REPORT OF THE DIRECTOR I919 



105 



radial striae and the character of the fold, which is narrow, short 

 and not produced anteriorly. T. nucleus is known from the 

 middle Trenton at Middleville, N. Y., and the Rysedorph Hill con- 

 glomerate. Its occurrence in the Snake Hill shale is another link 

 between that shale and the Trenton limestone. 



Fig. 58 



Fig. 59 



Fig. sSTriplecia nucleus (Hall) , x2. Federal Signal Works, North 

 Albany. Fig. 59 Schizambon albaniensis, nov. Holotype, x2. 



5 Schizambon albaniensis nov. 



Description. Shell of medium size, subeUiptic in outline, about 

 four-fifths as wide as long, widest in the middle, posterior end trun- 

 cate with gently convex cardinal line. Foramen ovate in outline, 

 situated about one-third of length of shell from beak. Surface fur- 

 nished with coarse broad, smooth growth bands which are continued 

 into long bristlelike spines which are straight and longest in the 

 anterior region, toward the posterior region are curved slightly back- 

 ward, reaching a second climax of length near the latero-cardinal 

 angles, and continue as small spines along the cardinal line. 



Measurements. Length of type-specimen 10.2 mm; greatest width 

 8.8 mm; length of cardinal margin 5 mm; length of anterior spines 

 3 mm. 



Horizon and locality. Snake Hill beds at Watervliet near Albany 

 (excavations for the shops of the Delaware and Hudson railroad) 

 and Canajoharie shale at Rural cemetery at Albany. 



Remarks. This species has before (Ruedemann, 1901, p. 529, 

 1912, p. 30, 63) been cited by the writer as Schizambon ? 

 f i s s u s var. canadensis Ami, which is now Schizambon 

 canadensis, a species of the Gloucester shale. From this 

 species our form as here figured from the Snake Hill beds differs 

 in its outline, which is truncate posteriorly and subelliptic instead 

 of ovate ; and further in the direction of the spines in the posterior 

 region which are curved, and continue along the cardinal line. 



