502 Dr. Eiiiar Loiiuberg on a new 



generally recognised to be somewhat unreliable. In my 

 Scottish material the number varies from 11 to 20, with an 

 average of 17. The averaj^e numbers for the North African 

 specimens are: — Tunis, 15; Tilghemt, 19 ; Lagho\uat, 18. 

 Lilljeborg gives 16 for typical A. cancrifoimis. With 

 regard to this character, all Ghigi's species are rather distinct, 

 having in each case very few uncovered segments, but I do 

 not think that too much importance should be attached to 

 this point. 



(4) The number and size of the denticles on the posterior 

 sulcus of the dorsal shield is a character of some importance 

 in comparing species of the cancriformis and numidicus group, 

 but in the former species the variation is considerable and 

 Ghigi's species fall well within its range of variation. Among 

 Scottish specimens the number varies from 20-30 (average 

 26), while the average for the North African form is 30 

 (Tunis) or 28 (Tilghemt). Simon gives the number as 

 28 to 35. 



I conclude from all this that all three of Ghigi's new 

 species should be regarded as synonyms of A, cancriformis. 



There are three other species which have been generally 

 overlooked, but which should also probably be included in 

 A. cancriformis. I refer to Apus haliciensis^ A. lablinensis, 

 and A. varsoviensis of Fiszer (1885). I am unable to read 

 Fiszer's Polish description, but I cannot see in his figures 

 any reason for regarding these species as distinct. 



It must be admitted that the genera Apus and Lepidurus 

 are extraordinarily difficult to deal with s^'stematically, but 

 it is clear that any attempt to found new species within 

 them must be based upon an examination of a large amount 

 of material. 



Literature referred to. 



Braehm, F. " Bemerkungen iiber die Gattung Apusy Zeits. Wiss. 



Zcol. h'i. 1893. 

 Fiszer, S. '' Materiaux pour la faune des Phyllopodes de la Pologne." 



Pauiietnik Fizyjograficzny, v. 1885, pp. 195-201. 

 Ghigi, a. " Ricerche sui Notostraci di (Jirenaica e di altri paesi del 



Mediterraueo." Atti Soc. Ital. Milano, Ix. 1921, p. 161. 

 Keilhack, L. '' Zar Nomeuklatur der Deutschen Phyllopoden." Zool. 



Aunaleii, iii. 1909, p. 177. 



L. — Notes on a new Subfossil Bear from iitueden. 



By EiNAR LoNNBERG, F.M.Z.S., etc. 



[Plate lY.] 



In connection with the notes concerning the Bears of the 



pruinosus group, recently read before the Zoological Society 



of London, it may be of interest to draw attention to 



