Dr. Th. M. Fries on nexc Species of Lichens. 25 



joined hj a notch and ledge to the second pair of antennse, and^ 

 together with the hitter, joined to the eye-margins, whereby a 

 kind of imperfect sucking-cup is formed. In Caligini, on the 

 other hand, the basal joint of the first pair of antennee coalesces 

 with the sucking-cup, now developing a pair of independent 

 small suckers {Caligus)^ and now forming the so-called lamina 

 frontalis. A vestige of the true front plate is, however, some- 

 times to be observed, namely the scar indicating the place of 

 insertion of the detached organ of fixation. 



EXPLANATION OF PLATE I. 



Fig. 1, Head of Sphceroma balticum, n., from beneath. 



Fig, 2 a. Head of Serolis Orbignyana, M.-E., fi-om beneath : o, sockets of 



first pair of legs. 

 Fig. 2 b. Prostemum and sphenoid plate of the same, from beneath, with 



the lingua and the maxilliB of the first and second pairs on the 



right side : o, sockets of maxillipeds. 

 Fig, 3. Head of Cirolana borealis, Lilljeb., from beneath. 

 Fig. 4 a. Head of ^ga psora, L., from beneath. 

 Fig. 4:b. The maxillipeds of the same in their conuexion with other 



parts : c, cardo of maxillipeds ; s, stem of ditto ; p, palpus of 



ditto. 

 Fig, 4 c. Right mandible of the same, seen from the inner side : s, the 



stem ; m, the lobe ; p, the palp. 

 Fig, 5. Head of Anilocra Leachii, Kr., from beneath. 

 Fig. 6 a. Head of Cymothoa ccstrum, E., $, from beneath. The maxilli- 

 peds are removed and the sucking-orifice distended : o, sockets 



of the maxillipeds. 

 Fig. 6 b. Right mandible of the same, fi'om the inner side : s, stem ; 



m, lobe ; p, palpus. 



In all the figures, where no other interpretation is given, the following 

 is the signification of the letters :— /, forehead ; a, antennae of the first 

 pair ; a*, antennae of the second pair ; c, clypeus ; /, labrum ; /*, lingua ; 

 in, mandibles ; x, first pair of maxillae ; x*, second pair of maxillae ; 

 p.v, maxillipeds ; /*, sphenoid plate ; s, prosternum ; s*, mesosternum. 



II. — Notulce Lichenologicce. No. XIX. 

 By the Eev. W. A. Leighton, B.A., F.L.S. 

 As Dr. Th. M. Fries's ' Lichenes Spitzbergenses ' will in all 

 probability be in the hands of few persons in this comitry, 

 and as there is a possibility that some of his new species may 

 occur in the northernmost portions of Great Britain, we here 

 extract his descriptions of them. 



1. Lecanora coriacea, Th. M. Fr. 



Crusta crassa, contigua, torulosa 1. verrucosa, luteo-albida (1, 

 in roseum vergente), subnitida. K imbuta primum fulves- 



