THE ANN A L S 



AND 



MAGAZINE OF NATURAL HISTORY. 



[SECOND SERIES.] 



" perlitora spargite museum, 



Kaiades, et circQm vitreos considite foiites : 

 Pollice virgineo teneros hic carpite flores : 

 Floribus et pictum, diva?, replete canistnim. 

 At vos, o Nympha Craterides, ite sub undas ; 

 Ite. recurvato variata corallia trunco 

 Vellite muscosis e rupibus, et mihi conchas 

 Ferte, Dcje pelagi, et pingui conchylia succo." 



N. Parthenii Giannettaiii Eel. 1. 



No. 97. JANUARY 1856. 



I. — On the Conjugation of Cocconeis, Cymbella and Amphora; 

 together with some Remarks on Amphiphora alata (?), Kg. By 

 H. J. Carter, Esq., Assistant Surgeon H.C.S., Bombay. 



[AVith a Plate.] 



1 HE discovery of the mode of reproduction m the Diatomeje 

 through spores, thoiigh inferred by Kiitzing, is really due to 

 Mr. Thwaites. The former, seeing some of the cells in Meloseira 

 dilated like those of (Edogonium, considered it sufficient to declare 

 that this was one way in which the Diatomese were propagated* ; 

 but Mr. Thwaites recognized the process fully in Eunotia turgida 

 in May 1847 1, and then first described and figured it most 

 satisfactorily. He afterwards detected it in Fragilaria pectinalis, 

 Gomphoneina minutissimurn, G. n. s. ?, Cocconema lanceolatum and 

 Cistula, and in Epithemia gibba J ; and subsequently in Melo- 

 seira varians and Borreri, Aulacoseira crenulata, Cyclotella ? 

 Kutzingiana, Orthoseira Dickieii, Schizonema eximium, subco- 



* Ap. Meneghini " On the Animal Nature of Diatomeae," &c., 1845. 

 Eng. Trans, by C. Johnson, p. 36!). Ray Society's Publications, 1853. 



t Ann. and Mag. Nat. Hist. vol. xx. p. 9. pi. 4. 



+ Idem, p. 343. pi. 22. 

 Ann. 6^ Mag. X. Hist. Ser. 2. Vol. xvii. 1 



