MARYLAND GEOLOGICAL SURVEY 457 



Cannartidium was crushed befoiv the drawing was completed. Under 

 the circumstances it seems best not to attempt to name or describe the 

 form, although it is undoubtedly an undescribed species of Cannartidium. 

 The figure possibly does not ^adequately represent the species. 



Occurrence. — Calvert Formation. Popes Creek. 



Collection. — Maryland Geological Survey. 



Genus CANNARTISCUS Haeckel. 



Cannartiscus ampiiicylindricus Haeckel. 



Plate CXXX, Fig. 19. 



CannartiscHS <(n,phicijHndHcns Haeckel, 1887, ChaL Kept., vol. xviii, pt. i, p. 373. 



Description.—'' Cortical shell thick walled, rough, with subregular, 

 circular jjores, twice to four times as broad as the bars; six to seven on 

 the half meridian, ten to twelve on the half equator of each chamber. 

 Polar tubes cylindrical, on the distal end open (broken off?) nearly as 

 long as the main axis, somewhat narrower than the spherical medullary 

 shell. Pores of the tubes much smaller than those of the chambers. 



" Dimensions.— Main axis (without tubes) 0.17, greatest breadth 0.12; 

 pores 0.00(3 to 0.012, bars 0.003. Length of the polar tubes 0.15, breadth 

 of them 0.03 ; pores 0.003, bars 0.002. 



" Habitat.— Pacific, central area, Station 268, 29,000 fathoms; the 

 same occurs fossil in the rocks of Barbados." Haeckel, 1887. 



Occurrence.— Calyeut Formation. Popes Creek, Plum Point, Lyons 

 Creek. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 Eev. Edward Huber. 



Cannartiscus marylandicus n. sp. 

 Plate CXXX, Fig. 20. 



Description.— Cortical shell thick walled, rough, with an indistinct 

 medial constriction; pores subcircular, irregular in size, two to five 

 times as wide as the bars ; polar tubes very rough and irregular in shape. 



Occurrence. — Calvert Formation. Plum Point. 



Collections.— Uarylarn} Geological Survey. Johns Hopkins University, 

 Eev. Edward Huber. 



