// 



27 ■ 



3 , side view ; 3", end view.) C. submediocre diametro quarta parte 

 longius, profunde constrictum '; sinu lineari angusto ; semicellulis 

 perfecte semjcircularibus; angulis inferioribus subrectis, in margine 

 verrucis circiter 18, et intra marginem seriebus i vel 2 concentricis 

 verrucarum ornatis; in centre granulis plerumque 6 in series 2 trans- 

 versas ordinatis; e vertice visis ovato-ellipticis, granulis in medio 

 seriebus 4 ordinatis; utrinquc ternis granulis ornatis ; a latere visis 

 circulanbus, granulis utrinque 2 et in medio seriebus 4 ordinatis. 

 Latitudo isthmi tertia pars diametri transversalis corporis; long. .00 133 

 (=34/'); lat. .0016" (=40//.) 



^ Hab. In a pond, Hammonton, N. J. Collected by Rev. H. D. 

 KitcheL This species is readily recognized by the end or side view; 

 m the former, by the two large marginal granules, and in the latter 

 . by the four rows of smaller central granules. 



BAMBUSINA, Ktz. — B. delicatissima, «r. sp, — B. fasciis prae- 

 longis, nodosis; cellulis cylindricis, diametro (.00023"-. 0003") 4-5-plo 

 longioribus, a medio duabus vittis transversis annuliformibus in- 

 structis; annulis plus elevatis quam latis. Trichomatibus, cum annulis, 

 .0006"— 0007", 



Hab, In a pond, Pleasant Mills, N". J. 



I have deemed this plant worthy of separation from the usual 

 form : it has only about one-third the diameter of the trichoma 

 proper, the rings are much more elevated, and the length of the cells 

 is usually fully four times the diameter. 



EUASTRUM,«Ehrb. — E. merme^ Lund., and E. erosum^ liUnd., 



J 



J. E, divaricatum^ Lund., in pond, 



GONATOZYGON, De By.— G. pilosuai, n. sp. (Plate xiii, Fig. 

 16.) G. cellulis elongatis diametro 12-20-plo longioribus, laxe connexis, 

 cytiodermate plus minus dense spinuloso ; spinis" tenuibus, rectis, 

 hirsutis ; cellulis cylindricis utroque polo non constrictis, nisi cellu- 

 lis terminatibus modice attenuatis, polo rotundato. Diam,, sine 



spmis, .0006 -0006' ; cum spinis .001". 



Separated from other forms mainly by the vesture of hairs. Fre- 

 quent in ponds of New Jersey. 



MICRASTERIAS, Kg.~M, foliacea, Bailey, Prof. Bailey discov- 

 ered this plant in Rhode Island more than thirty years ago. After 

 seven years of searching I have at last rediscovered it in Denmark 

 Pond, New Jersey, where it occurs in abundance. Dr. Nordstedt 

 found it in Brazil. Studying from the somewhat imperfect figure, he 

 made anew var. ornata. There is no doubt that I have the original 

 form, and that the Brazilian plant is the same. A peculiarity of this 

 species is that it is rarely found singly. The polar lobe projects con- 

 siderably, and is furnished with two surface teeth. As the plant mul- 

 tiplies by division, these projecting lobes lap over each other and 

 cling together; they are usually found in series of 4-10. 



V - V ^hA ^ ^ ^ ^ ^m 



In the same pond are also 



^ .....v...^-. v.. Micrasterias 



iruncata^ Corda., one only .002" in length and breadth. M, fnuricata, 

 Bailey, occurred frequently last summer, as did also M. laiiceps-, Nord,, 

 which is the same as Wood's disputata of later date. 



STAURASTRUM, Meyen.— ^/. mmicatum. Breb. St, pecten, 



