may be found in a recent number of Botanisches Centralbtaft. ]'„1. 66, 

 No. 4, 1896. It is entitled, Der Reis-Braud und der Setaria-Brsind, die 

 Entwicklungsgleider neuer Mutterkornpilze. — Erwin F. Smith. 



ZOOLOGY. 



Respiration of Trilobites. Dr. C. E. Beecber comments as 

 follows on the probable method of respiration of the trilobite genus, 

 Triarthrus. " No traces of any special organs for this purpose have 

 been found in this genus, and their former existence is very doubtful, 

 especially in view of the perfection of details preserved in various 

 parts of the animal. The delicacy of the appendages and ventral 

 )ites and their rarity of preservation are sufficient 

 these portions of the outer integument were of 

 extreme thinness, and therefore perfectly capable of performing the 

 function of respiration. Similar conditions occur in most of the 

 Ostracoda and Copepoda, and also in many of the Cladocera and 

 Cirripedia." 



"The fringes on the exopodites in Triarthrus and Trinucleus are 

 made up of narrow, oblique, lamellar elements becoming filiform at the 

 ends. Thus they presented a large surface to the external medium, 

 and partook of the nature of gills." (American Journal Science, 

 April, 1896.) 



A Criticism of Mr. Cook's Note on the Sclerites of 

 Spirobolus.— I have read with some interest Mr. Cook's description 1 

 of certain lines found upon the rings of a specimen of Spirobolus 

 marginatiut, but I am unable to agree with him in the conclusions 

 drawn from them, nor with his remarks relative to the diplopod seg- 

 ment in general. It seems somewhat surprising that Mr. Cook made 

 no examination of the musculature, either of the specimen described 

 or of any other, to determine whether the lines discovered coincided in 

 any way with lines of muscular attachment, an examination that is 

 necessary to give his conclusions more than a very superficial footing. 

 Had he made the examination, it is extremely doubtful whether he 

 would have found this necessary data, since in more or less closely 

 related forms no lines of attachment corresponding to his lines are to 

 be found. 



1 This journal, p. 333. 



