1894.] NATURAL SCIENCES OP PHILADELPHIA. 81 



Port HackiuLi-, N. S. Wales (Dr. J. C. Cox). 



This species differs from A. f/ntnostrlatiis ia the iucouspiciious 

 tufts, obvious though low diagonal ribs, convex pustules, rounded 

 contour of the insertion- pi ate of the tail valve, etc. 



Acanthochites granostriatus rilslny. Tl. II. tigs. 1, 2, 3, 4, 5, 0: PI. IV, 

 tin-. 37. 

 Nautilus VII. p. 119. Fol). 1894. 



Shell rather elongated. Exposed portion of valves occupying 

 about one-third to one-half the total width (in dried specimens). 

 \'alves moderately elevated and obtusely keeled, the ridge indis- 

 tinctly clouded with whitish, orange and blackish; sides mottled in 

 indistinct and varying pattern with olive and white. Girdle oliva- 

 ceons, tufts silvery stained with blue or dirty olive. 



Intermediate valves having the exposed portions broadly wedge- 

 shaped, truncated in front, decidedly imbricating. Dorsal area of each 

 valve wedge-shaped, rather wide, convex, distinctly differentiated 

 from the pleural areas, but not raised at the sides, sculptured with 

 numerous rather weak longitudinal striai and crossed by slight 

 growth- lines. Latere- pleural areas having no trace of a diagonal 

 rib, sculptured with elongated, concave or fiat pustules, arranged 

 radially, and connected by opaque lines giving the appearance of 

 radial stride. Anterior valve with very slight indications of three or 

 five low rounded radial ribs. Posterior valve having the tegmen- 

 tum subcircular, the niucro rather acute and elevated, situated at the 

 posterior third (PI. II, figs. 2-5). 



Interior of valves pink, becoming salmon colored posteriorly, 

 stained with dark in the middle of the cavity, where there is a dis- 

 tinctly porous longitudinal band. Sinus moderately deep, squared 

 and minutely crenulated. Posterior valve triangular, having an up- 

 ward wave in the straight posterior margin, the postero-lateral mar- 

 gins concave. 



Girdle clothed with short, greenish spicules and having eighteen 

 conspicuous bluish or silvery tufts. 



Length 9, breadth oi mm. (dried specimen). 



Length 10, l)readth 7 mm. (alcoholic specimen). 



Port Jackson and Port Hacking, N. S. Wales (Dr. J. C. Cox !). 



Acanthochites Bednalli Pilsbiy. PL II, figs. 7.8, 9, 10, 11. 



Shell oblong, moderately elevated, carinated, the .side-slopes 



