50 - MESSES. W. WEST AND G. S. WEST ON 



granulata, lobo polari oblongo-rectangulari, polls subprofunde et late emarginatis, 



lateribus convexis, granulis parvis prseditis. 

 Lat. 61 II ; crass. 27 a ; lat. lob. pol. 17 ai ; crass, lob. pol. 11-5 ^. 

 No. 36. 



The vertical view of this apparently new Euastrum was the only one seen; an 

 unsuccessful attempt was made to obtain the other views. 



42. Etjastrum sympageum, nov. sp. (PL VI. fig. 11.) E. mediocre, l|-plo longius 

 qnam latius, elliptico-oblongum, in medio profunde constrictum, sinu angusto- 

 lineari extreme ampliato ; semicellulse pyramido-ovat£e, trilobse, incisuris lateralibus 

 brevibus et angnstis ; lobis lateralibus leve concavis, angulis inferioribus truncato- 

 emarginatis, angulis supcrioribus interdum rotundatis ; lobo polari latissime pyra- 

 midato, utrobique triincato-emarginato, apice subretuso ; semicellulte lumore singulo 

 intra angulum unumquemque loborum lateralem et apicalem, uno infra polum et 

 papillis binis, 4 submedianis : a vertice visse ellipticsc, lateribus 4-undulatis (medianis 

 duabus majoribus), lobo polari elliptico lateribns 3-undulatis ; a latere visse ovatsB 

 lateribus biundulatis, apicibus rotundatis, angulis supcrioribus loborum lateralium 

 tricrenatis ; membrana irregulariter punctata. 

 Long. 56-58 n\ lat. bas. semicell. 32-33 /u; lat. lob. pol. 25-26*5 i*; lat. isthm. 8*5-9/*; 



crass. 19 '5 jj.. 

 Nos. and 1. 

 This bears a considerable resemblance to E. stibintegrum, Nordst. (Desm. Brasil. t. ii. 



fig. 8), but is proportionately longer and with comparatively parallel sides; it has a 



different polar lobe, the lateral lobes of the semicells are less concave and of different 



form, and the lateral and vertical views differ much. 



13. Euastrum ansatum, Halfs, Brit. Desm. p. 85, tab. xiv. fig. 2 ; Nag. Gattung. einzell. 

 Alg. p. 122, t. vii. D. fjg. 3. 

 Long. 80 fx ; lat. 11 ^x ; lat. apic. 19 /. ; lat. isthm. 12-5 ^u. (PI. IX. fig. 17.) 

 No. 0. 



Yar. PYXIDATUM, Delp. Specim. Desm. Subalp. p. 91, t. 6. figs. 32-31. Forma apice 

 latiore quam in forma typica. (PL IX. fig. 18.) 

 Long. 65 (.i; lat. 32 /i; lat. apic. 17 ^ ; lat. isthm. 10 ^ ; crass. 20 yu. 

 No. 0. 



44. Euastrum obesum, Josh. Burm. Desmid. p. 638, t. xxiii. figs. 19, 20. 



Var. subangulare, nov. var. (PL VI. fig. 15.) Var. apicibus subquadratis et latioribus ; 

 membrana glabr^. 

 Long. 77 /u ; lat. 41 /i ; lat. apic. 22 ^u ; lat. isthm. 12-5 n. 

 No. 0. 



