Mr. W. H. Benson on a neiv Pupa and a new Bulimus. 97 



Thallus effuse, much thicker than in the other varieties, pul- 

 verulent, almost tartareous, of a dirty-white, often tinged with 

 tawny yellow (I could not detect any of the minute fibres men- 

 tioned by Acharius, L. Univ. 263), with numerous elevated 

 black points or tubercles, the rudiments doubtless of the lirellse, 

 scattered irregularly. Lirellie numerous, scattered, large, pro- 

 minent, sessile, oblongo- or lineari- elongated, flexuose, more or 

 less acuminate at the extremities, frequently also of the same 

 width throughout, and with rather obtuse points, arranged by 

 juxtaposition chiefly, sometimes by confluence into conspicuous 

 stellate groups of three or more elongated flexuose rays. Proper 

 margins thick, prominent, persistent, rounded and intiexed, more 

 or less wavy. Disk expanded, according to age, either canali- 

 culate and of uniform width throughout, or more or less dilated 

 in the middle. 



Specimens ! in herb. Borrer from Acharius labelled " Opegr. 

 nimbosa modijic. •*' from Schleicher labelled " O. nimbosa," and 

 " O. phaa V. brunnea ;" and from Schserer labelled " Opegrapha 

 nimbosa," according to the form and septa of the sporidia, are all 

 referable to this species. Schleicher^s O. phaa v. brunnea and 

 Schserer's Opegrapha nimbosa are identical wnth each other, as is 

 also Opegrapha phaa, Moug. and Nestl. Stirpes, 954 ! . 



Plate V. fig. 9. Sporidia. 



[To be continued.] 



IX. — Characters of a new European Pupa, and of a new Austra- 

 lian Bulimus. By W. H. Bkxsox, Esq. 



The following very interesting Pupa being undescribed either 

 in Pfeiffer^s or Kiister's works, and not being contained in Mor- 

 tillet's recent Catalogue of the South-Western species of Europe, 

 in which list a new Helix and a new Bulimus, from Nice and its 

 neighbourhood, are enumerated, I am induced by its fortunate 

 discovery, at an early period of my residence here, to lose no 

 time in describing such an important acquisition to the ftalian 

 and European fauna. I take the opportunity of publishing at 

 the same time a beautiful addition to the Australian Bidimi 

 brought to England by Dr. J. F. Bacon, whose health, severely 

 shaken by a tropical climate, has ultimately rendered necessary 

 a premature return to his native land. 



Pupa Rivierana, nobis, n. 8. 



Testa rimato-perforata, exacte cylindrica, diapliana, nitidula, fusco- 

 comea, minutissime oblique costulato-striata ; sutura profunda, 

 Ann. ^- Mag. N. Hist. Ser. 2. Vol. xiii. 7 



