igoi] White — The Genus Whittleseya. io 



v> 



vascular bands become more distinct and separate as they ap- 

 proach the teeth. In the middle of the leaf they are often more 

 diflfuse, thouj*'h they are g-enerally recog'nizable down to near their 

 points of orii^-in. 



The normal aspect ot Whittleseya desiderata is shown in 

 PI. VII, Fif^. I, an enlargement of whose vascular bands is pre- 

 sented in Fig-. \a. In this example the origin of the bands is 

 easily traceable. The original of Fig. 2 is slightly warped or de- 

 formed in the matrix, which gives the apex an unduly contracted 

 form. It is notable, however, that in this specimen, as is often 

 the case in ]V. iindulata and W. Ca^npbelli^ the bands on the ex- 

 treme borders are slightly infolded near the apex, so that one or 

 two of the teeth at each corner are sometimes overlapped and 

 slightly inward inclined. In this specimen is also indicated a trace 

 of a petiole, which would appear to be filainentose, as in JF. micro- 

 phyiia Lx. Whittleseya desiderata is distinguished from W. Daiv- 

 soiiiana by its proportionately smaller and more elongated form, 

 and especially b}' the narrow anJ more numerous vascular bands. 

 The latter, by their number and proximity, suggest ]]'. niicrophylla, 

 but they are neither so dense nor so far blended as in the species 

 last named. In ]]'. microphylla,^ although the dimensions are 

 very similar, the bands are often difficult oi distinction, while the 

 distal margin appears more or less obscurely crenulate. One of 

 the specimens, from West Bay Shore, Parrsboro', Nova Scotia, 

 collected by Dr. Ami in 1899, is somewhat narrower than the two 

 examples figured, though belonging to the same species. Another 

 example, from Harrington River, Station A5 of Dr. Ami's collec- 

 tions, presents, apparently as the result of lateral deformation, a 

 somewhat cuneate form strikingly similar to that of Whittleseya 

 microphylla, with which it agrees in size. The same shale frag- 

 ment contains a normal example to which a part of the petiole is 



still attached. 



Localities. — Harrington River beds, Harrington River, Col- 

 chester Co., N. S., Stations A5 and B5 ; collected by Dr. Ami, 

 1898. Also on the Harrington River in Cumberland Qo., N. S., , 

 Station A7 ; collected by Dr. Ami in 1898. West Bay Shore, 

 Parrsboro, Cumberland Co., N. S. ; collected by Dr. Ami in 1899. 



The specimens are in the collections of the Geological Survey 

 of Canada. 



^ PI. vii, Figf. 7. 



