Plants collected by Mr. Schomburgk in British Guiana. 441 



individuals are generally of a light grey colour. When placed 

 in a basin of sea-water it appears sluggish, but it burrows in 

 loose sand with much rapidity, being enabled to do so by the 

 play of its innumerable feet. 



Plate XXIII. Fig. 6. The proboscis of Sigalion Boa removed and laid 

 open. Fig. 7. The head and anterior segments seen from above. Fig. 8. 

 The head on the ventral aspect to show the mouth and origin of the palpi. 

 Fig. 9. A scale from near the middle of the body. Fig. 10. A side view of 

 a foot. Fig. 11. A bristle from the dorsal ramus of the foot, unjointed but 

 finely serrulated on one side. Fig. 12. Another bristle from the same ra- 

 mus, slenderer and quite smooth. Fig. 13. A bristle from the indentation 

 of the foot between the dorsal and ventral rami. Fig. 14. A bristle of the 

 ventral ramus. Fig. 15. Another bristle of the same, situated under the 

 former and consequently next the ground. 



XLIX. — Enumeration of Plants collected by Mr. Schom- 

 burgk, British Guiana. By George Bentham, Esq., 

 F.L.S. 



[Continued from p. 111.] 

 COMPOSITE. 



37. Leria nutans, DC. Prod. vii. p. 42. — British Guiana. Schomburgk, 

 n. 689. 



Since the publication of my former article on Mr. Schomburgk's 

 plants another package has been received from him, in which the 

 Wulffia platyglossa has been again sent under the number 705, and 

 the following additional species : 



38. Porophyllum latifolium, n. sp., herbaceum, erectum, foliis longe pe- 

 tiolatis lato-ovatis obtusis grosse sinuatis ad sinus pellucido-glandulosis, in- 

 volucri squamis mucrone calloso-acuminatis. — Dry Savannahs on the Upper 

 Rupunoony. Schomburgk. 



DiflFers from P. ellipticum in the upper leaves being scarcely longer 

 than they are broad, and rounded, not narrowed at the base. 



39. Bacckaris erioptera, n. sp., caule subramoso pluri-alato, foliis ovatis 

 alisque supra arachnoideo- subtus dense albo-tomentosis, spicis densis subiu- 

 terruptis, capitulis sessilibus, involucris J tomentosis squamis subulato-acu- 

 minatis. — Dry Savannahs on the Upper Rupunoony. Schomburgk, n. 709. 



GENTIANEiE. 

 In the arrangement of this order 1 have followed the excellent 

 monograph lately published by Dr. Grisebach of Berhn, under the 

 title of ' Genera et Species Gentianearum.' 



40. Schultesia stenophylla. Mart. Nov. Gen. et Sp. 2, p. 106, t. 182. 

 Griseb. Gent. 126. — Exacum Guianense. Auhl. PL Guian.i. p. 6S. t. 26. 

 f. 1. Moist Savannahs, British Guiana. Schomburgk. — French Guiana. 

 Leprieur and Herb. Par. n. 143. 



