﻿GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 83 



somewhat altered and showed traces of apparently a glau(;onitic 

 interior. 



TRILOCULINA BULBOSA, new species. 



Plate 32, fig. 3. 



• Des(J7'iption. — Test from exterior composed of three visible cham- 

 bers, the last formed one making the largest part of the test. The 

 ]iext to the last about half the size of the last and the first formed 

 one very small in comparison, test in end view nearly biloculine, with 

 the last formed chamber nearly as wide as the whole test in its great- 

 est width, in front view breadth and height about equal, chambers 

 very rotund, sutures deep, aperture without a neck, rounded, tooth 

 indistinct or wanting. 



Length, about 0.65 mm. 



Type-specimen.— (C^t. No. 324728, U.S.N.M.) from the Gatim 

 formation, U.S.G.S. Station 6029^, lowest horizon, one- fourth to one- 

 half mile north of Camp Cotton on relocated line Panama Railroad. 

 Another specimen was obtained, also in the Gatun formation, at No. 

 6030, from fossiliferous marl, from cut on north side of swamp 1^ 

 miles north of Monte Lirio, relocated line of the Panama Railroad. 



In each case a single somewhat glauconitic specimen was obtained. 

 The species has the last two chambers developed greatly, the third 

 one very small, the whole test appearing almost biloculine. The 

 specimens from the two stations were practically identical. 



TRILOCULINA PROJECTA, new speciea. 



Plate 33, fig. 1. 



Description. — Test in end view composed of three radially pro- 

 jecting portions, the intervening portions deeply concave, in side 

 view about as long as wide, sutures somewhat indistinct, periphery 

 broadly rounded; wall covered with a thick encrustation of sand 

 grains giving the whole exterior a decidedly arenaceous appearance; 

 aperture with a slightly projecting neck and phialine lip ; apertural 

 opening circular, in the specimen figured without a distinct tooth. 



Length 0.75 mm. 



Type-specimen. — (Cat. No. 324729, U.S.N.M.) From gray green, 

 fine grained, sandy shell marl from vicinity of Mindi Hill, U.S.G.S. 

 No. 6035, Gatun formation. 



This is an interesting modification of this genus, comparable in 

 the structure of the test to Quinqueloculina agglutinans d'Orbigny 

 and others of the same character. 



