ON SCOTTISH DESMIDIE.E 105 



Var. minor, n. var. (C. simililatum, R. & B.'s MSS.) Very 

 like the type in form, but smaller and more closely 

 granulated. Length, 60-67 /* > breadth, 48-55 /A; 

 'isthmus, 20-22 /z. (Our Plate II. fig. 1 1.) Very rare. 

 Aberdeen above Loch Etchachan, Ben Macdhui ; 

 Forfar in Canlochan. 



83. C. Z,ogiense,BisseL Not common. Inverness near Brin (Mrs. 



Farquharson) ; Aberdeen Moss of Logic (Cromar), Cambus- 

 o'-May, Dalbagie near Ballater, near the summit of Loch- 

 nagar, Glen Callater at the Breakneck Waterfall and on the 

 Tableland above ; Forfar Canlochan, at the west end of 

 Rescobie Loch ; Perth Glen Tilt and at Lochearnhead : 

 Dumbarton between Loch Lomond and Loch Long (Dr. 

 Watson). (Our Plate II. fig. 15.) 



84. C. lepidum, W. West. Extremely rare. Perth Ben Chroin. 



(To be continued. ) 



DESCRIPTION OF SCOTTISH DESMIDIE/E, PLATE IV. Fig. i. Arthrodesmns 

 longicornis, R. and B., x 400. Fig. 2. Staurastrum horametrum, R. and B. : a, 



end ; b, side (of larger specimen} ; x 400. Fig. 3. S. rostellum, R. and B. : a, end 

 (slightly tilted) ; b, side ; x 400. Fig. 4. S. monticulosum, Breb. : a, end ; b, 

 front ; x 400. Fig. 5. S. cormitiim, Archer : a, end ; b, side ; x 600. Fig. 

 6. S. graniilosnni (Ehr. ), Ralfs, and zygospore, x 400. Fig. 7. S. orbicularc (Ehr.), 

 Rnlfs (forma?}, and zygospore, x 400. Fig. 8. S. polytrichitm (Perty), Rab. : a, 

 end ; b, front ; x 400. Fig. 9. S. setigerum, Cleve. : a, end ; b, side ; x 400. 

 Fig. 10. S. saxonicum, Buln. : a, end ; b, front ; x 400. Fig. II. S. avicula, Breb. 

 (forma?}, and zygospore, x 400. Fig. 12. S. armigerum, Breb., and zygospore, 



x 400. Fig. 13. Xantliidiiim antilopicum (Breb. ), Kg., and zygospore (immature}, 



x 400. 



ON THE FOOD OF UTRICULARIA VULGARIS, 

 AN INSECTIVOROUS PLANT. 



By THOMAS SCOTT, F.L.S. 

 Naturalist to the Fishery Board for Scotland. 



EVER since Darwin, in his important work on " Insectivorous 

 Plants," brought together such a mass of information, some 

 of it of a startling description, bearing on the habits and 

 structure of various species of plants, which, though in some 

 cases differing widely in their position in classification, are yet 



