Miscellaneous. 227 



cavity of whicli is directed inwards ; the other has a very elegant 

 transverse section (fig. 1). It is shaped hke a dumb-bell, one head of 

 vphich rests within the concavity of the crescentic bundle, and the 

 other turns in the opposite direction ; at each of these two extre- 

 mities the margin of the dumb-bell is excavated into a small bay, as 

 if a vertical canal had existed at each point ; but these seem to have 

 been merely columns of cellular tissue encroaching upon the rounded 

 outline of the vascular structures. I propose provisionally to recog- 

 nize these two forms under the generic name of Arpexylon. 



Fig. 1. Arpexylon duplex. Fig. 2. Arpexylon simplex. Fig. 3. Edraxylon. 



Fig. 3 represents a stem or petiole in which the section of the vascular bundle 

 presents the form of a chair or seat, and to which I propose to assign 

 the name Edraxi/lon . This form exhibits numerous modifications of the 

 jjattern represented in the outline, down to a single central vascular bundle. 

 It may prove to belong to Didyoxylon Oldhamium. 



MISCELLANEOUS. 



On the Specific Name of the Blade Uedstart. 

 By Alfred Newto^!*-, M.A., E.E.S. 



Dr. Gray's note " On tho name Tethya and its Yarieties of Spell- 

 ing" in the last Number of the 'Annals' (p. 150) reminds me 

 of a still greater diversity which has long existed among ornitho- 

 logists as to the spelling of a name which at first sight looks as if it 

 might have something in common with that of TetJiya. 



In 1769 Scopoli (Annus I. Historico-naturaiis, p. 157) charac- 

 terized a now well-known bird as " Sylvia tifhys,''' with a reference 

 to " Linn. S. N. XL n. 23." The eleventh edition of Linnceus's great 

 work is not at present accessible to me ; but it was notoriously a mere 

 reprint of his tenth edition (1758), of which a copy is now before 

 me. Here (i. p. 187) we have the 23rd species-of the genus Mota- 

 cilla designated " Titys,^' and a reference to " Fn. svec. 227 ; " but 

 this, as Linnaeus in his twelfth edition (i. p. 335) allowed, was the 

 female of his M.phcenicurus, and Scopoli was unconsciously the first 

 to give a binomial title to the species we now know as the Black 

 Redstart ; in so doing, however, he misspelt the word, introducing 

 an 7i into the name, and in consequence opened a door for a great 

 number of future errors, while puzzling naturalists to account for it. 



Linnteus, in his mode of spelling, copied Gesncr, who in 1555 

 (Hist. Anim. iii. p. 719) has titys; but the latter also mentions that 



