130 



appears to be a little more booked than it is in tbe Anisomyon from Van- 

 couver Island, but at present no other appreciable difference can be noted 

 between the specimens from these two localities. 



AcM^A. (Sp. undt.) 

 Plate 16, figures 6 and 6a. 

 Compare Acmiea Tejonensis, Gabb.— Pal. Cal., Vol. II., p.<l72, pi. 28, fig. 56. 



Shell depressed conical, sides sloping obliquely and regularly in all 

 directions ; outline of base elliptical, but perhaps a little wider anteriorly 

 than posteriorly ; apex sub-central, situated slightly in advance of the 

 middle, apparently conical and erect, not curved distinctly forwards. In 

 a cast of the shell, when examined with a simple lens, the apex appears to 

 be divided into two nearl}^ equal halves by a minute, short, transvei'se, 

 groove, and the anterior half is seen to be marked by two equally small 

 and short longitudinal ridges. On the interior of the test, Avhen viewed 

 in the same way, a minute, transverse tubercle can bo detected, which 

 probably causes the transverse division of the apex visible in the cast, but 

 the markings of the interior, which correspond to the longitudinal ridges 

 on the anterior half of the cast of the apex, cannot be clearly made out. 



On each side of the interior of the test and of the outer surface of the 

 cast there is a curved, oblong, muscular scar, whose outline is very- 

 similar to that of a bean, except that it is obliquely truncated behind. 

 At the posterior end these two scars are distinctly connected by a nearly 

 sti-aight, rather broad band, which unites with the inner half of their 

 truncated ends. In front, also, the two lateral scars seem to be con- 

 nected, but very obscurely, by an ill-defined, narrow, irregular, but 

 somewhat semi elliptical line of attachment either of the muscles or of 

 the mantle. 



The sculptm'e of the exterior is unknown, and the outer sm-face of the 

 apex has not been seen, but radiating and rather broad bands of colour 

 ai-e more or less visible on the interior of the test. 



Nanaimo Uiver, V. I., two miles and a quarter up, in Division A ; J. 

 Eichardson, 18*72. A single specimen, broken into two halves, in one of 

 which the whole of the interior of the shell is exposed, the outer surface 

 being covered by rock, while the second is a beautifully preserved cast of 

 the first. 



It is quite likely that the fossil above described may be an adult indi- 

 vidual of Acmcea Tejonensis Gabb, but until its characters are better known 



