40 Notes on Diatomacezx. ee ee 
sand, which a small diatom will move; and in Colletonema I have 
seen the tough tube membrane bent inwards so as almost to collapse 
by such a crowding as I have mentioned. 
As I have mentioned Mr. Kitton’s paper in ‘ Science Gossip,’ I 
must here take the opportunity of saymg something in regard to 
that article, and I feel sure that he will not take amiss what I shall 
say when he understands the spirit in which it is written. 
First, I wish it to be understood that the specimens and the 
letter accompanying them were sent to Dr. Arnott for his opimion ; 
thereafter I mtended to publish the facts treated of myself. How- 
ever, as Mr. Kitton bas made public his opinions on the specimens, 
I will now give mine; but the fact of its being a private letter of 
mine from which he quotes, and one never meant to be made public, 
must explain what 1 there say. He has considered the ‘ queer 
form” to be a new Fragillaria, and has named it Crotonensis. Kvi- 
dently he does not agree with that portion of my letter which he 
quotes, when I say: “I am not in favour of naming forms after 
places or persons, but strongly incline to distinctive and descriptive 
names.” If the form were a new species I should have named it 
myself; but Dr. Arnott at once said it was likely to be Fragillaria 
capucina var. y, and such I see Mr. Roper points it out to be, m 
the July number of the same periodical. 
As it may be of interest in connection with this point, I may 
say that in a previous specimen of the sediment from the Croton 
water which I had sent him, Dr. Arnott informed me he had found 
the following species: Cymatoplewra elliptica, Navicula trinodis 
and gibberula, Surirella craticula, Denticula obtusa, Hpithemia 
zebrina, Cocconeis Thwaitesii, Achnanthes ventiicosa, Cyclotella 
yotula and operculata, Orthosira orichalcea, Gomphonema tenellum, 
and another intermediate between dichotomum and intricatum, most 
likely the latter— Payer read before the Boston Society of Natwral 
History, February 9th, 1870. 
