Of this species only the large primary spiculaj are known. The 

 skeleton is not preserved. The silicious spicules vary in size, but they 

 all appear to be four-rayed. The ra3^s are slender, extending out usu- 

 ally at right angles to each other from the center, but in some speci- 

 mens one or more of the rays is occasionally slightl}" diverted from 

 the right angle; they slope slightly downward from the center to their 

 extremities, which gives a low pyramidal form to the spicule; there is 

 no trace of a central, downward-pointing ray on the under side. Each 

 ray has a rounded angle on its upper side; it is slightly angular at the 

 sides and subangular on the lower side. In many examples the narrow 

 rounded ridge of the upper side is exfoliated, leaving a V-shaped 

 groove lengthwise of the ra}^; the grooves from the fourra3^s unite at 

 the center. 



As a result of the exfoliation of the upper side of the ray there 

 appear to be three forms of spicules: First, the complete spicule, as 

 above described; second, a \Qxy slender spicule with the rays rounded 

 on the upper side and angular on the lower side; and, third, a spicule 

 having a V-shaped groove on the upper side of the rays. 



The spicules above described resemble in general form those of Pro- 

 toH])ongiafenestrataS\x\iQ,v\ the}' differ in the absence of the central 

 ray and the exfoliation of the upper side of the ray. 



Formation and locality. — Middle Cambrian, central portion of 

 Chang Hsia formation, in compact gray limestone; at Yen Chuang 

 and 2 miles south and \\ miles southwest of Yen Chuang, Hsin Tai, 

 Shangtung, China. 



Collected by Eliot lilackwelder, of the Carnegie Institution of 

 Washington ExpcMlition (o Cliiiiu. 



