M. E. Hesse on tfie Pranizae and Ancei. 4(K 



ThaUus cartilaginous, growing scattered or in larger or smaller 

 irregular patches, of a pale brownish olive-colour, consisting of 

 moderate-sized, smooth, polished scales, adnate and flattened 

 when growing scattered, with a margin more or less deeply in- 

 cised, the lobes minute, rounded, entire or crenate ; when grow- 

 ing crowded, the scales are convex and gibbous, more or less 

 imbricated, giving a glebulose or coarsely verrucose appearance. 

 Apothecia prominently sessile on the scales, small, numerous, 

 most generally crowded together, confluent and difFormed. 

 Disk flattish, roughened, of a very dark brownish black, slightly 

 polished. Margin moderately thickened, irregular, and very 

 flexuose, prominent, and incurved, of the same colour as the disk 

 and slightly polished. Paraphyses conglutinated into a brownish 

 mass. Hypotliecium dark brown. Asci inconspicuous. Sporidia 

 very minute, ellipsoid, simple, hyaline, their number not ascer- 

 tained. 



Specimens in my herbarium, on pine-wood bark, from Dr. Th. 

 M. Fries and Dr. Wm. Nylander, collected at Upsal, and both 

 apparently identified with Fries's Lich. Suec. 28,have the thalline 

 scales of a richer brown colour than our British specimens, but 

 correspond in the above characters and microscopical details. 



Not to be confounded with L. ostreata, /3 myrmecina (Ach. & 

 Wahl.), from which the convexo-gibbose non-ascending scales 

 keep it distinct, nor with L. Caradocensis, Leight., distinguished 

 by different sporidia (omitting other characters from both). 



Plate IX. fig. 8. Vertical section of anotheciutn and tballus. 

 fig. 9. S|)ori(lia, magnified 1200 times linear, 

 fig. 11. L. Friesii, natural size. 



I would avail myself of the opportunity of stating that Dr. W, 

 Nylander informs me by letter (Oct. 1864) that my Opegrapha 

 anomala, described and figured in 'Ann. & Mag. Nat. Hist/ 

 Feb. 1857, proves to be identical with Graphis Ruiziana, Fee. 



XLIV. — Memoir on the Pranizae and Ancei. 

 By M. Eugene Hesse*. 



AccoEDiNO to an observation made by the author twelve years 

 ago, and communicated by him to the Academy of Sciences in 

 1855, the Praniza and Ancei, instead of forming two distinct 

 groups of Crustacea, are to be regarded as developmental phases 

 of the same form, the Praniza being only Ancei in a larval state. 

 On the 29th of August 1852, he obtained from a Gurnard 

 {Trigla Hirundo) a Praniza, which, having to leave home for a 

 • Abstract from a separate impression of the memoir published in the 

 * Me'moires pr^sentes k rAcade'mie des Sciences.' Communicated by the 

 Author. 



