72 Miscellaneoiis. 



became an integral part of its cortical system. The vessels which 

 are seen connected in direct lines with the petioles below and above 

 the node, as they are in existence before the leaf-bud has opened and 

 the leaf-blade has had any chance to elaborate sap from the light or 

 air, just above supposed to be necessary before they could be formed, 

 do not seem to originate at the node ; while the fact that these 

 vessels suddenly curve from the opposite side towards the supposed 

 petiolar base is much more characteristic of an unfolding sheath than 

 of a descending current of matter, which would most naturally go 

 down in a straightish line. But that the petiole has really adnated 

 w^th the stem in this way in Liriodendron seems most probable from 

 the fact that on the opposite side from the leaf is often seen a ridge 

 which could hardly be formed except by the meeting of two edges 

 enclosing a stem, with a little to spare ; and at other times there is 

 a slight depression, as if the two opposite edges barely met. There 

 seems to be every evidence short, of an actual witnessing of the fact, 

 that the petiole in Liriodendron became adnate with the stem, and in 

 this way the two lateral sections (stipules) were brought into contact 

 with the stem with which they united. This would bring them 

 nearer the sources of nutrition, and enable them to assume a more 

 leaf-like and permanent character than if on the petiole. They 

 become rather primary than secondary leaf-organs ; and this is just 

 what we see them to lae. 



Thus we may assume that Magnolia has typically a ternate leaf- 

 structure, that the stipules are the two lateral lobes, which, by a 

 peculiar process of adnation, became stipular sheaths after having 

 been partially organized as leaf-blade, and that Liriodendron differs 

 from Magnolia only in possessing a greater power of adnation. — Proc. 

 Acad. Nat. Sd. Philad. Oct. 1870. 



A BemarTcahle Myriopod. By Dr. A. S. Packard, Jun. 



"While looking over a chip with Myriopods and Poduras on the 

 underside, brought in from the museum grounds by Mr. C. A. 

 Walker, I detected a lively little yellowish-white creature, which 

 immediately suggested Sir John Lubbock's Pavrojms. A closer 

 examination showed that it was indeed a species of Pauropus, very 

 closely allied to P.jyedtmculatus, Lubbock, and intermediate in some 

 respects between that species and P. Jlvxleyi, Lubbock. It may be 

 called Paurojnis LuhhocTcii, in honour of the original discoverer of 

 this remarkable type of Myriopods. Ifo more interesting articulate 

 has been discovered for many years ; and the occurrence of a species 

 in America is worthy of note. It has but nine pairs of legs (three 

 pairs when hatched), and in some points in its organization seems 

 to be a connecting link between the Myriopods and Poduridae, the 

 latter being true insects, probably degraded N"curoptera. Our species 

 is yellowish white, and -03 of an inch in length. Mr. Walker 

 assures me, after seeing this specimen, that he s^aw a similar one 

 last May under the bark of an apple-tree in Chelsea, Mass. — Ame- 

 rican Naturalist, vol. iv. Dec. ] 870. 



