NO. 1229. CA MBRIA X BRA (_ IIIOI'ODA— WAI.L 'O TT. () 8 9 



shell marked by tine concentric stri.e and rather strong linos of 

 growth, also tine radiating striai. The shell is formed of a few thin 

 lamelliB or layers, as far as can be determined from the fragments 

 preserved on the casts in the sandstone. The longest ventral valve in 

 the collection has a length of 10 mm., with a maximum width of ti mm. 

 The dorsal valve is slightly shorter. 



As shown by the interior cast, the area of the ventral valve is rather 

 long, and extends well forward on the cardinal slopes. It is divided 

 at the center by a narrow pedicle furrow and midway l)y a very slight 

 Hcxure line. The base of the area curves backward over the margin, 

 arching slightly forward before reaching a rather deep indentation at 

 the center. The striie of growth cross the area parallel to its Ixise. 

 The}^ are very sharp and tine and c^uite unifornd}- distributed o\qx the 

 area. Area of the dorsal valve unknown. 



01jstrimt(oni<. — This pretty species occurs in great numbers in tliin 

 layers of brow^n sandstone embedded in a dark shale a short distance 

 below the Olenus zone. In form it resembles 01)(>ln.'< {Limjuhlhi) ino^nA 

 var. (Mceola. It differs from it in having a narrower pedicle furrow, 

 and, upon comparison of a large number of specimens, in l)eing slightly 

 more elongate. It is narrower propoftionatel}' toward the beak. 



Forinatlon and locality. — Upper Cambrian, north side of Kandom 

 Island, between Birch and Sandy Points, Smith Sound, Trinity Bav, 

 Newfoundland. 



OBOLUS (LINGULELLA) SCHUCHERTI, new species. 



General form elongate ovate, ventral valve subacuminate and dorsal 

 valve elongate ovate in outline. Surface marked by fine concentric 

 strite and rather strong concentric undulations or lines of growth; 

 also line radiating stria?, and on some specimens indistinct, rathei' nar- 

 row radiating depressed furrows. 



The outer surface of the inner layers shows radiating strite and con- 

 centric lines of growth. The radiating strias are also present on the 

 inner surface outside of the area of the vascular cavity. 



The shell is formed of a thin outer layer and several thin inner 

 layers or lamella arranged very much as in other thin shells of the 

 subgenus Lingulella. The largest ventral valve has a length of about 

 11 mm.; width, T nnn. A dorsal valve 8 mm. in length has a Avidth 

 of 5i mm. 



Casts of the interior of tlie ventral valve show a well-marked area, 

 with a broad, sti'ong pedicle furrow. The base of the area arches 

 strongly forward. At the center across the pedicle furrow it has a 

 slight backward arch just at the center. None of the specimens show 

 the flexure line or the extent of the area along the cardinal slopes of 

 the valve. The area of the dorsal vah'e is miknown. Non(> of the 

 characters of the visceral cavity or vascular markings are shown with 



Broc. N. M. vol. xxiii— — 4A 



