340 Notes on New Species 



valves are, I believe, smooth and imperfectly silicious. 

 Several figures illustrating the growth of this species may 

 be found in Mic. Journ. Vol. IV., PI. VII. 



Fig. 46. Tekpsi.noe magna, Bail., nov. sp. Very large, 

 oblong, quadrangular, with a variable number of note-like 

 costsB, but with no transverse bars ; side view like that of 

 Terpsinoe mvsica, Ehr. ; valves minutely granulate, as in 

 T. musica ; connecting membrane minutely, decussately 

 punctate. 



Figs. 50, 51. Terpsinoe tetragramma, Bail., nov. sp. 

 Small quadrangular ; each valve marked with two inward- 

 bent costae ; connecting membrane marked with two hori- 

 zontal and one vertical bar, which do not cross the valves. 

 Side view consisting of one large, nearly circular inflation, 

 with two small terminal compartments ; puncta fine. 



Hah. Para. 



Fig. 54. Terpsinoe minima. Bail., nov. sp. Small, 

 quadrangular, with slightly undulate ends ; valves divided 

 into three compartments (?) by two transverse bars at each 

 end, and one at the centre, which cross the valves and 

 connecting membrane ; valves also marked by two short 

 costaB on each side of the central single bar. 



I have here ventured to describe, as new and distinct 

 species, no less than three forms more or less resembling 

 Ehrenberg's Terpsinoe musica. Figs. 52 and 53, which 

 also occurs in this locality. These figures were doubtless 

 originally drawn as distinct, and were intended in part to 

 illustrate the variability of the bars and music-like costae. 

 It is probable that at this time my father regarded the num- 

 ber of these notes as of specific importance, as appears from 

 the names tetragramma and octogramma severally assigned 

 to them. These can hardly now be accepted as specific 

 characters, but in the forms here represented we have other 

 and much more marked dillerences. Thus Figs. 60 and 

 54 diflcr not only in the number of constrictions, but 



