Prod. 



756 



Productella ? in I. 0. White's Stony Brook leds (pas- 

 sage of Chemung into CatsMll) at Rupert, bed 9 (G7, p. 68, 

 72, 216, 227) ; at'Catawissa, bed 98 (p. 240), bed 37 (p. 197) ; in 

 Mifflin township, Columbia Co. (p. 277); in Shamokin town- 

 ship, Northumberland Co. (p. 365); in Jackson township (p* 

 365). VIlI-IX. 



Productella ? Among StreptorhyncMis ohemungensis^ 



Sjnrifera disjuncia^ etc, sparingly distributed through the 

 1850' or less interval between Hamilton and GatsMll in Mon- 

 roe and Pike Cos., Pa. 06, p. 105. VIII g. 



Productella ? in Huntingdon Co. Shy Beaver section, 



lowest 75' of 300' sandy bedg under Allegrippus conglomerate 

 (T3, 163) ; also in Haun's bridge section, beds 6 and7 (p. 194); 

 also in Pa. RR. section at Huntingdon, blue-gray shale bed 

 55 (p. 264). In Bedford Co. Saxton section, bed 30, 100' under 

 Allegrippus {Chemung lower) conglomerate (T2, pp. 79, 230); 

 also near Union township line, in Chemung flags (p. 133.) In 

 Warren county under the Clean conglomerate^ XII ; and at 

 Johnson's sawmill (IIII, p. 32, 255.) In Venango Co., Benedict 

 farm, near Pleasantville, Spec. 3277 (0, p. 146) in X. In 

 Crawford Co., near Spartanburg, with Strophodonta^ on spec. 

 3258 (O, p. 146); spec. 3263, 2 miles N. ol Titusville; both in 

 X. In Erie Co. characteristic of the Third Oil Sand {Le- 

 liBuff, Panama conglomerate) Q4, pp. 110 249. Chemung. 

 VIIIg,^^il^(iX. 



Productus. A large number of species have been made 

 of this genus, many on superficial grounds. Considering the 

 large vertical range in time of some, and the wide geographical 

 range of others, Mr. Keyes is justified in pronouncing the pres- 

 ent group as in an extremely unsatisfactory condition. (See 

 Proc^ Acad. Nat. Sci. Phila., March-Sept., 1888, page 228). 



Productus biseriatus. ( Hall, Trans. 111. Inst. Vol. 4, 1856. 



