REICHELTIA. 



243 



terminal nodule very elongated. Transverse strise only visible with great 

 difficulty, 37 in 1 c.d.m. on an average. Length, 8 to 14 c.d.m. 



Fresh water. Antwerp, Louvain, Brussels. Sussex (W. Sm.). Norfolk (Kitton). Hull 

 (Norman). Ireland (O'Meara). Scotland (H.L. Sm., Type No. 7). 



GENUS 15. REICHELTIA H.V.H., 1895, * n Litt. 



Valve lanceolate, slightly gompho- 

 nemoid simulating an A mphi pleura. 

 Girdle face cuneate. A single species, 

 R. nobilis {Reichelt) H.V.H., found in a 

 fossil state at Hainspach. 



Fig. 43- 



Reicheltia nobilis. 



This new genus is excessively interesting, 

 and we do not know of any analogous one. 

 The valve displays rather delicate transverse 

 costae, separated at the median portion by an 

 elongated hyaline space, simulating the 

 terminal nodules of the Amphipleura, but in 

 these hyaline spaces there is a delicate 

 bifurcated raphe, like that of the large 

 Binnularia, and terminating at the apex in a nodule, while the other end of 

 the raphe, after having traversed a kind of nodule placed in a small depression 

 is prolonged a little further on. Between the costae is a double row of 

 very delicate beads, about 20 in 1 c.d.m. About 7*5 costal in 1 c.d.m. 

 Length of valve, about 9 c.d.m. Breadth at the median portion, about 

 1 c.d.m. 



The figures in the text are from one of my photographs, that of the valve 

 x 600 diameters, and the details of structure x 1000 diameters. This very 

 curious form has the combined characteristics of an Amphipleura, Berkeley a, 

 and Gomphonema. I have been able thoroughly to study it, thanks to the 

 numerous examples which Mr. H. Reichelt has had the kindness to place at 

 my disposal. The photographs have been made with Zeiss objective of 

 i"6o N.A. The examination made with this objective has enabled me to 

 ascertain that the description given by Mr. Reichelt by means of objectives of 

 less resolving power was defective, and did not correspond with the very curious 

 structure of the valves. I have, therefore, with the assent of Mr. Reichelt. 

 ventured to change the name given by its author, and I have great pleasure in 

 dedicating to him this interesting genus. 



