Ill 1 1 -. 



yellowish ; often yellouMi ii mi the 



ally 'jTeellMl. 'I't 



Green i- tin- more common color in the north, while brown :ip|an 

 to lie universal in 



It is by im means certain that hut one specie- 



:ui.i. I.^JM rial attention -hoiild t)C 



form and dent iculation of the tail valve uf specimen* from ditt< 

 New /calami localities in order to settle this quad mena 



before me >eem to indicate a hut they are 



tri'tly [>nserved. 



A.CAIMN XTT- Adams A- . \ngas. 



Shell elonirated ; valves moderate, stnnr|y carinated, 

 l)ohind ; whitish maculated with reddish-brou n : very closely j,. 



. in the middle smooth and black-brOWO ; lateral area- iiidi.-t in< t. 

 ( .iirdle beset with minute white spicules, and bunches ot 



Length 30, breadth 111 mill. (A. .1. 



Port Jackson, New South Wales (Angas.) 



Acanthochites carinabu An. A- A.9O., I*. Z. S. 1804, p. H>4. 

 &NQA8, I*. /. S. 1867, p. 224. 



A single specimen was collected by Angas. Mr. E. A. Smith has 

 expressed the opinion that it is the same as the European speci- 

 divrepans (Proc. Zool. Soc. Lond. 1891, p. 392), but this view needs 

 confirmation, being founded probably on a study of tin 

 characters only. 



A. ASBESTOIDES Carpenter. PI. 2, fig. 55. 



Shell small, greyish-brown, with a pale line on each side ot 

 middle of the central valves, slightly converging behind, leaving a 

 dark-wedge shaped space between them. Surface < th a 



eoarseish granulation, the grannies being somewhat flattened and 

 those at the vertex of the central valves rather smaller than th. 

 The. lateral areas are not defined in these valves; the posterior 

 curved mar-ins are produced in the middle, at times a ruing 



a ri^ht an^le : their insert ion plates are large, thin, produced ante- 

 riorly with a very slight notch quite close to the hinder D 

 each -idr ; the sinus between them in front is deep and an 

 The first valve has a straiirhter posterior mar-in than t he succeeding 

 ones, and a semicircular outline in front : the lamina 

 rather deep, thin, feehly striated exteriorly, and interi'iip:- 

 very small subequidi>tant notches. The laM valve is conspicuously 

 'I 



