190 PROCEEDINGS OF SOCIETIES. 



Resolved, that the members of the club desire to place on record 

 their unfeigned regret at the loss to science and to the club, 

 caused by the death of their lamented friend, and respected and 

 esteemed honorary member, the late Admiral Jones, F.L.S, 



Idth March, 1868. 



Rev. Eugene O'Meara exhibited JVavicula zanziharica from Dr, 

 E. Perceval Wright's collections at the Seychelles. 



Rev. E. O'Meara likewise exhibited a new species of Actinocy- 

 clus given to him by the Rev. T. G. Stokes. The following is an 

 extract from a communication from the latter gentleman : 



" I have been for some time engaged in examining a quantity of 

 Haliotis shell cleanings, and, owing to the great number of sponge 

 spicules, found it necessary to mount the diatoms by the method 

 of selection, using a simple microscope. There were in it three or 

 four forms similar to that which I send. Dr. Greville, a short time 

 before his death, sent me a slide from a Californian gathering, con- 

 taining three or four frustules of this species. He named it pro- 

 visionally Actinocyclus, but was so uncertain as to the genus, that 

 he was unwilling to give it any specific name. Had he seen it, as 

 I have, floating in fluid, inclined at various angles to the axis of 

 vision, and exhibiting, even under a simple microscope, the cha- 

 racteristics of the genus, his opinion would have been confirmed. 

 This form is not extremely rare, but it is far from common. Under 

 a low power, when at rest, this diatom appears like a plain yellow 

 disc, but when examined under a high power, the radiating lines and 

 submarginal pseudonodule are visible, as well as fine transverse 

 markings, similar to those on Triceratium marylandicum.''' 



Mr. Archer exhibited a couple of authentic specimens of 

 Micrasterias Hermanniana (Reinsch), as well as that author's 

 figure of the same, in his " Algenflora des mittleren Theiles von 

 Franken," t. viii, fig 1. He also showed Grunow's figure of his 

 Micrasterias Wallicliii, given in his paper in Rabenhorst's ' Bei- 

 trage zur naheren Kenntniss und Verbreitunor der Alofen,' t. ii, fia:. 

 21, and this in order, whilst pointing out their great resemblance, 

 to which Reinsch does not allude, to indicate that they may be 

 nevertheless quite distinct. M. Wallichii (Grunow) is furnished 

 with an inflation at the base of the segments, which does not seem 

 to exist in M. Hermanniana, and the ultimate lobes of the former 

 are not so slender as in the latter. Yet they seem to resemble 

 each other quite as much, or more, than many of our common and 

 familiar home forms, which, however, Reinsch himself would com- 

 bine-as single species, but still, if we were equally well acquainted 

 with the two forms in question, we should, perhaps, just as readily see 

 that they were truly distinct. But, be it as it may eventually turn 

 out, the two figures are worthy of comparison by those interested 

 in these forms. 



Rev. E. O'Meara read some remarks in reply to a communication 



