51 



fpherical. Soon after my defcription of this fpecies went to prefs, Mr. 

 Woods difcovered it with the filaments conjugated. 



39. decuffata. C. filis fimplicibus, demum conjugatis, lutefcemibus, lubricis ; 

 articulis bipuncTiatis diametro fub-triplo longioribus. 



C. decujfata. Vaucher. Hifi. des Conf. p. 76. t. 7. f. 3. 



This fpecies is found in the fame fituations and is clofely allied with C. 

 bipunclata, but may be diflinguifhed by its more (lender filaments, the 

 fmaller fize of the fpots, and the greater length of its joints. 



40. genuflexa. C. filis fimplicibus, demum hie illic genuflexis, conjugatifque, 

 fragilibu?, flavefcentibus lubricis ; granulis in lineas horizontales coarcer- 

 vatis. T. 6. and T. C. 



The feed defcribed in my Introduction, is reprefented in Plate C. mag- 

 nified 1. 



*** anajlomofantet. 



41. reticulata. C. filis anaftomofantibus, reticulatis, in maculas fub penta- 

 gonas coadunatis. T. 97. 



C. articulis folutis. 



42. diJJiUens. C. filis fimplicibus, ftrittis, fragilibus, lecte viridibus ; dillepi- 

 mentis plerumque folutis ; articulis diametro dimidio brevifiribus. T. 63. 



43. peElinalis. C. filis fimplicibus, ftri£Hs fragilibus, compreffis cinereis, 

 plerumque acuminatis ; diffepimentis fcepe folutis ; articulis diametro triplo 

 brevioribus, medio pellucidis. T. 24. 



Drs. Mohr and Weber, in their German tranflations of this work, exprefs 

 their opinion very decidedly in favor of uniting C. peSinalis and C. Jloccu- 

 kfa, but I muft confefs I have feen nothing to induce me to depart from 

 my former fentiments that they are quite diftinct. 



This and the following fpecies of the fame divifion belong to the genu* 

 Diatoma of Decan lolle, and are by means of C. diJJiUens united to the 

 other Confervas. 



G 2 



