Dr. E. P. Wriglit on a neio Species o/'Pennella. 43 



is to be doubted if this species, the animal being unknown, is a 

 genuine Zonttes. If, indeed, all those species (to which, \\o^- 

 ever, Helix dictyodes^ Pfr., cannot possibly belong) ranged by 

 Albers in his grouj) of Rhytida really are the most nearly related 

 to tnceq^ialisjViY., which I examined, the whole group, under the 

 name given by Albers, might be removed from the series of the 

 Helices and placed among the Testacellidaa ; however, I would 

 caution against so summary a procedure, although convenient, 

 and would rather encourage Australian and other malacologists 

 not to shun the trouble of examining these animals, as, surely, 

 through anatomical investigation the relations between the dif- 

 ferent groups of Pulmonata will be discovered more easily and 

 sooner than by a continual accumulation of shells only. Cer- 

 tainly a conscientious comparison of shells will gradually 

 lead to natural groups ; but, in spite of immense collections, 

 this conchological method will always be slow and at the same 

 time dangerous, for the material available on this field is too 

 easily monopolized. If, instead of the thousands of shells that 

 annually are sent home by collecting travellers, only a few 

 hundred species in spirits, allowing a more minute examina- 

 tion, were one day to reach Europe, such an event might well 

 be hailed by malacozoology. 

 Wiirzburg, December 9, 1869. 



VII. — On a neiv Species of the Genus Pennella. By Edwaed 

 Perceval Wright, M.D., F.L.S., Professor of Botany in 

 the University of Dublin. 



[Plate I.] 



The memoirs of Steenstrup and Liitken in the ' Transactions 

 of the Danish Academy'*, and of Nordmann in the ' Bulletin 

 of the Moscow Society of Naturalists 'f, have added very 

 largely to our knowledge not only of the species of the genus 

 Pennella, but also of the great variation to which several of the 

 species appear liable. The specific characters, however, are 

 for the most part difiicult to determine ; this is fully recognized 

 by Professor Claus in his memoir on the LernteidEe J. This 



* " Bidrag til Kundskab om det aabne Havs Snyltekrebs og Lernseer 

 samt om nogle andre nye eller bidtil kun iifuldstasndigt kjeudte parasi- 

 tiske Copepoder," Vidensk. Selsk. Skr. 5. R., Natuxvidensk, og mathem. 

 Afd. 5. Rd. 1861, pp. 341-432, tab. 1-15. 



t " Neue BeitrJige ziir parasitiscber Copepoden," Bull. Soc. Imp. des 

 Naturalistes de Moscou, 1864, tom. xxx^ii. pp. 461-520, Taf. 5-8. 



I ' Beobachtimgen iiber Lerncrocera, Peniculus und Ler7icea, ein Bei- 

 trag zur Naturgeschicbte der Leruaeen,' Marburg & Leipsig, 4to, pp. 1-32, 

 Taf. 1-4 : 1868. 



