434 ANIMAL NATURK OF DIATOMP.^. 



offence to modesty, or culpable charge of vain glory, as 

 applicable to matters of our own as to those of another. 

 Kiltzing, in quoting the name given to this species by 

 me, of necessity condemns the one proposed by himself, 

 since T had previously established, though I had not pub- 

 lished it. He might have spared me one of the two names, 

 but he would not. In the description, he gives the size 

 of the Naviculse -o of a Paris line or 0-027 milhm. 

 But in the figure, with the same power of 420 diameters, 

 he delineates the Naviculse 8 and 1 5 mihimetres long = 

 O'OIO— 0'038 milliin. On the other hand, I have never 

 found the Naviculse shorter than 0'02, or longer than 

 O'OSl, either in the authentic specimen of Kiitzing, or 

 in the numerous ones from the Adriatic. The breadth 

 is constantly a fifth of the length. 



This form, too, is regarded by Kiitzing as a variety of 

 the S. rutilans, I know not on what motive. 



As to Ehrenberg's synonym {Naunema balticum), 

 quoted by Kiitzing ; that author determines the length 

 of the Naviculse ~ of his conventional line ; equivalent to 

 ji^ of a millimetre, or 00069 millim., he draws it no less 

 than 16 millim., and speaks of transverse striae, 18 to 20 of 

 which are included in gj of a line, which, notwithstanding 

 the amplification of 2300 diameters and upwards, are 

 not to be discerned in the figure. 



Monnema Dillwynii, Grev. 



Kiitzing states the length of the Naviculse to be 53th of 

 a Paris line, or 0'0318, but he figures the length as 

 6 millim., with an amphfication of 420, which corre- 

 sponds to0"0142. In authentic specimens received from 

 Berkeley, and corresponding perfectly with Kiitzing's 

 description and figure, I find the length of the Naviculse 

 0'022 millim., the breadth of the primary surfaces 0'007, 

 that of the secondary 0'005. 



