Oil some new and rare Desmids. By W. B. Turner. 935 



the middle ; ends round or a little truncate ; cell-coat lightly- 

 granular or punctate. End view circular. Germany, France, 

 Nova Scotia. The specimens figured are from the latter. 



Long. 47-50 /t = -00185-197 in.; lat. 26-27 fi = -001- 

 •00106 in. ; lat. isthmi 17-19 /^ -00067-75 in. 



I cannot find any published dimensions of this rare species, 

 which I give as above, and I think that the siDecimens may safely 

 be hereto referred. Fig. 4. 



5. C. gemmatum nov. sp. Of medium size, subquadrate; 

 upper angles gently rounded, the lower ones rather more acute; 

 smooth, except at margins, which are provided with 3 concentric 

 series of large gemmules, the 2 inner series 12 and the marginal 

 one 14 in number. Sinus linear, rapidly expanding outwards. 

 Minnesota, U.S.A. 



Long. 47-5 fi ^ -00187 in.; lat. 39 /i = -00154 in.; lat. 

 isthmi \b fi= -00059 in. Fig. 5. 



6. C. rostratum nov. sp. Small, rather broader than long 

 (excl. spin.), upper margin rounded, slightly truncate at apex, and 

 ornate with four small triangular spines ; lower margins prolonged 

 into convergent rostra, which meet, or nearly so. Cytioderm 

 smooth. Sinus open, quadrangular in appearance, with blunt 

 angles. Isthmus wide. Minnesota, U.S.A. 



Long. (excl. spin.), 29 /Lt = -00114 in.; lat. max. 34 yu, = 

 -00134 in. ; lat. isthmi 20 ya = -00079 in. Fig. 6. 



EuASTKUM Ehr. {mut. char.). 



7. E. Floridanum nov. sp. Of medium size, diameter = about 

 half the length ; punctate, partly granular ; segments three-lobed, 

 with sinuate sides ; having but two principal frontal prominences, 

 which are well marked ; end protuberances not so strongly defined 

 except in side view ; end lobe tumid, the terminal incision a linear 

 notch ; sinus linear ; segments closely ad pressed. Numerous in the 

 gathering. Maitland, Florida. 



Long, m ^l= -00378 in. ; lat. max. 54 /^ = -00213 in.; lat. 

 isthmi 14 /i = -00055 in. Figs, la, h. 



This may possibly be a small form of E. crassum Breb., but 

 the difference in size and disposition of the prominences seems to 

 separate it clearly. 



8. E. pseudelegans nov. sp. General outline of frond in- 

 clining to oval shape ; ends protruding, rounded ; terminal incisions 

 large ; segments sinuate, with 5 central and 4 marginal markings 

 U.S.A. 



Long. 4lO /JL = -00157 in. ; lat. max. 25 5 fi = -001 in. ; lat. 

 isthmi 7 fM= ■ 00027 in. Fig. 8. 



9. E. coronatum nov. sp. Of medium size, about one-third 



3 r 2 



