Dr. A. Krohn on the genus Doliolum and its species. 119 



teraliter suspensa, anatropa. Stylus cum stigmate confusus, 

 demum subreniformi-discoideus, parvus, subcoucavus. Fructus 

 ignotus. — Frutex Guianensis ; folia alterna, oblonga, majuscula, 

 glaberrima, petiolata; racemi axillares, divaricatim ramosi; 

 flores parvi, cum pedicellis articulati. 



1. Discophora Guianensis; — omnino glaberrima, ramulis tere- 

 tibus, substriatis ; foliis oblongis, utrinque acuminatis, apice 

 lineari-angustatis, coriaceis, supra nitidis, nervis sulcatis, 

 venis immersis, subtus fuscis, nervis rubentibus cum venis 

 transversis prominentibus, punctis minutis resinosis notatis, 

 margine revolutis^ petiolo incurvo canaliculate ; racemis axil- 

 laribus petiolo 2-3-plo longioribus, dichotome et divaricatim 

 ramosis, pedicellis bracteatis, bractea oblonga obtusa crassi- 

 uscula pubescenti, floribus cum pedicello articulatis. — Deme- 

 rara. — v. s. in herb. Hook. (Parker). 



The branches are terete with a smooth bark ; the axils are 1 ^ 

 t(j 2 inches apart ; the leaves are quite smooth, thick, and coria- 

 ceous, 8 inches long, 2^ inches broad, on a petiole of ^ to f inch 

 in length : a raceme about ] ^ inch long springs out of each axil, 

 sending out from the base upwards several alternate branches at 

 nearly right angles, which are again divided ; the branchlets and 

 pedicels are slightly pubescent and furnished at their base with 

 a short, obtuse, fleshy bract, covered with short fine hairs ; the 

 ovarium is 4 lines long. Inline diameter; the stigmatiferous disk 

 is about one-third of the diameter of the ovarium ; the calyx and 

 petals are quite glabrous; the latter are linear, submembranaceous, 

 marked with three parallel nervures, and are of a reddish yellow 

 colour when dry*. 



XIII. — Upon the genus Doliolum and its species. 

 By Dr. A. Krohn f. 



[With a Plate.] 



QuoY and Gaimard describe and figure in their work, the ' Voy- 

 age of the Astrolabe' (p. 599. pi. 89. figs. 25-28), a small cry- 

 stalline Tunicary not 2 lines long, which they first discovered at 

 Amboyna, and subsequently found again on the coast of Vani- 

 koro. For this animal they created a genus, to which they gave 

 the very appropriate name of Doliolum, placing it in the near 



* A representation of this species, with analytical details, will be seen in 

 plate 20 of the ' Contributions to Botany.' 



t Wiegmann's Archiv fiir Naturgescbichte, 1852. — Translated by 

 Thomas H. Huxley, F.R.S., Assistant Surgeon R.N. 



