Prof. Ch. Morren on the Morphology of the Ascidia. 305 



utrinque dente magna emarginato armatus. (Corp. long. "7 unc. ; 

 lat. "175 unc.) 



The general colour gray ; the antennae stout, much com- 

 pressed, brown with the exception of the two basal joints, 

 which are gray ; the head is gray, the eyes being large, round, 

 distant, lateral, very shining, and of a darker colour than the 

 crown of the head which has four tubercles, two nearly erect 

 and rather acute, each situated about equi-distant from a me- 

 dian line and the margin of the eye ; the other two are less 

 prominent, directed forwards and situated between the first 

 pair and the base of the antennae. The prothorax is of a pale 

 whitish ash-colour, the centre of the disk being darker and 

 having a slender impressed black longitudinal line ; the lateral 

 margins are produced into a bifid porrected tooth, the anterior 

 lobe of which is rather acute. The elytra have five ridges, 

 one sutural, two dorsal, one lateral and one marginal : the mar- 

 ginal interstice has a triple row of deeply impressed punctures, 

 the other interstices have a double row : the elytra are ash- 

 coloured, with various brown shades, the ridges nearly white 

 interrupted with dark brown. 



Inhabits the Cape of Good Hope ; a single specimen is in the ca- 

 binet of Mr. Melly. 



XXXVI. — On the Morphology of the Ascidia of Plants. By 

 M. Ch. Morren, Professor of Botany at Liege, Member 

 of the Royal Academy of Brussels. 



Without doubt there are few persons who have not admired, 

 whilst passing through the hot-houses of our horticulturists, 

 the singular structure of the ascidia of Nepenthes, Sa?Tacenia, 

 Cephalotus, Marcgravia and Norantea. The three first of 

 these genera evidently have lids to their pitchers, which are 

 formed at the expense of the foliaceous organs ; but is the na- 

 ture of these reservoirs of water properly viewed by morpho- 

 logists ? is it well understood ? Manv authors confine them- 

 selves to describing them, and few like Lindley, DeCandolle 

 and Link have hazarded an opinion as to their origin. I have 

 been fortunate enough to meet with two ascidia developed by 

 Ann. Nat. Hist. Vol. 3. No. 18. July 1839. z 



