Notice of Ehrenberg's Memoir on Microscopic Life. 305 



Many of the species for which Ehrenberg has here furnished the 

 names are new. We take this opportunity to mention that Eh- 

 renberg has been misled by the outline figure 28, and has sup- 

 posed it to represent a carinated Euastrum, which he has conse- 

 quently named Euastrum carinatum. It is not carinated. The 

 species fig. 8, PI. II, which he doubtfully refers to Biddulphia? 

 Icevis, does not appear to us to belong to Biddulphia. Its cylin- 

 drical form and various other characters assimilate it more closely 

 to Gallionella. It also appears allied to Actinocyclus. The species 

 referred to Pinnularia have been separated from the old genus 

 Navicula. We do not think that fig. 29 is a young state of 

 Euastrum Crux Melitensis, as we have seen adult specimens still 

 retaining the usual form. In continuation Ehrenberg remarks : 



" Among these fifty three species of infusoria, seven are peculiar, 

 and are indicated by stars. Prof. Bailey's observation of the living 

 dentate species of Eunotia is of particular interest, as they have not as 

 yet been detected in Europe in the living state, although the shells are 

 numerous in the Bergmehl from Sweden and Finland. As I have reason 

 to suspect that some of these forms while living form bands like Fragilla- 

 ria, and consequently belong to the genus Himantidium, it is particularly 

 desirable that attention should be directed towards them. It is possible 

 that such bands have been confounded with Fragillaria pectinalis.'''' 



Ehrenberg then presents a list of sixty nine recent organic 

 forms from West Point, observed by him in a living state at Ber- 

 lin, and illustrates them by forty Jive beautiful colored figures. 

 The whole number of independent microscopic organisms known 

 to Ehrenberg as existing at West Point is one hundred and thirty 

 three, belonging to thirty six genera, of which only one (Am- 

 phiprora)is extra-European. 



Connecticut. — In mentioning specimens of fossil infusoria from 

 Connecticut Ehrenberg states, that though sent by B. Silliman, 

 Jr. in 1838, he did not receive them in Berlin until October, 1840, 

 owing to accidental delay in England. He then gives full lists 

 of all the species noticed by him from Andover, New Haven, and 

 Stratford, and erroneously attributes to Prof. Bailey the discovery 

 of these localities.* The most interesting remarks concerning 

 these lists are the following : 



* The specimens alluded to were obtained by B. Silliman, Jr. and the late Rev. 

 James H. Linsley. 



Vol. xlvi, No. 2.— Jan. -March, 1844. 39 



