154 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



YoLDiA ARATA, Whiteaves. 



Yoldia arata, Whiteaws- 1884. Geol. and Nat. Hist- Surv. Can., Mesoz. Foss., 

 vol- I., p. 233, pi. 31, figs. 4 and 4a. 



East side of Winter Harbor, Forward Inlet, G. M. Dawson, 1885 : a 

 few casts of the interior of the shell of a small Yoldia, which ai'e some- 

 what doubtfully referred to this species. 



AsTARTE Oarlottensis. (N. Sp.) 



Astarte Packardi, Whiteaves (as of White). 1884. Geol. and Nat. Hist- Surv. 

 Can., Mesoz. Foss., vol- I-, p- 229, pi. 30, figa. 6, 6a and 6b; but 

 po.?sibly not A- Packardi, White, 1880, U. S. Geol- Surv-, 

 Contr. toPaL-cont., Nos. 2-8, p. 149, pi. 37, figs. 6a and b. 



Shell moderately convex, somewhat compressed at the sides, very 

 inequilateral: marginal outline varying in different individuals from 

 subcircular to transversely subovate : length and height equal in the 

 subcircular specimens, whereas in the ti-ansversely subovate examples 

 the length exceeds the height by rather more than one fourth : hinge 

 margin descending abruptly and concavely in front and convexly and 

 much more slowly behind : umbonal region somewhat tumid, beaks 

 not very prominent, directed forwards and placed about half way be- 

 tween the centre and the anterior margin. 



Surface marked by numerous and regularly disposed, narrow and 

 acute concentric ribs or plications, and by minute stria3 of growth. 



The hinge dentition consists of two ti-ansverse cardinal teeth in each 

 valve but there are no lateral teeth. In the right valve both teeth are 

 most prominent in the middle, but the jiosterior cardinal tooth is tri- 

 angular in outline and larger than the anterior. The inner margin of 

 the valves below and at the sides is simple in some specimens and dis- 

 tinctly crenulated in others. 



In a lai-ge specimen with nearly circular outline the maximum length 

 and height are both thirty millimetres ; in a transversely elongated 

 specimen, the length is twenty-six mm., and the height twenty. 



Bast side of Alliford Bay, Moresby Island, Q,C.I. ; four large and 

 beautifully preserved specimens with the test preserved, and a few frag- 

 ments : south side of Alliford Bay ; abundant in the condition of small 

 but perfect casts ; east end of Maud Island, in Skidegate Channel, 

 Q.O.I., five small samples vrith the test preserved : all collected by 

 G. M. Dawson in IBTS. 



The three or four imperfect and badly preserved casts from the fel- 

 sites of the Iltasyouco Eiver, B.C., which were provisionally identified 

 with the A. oentricosa of Meek on page 155 of the Eeport of Pro- 



