238 BOTANICAL GAZETTE. [ October, 
the back of the carpel, while the pair between the dorsal and 
the laterals are the intermediates. In addition to these five 
primary ribs or wings secondary ones may appear (as in 
Hydrocotyle Asiatica), and even become more prominent 
than the primary ones (as in Daucus and Trepocarpus); or 
occasionally even all external indications of ribs may be 
lacking (as in Sanicula). The presence of these ribs or 
on 
The constant occurrence in the outer epidermal region of the 
two distinct layers of epidermal cells suggests that the outer 
they may occur close against the inner epidermal layer, 
centrally in the pericarp section, while in Cryptotenia and 
Erigenia they seem to be developed in the inner epidermal 
layer itself. “In AEthusa, Coelopleurum and Cryptotenia ol 
ucts occur both in the intervals and beneath the ribs. 
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the very thick pericarp. In Zizia there are also smalle 
cessory ducts in the ribs. In Conium there is no develop” 
cells occur just beneath the outer epidermis of the pericarp» a 
m Some species eventually break through it, oar : 
superficial oil vesicles. Anthriscus and some Bupleuru™ 
