Mr. J. Miers on the Meuispermacese, 315' 



valde extantibus, acutis, jngo obtuso parallelis, utroque latere 

 circ. xvi. ; valv. term, seriebus buUularum circ. xviii. ; mucrone 

 submediano, inconspicuo ; umbonibus baud prominentibus ; tota 

 superficie minutissime granulosa : intus valvarum lobis mediarum 

 i.- term, circiter x.-fissis ; sinu lato, planato ; suturia planatis ; 

 limbo pallii angusto, minutissime squamulis furvicaceis creberrime 

 instructo ; interdum pilulis intercalatis. Long. -8, lat. -4 poll., 

 div. 125°. 



14. Ischnochiton serratus. 



testa parva, cinerea, olivaceo hie et illic, prsecipue ad suturas, 

 punctata, interdum sanguineo maculata ; ovali, subdepressa, suturis 

 indistinctis ; tota superficie minutissime granulata ; ar. diag. valde 

 distinctis, costis latissimis obtusis ii.-v. munitis, interstitiis nuUis; 

 marginibus posticis eleganter serratis ; ar. centr, costis acutis, 

 parallelis, utroque latere circ. xii. ; jugo obtuso, baud umbonato ; 

 costis transversis, subradiantibus, fenestrantibus, interstitiis im- 

 pressis : mucrone mediano, obtuso ; valv. term, costis obtusis, ut 

 in ar. diag,, circ, xx, : intus valvarum mediarum lobis bifissis, 

 terminalium circ. ix.-fissis ; lobis suturalibus magnis : limbo pallii 

 squamis majoribus, imbricatis, vix striatulis. Long. '34, lat. '2 poll., 

 div. 115°. 



DiflFers from Elenensis in the sculpture of the terminal valves. 

 [To be continued.] 



XXXIII. — On the Menispermacese. 

 By John Miers, F.R.S., F.L.S. &c. 



[Continued from p. 135.] 

 4, TiNOSPORA. 



The first outline of this genus was given in my " Remarks on 

 Menispermacea" in 1851 (Ann. Nat. Hist.). It comprises a 

 group of Asian and African plants, all of climbing growth, the 

 type of which is the Cocculus cordif alius, DC. : the stems 

 have a lax, splitting, membranaceous bark, often furnished with 

 verrucose tubercles. Colebrook and Roxburgh relate, concern- 

 ing some of the species mentioned below, that when any portion 

 of their stems becomes severed, it sends out, even from the 

 greatest height, a sprout which lengthens downwards till it 

 reaches the ground, when it takes root, by which the severed 

 portion continues to maintain its flourishing growth ; and they 

 have seen radicant shoots of this description, 30 feet long, not 

 thicker than a pack-thread. The plants have all roundish cor- 

 date leaves, more or less membranaceous, generally glabrous, 

 upon slender petioles ; their inflorescence is an elongated supra- 

 axillary raceme, with small glabrous flowers; their somewhat 

 globular fleshy drupes contain a spherical, smooth or tubercu- 



21* 



