THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY 



[SECOND SERIES.] 



" perlitora spargite museum. 



Naiades, et circilm vitreos considite fontes : 

 PoUice virgineo teneros hic carpite flores : 

 Floribus et pictum, divse, replete canistrum. 

 At vos, o Nymphae Craterides, ite sub undas ; 

 Ite, recurvato variata corallia trunco 

 Vellite muscosis e rupibus, et mihi conchas 

 Ferte, Deae pelagi, et pingui conchylia succo." 



N.Parthenii GiannettasH Ed. 



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. 



[With a Plate.] 



1 HE discovery of the mode of reproduction in the Diatomesg 

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

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

 dilated like those of (Edogonimn, 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, 

 Gomphonema rrmiutissimum, G. n. s. ?, Cocconema lanceolatum and 

 Cistula, and in Epithemia gihba % ; and subsequently in Melo- 

 seira varians and Borreri, Aulacoseira crenulata, Cyclotellat 

 Kiitzingiana, Orthoseira Dickieii, Schizonema eocimium, subco- 



* Ap. Meneghiiii " On the Animal Nature of Diatomese," &c., 1845. 

 Eng. Trans, by C. Johnson, p. 369. Ray Society's Publications, 1853. 



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



I Idem, p. 343. pi. 22. 

 Ann, ^ Mag. N. Hist. Ser. 2. Vol, xvii. 1 



