UV G. I. PLAYFAIH. 173 



same water and agree remarkably in size and markings. The 

 four scrobiculae are arranged three in an equilateral triangle 

 round the fourth. By careful focussing, the tops of the central 

 basal and two upper tumours appear as scrobiculae also; and it 

 will then be seen that the seven are arranged quincuncially — 

 six at equal distances in a circle round the seventh. It is a 

 characteristic feature of this form. 



Eu. SUBIMCISUM Reinsch, Desm. Cape of Good Hope, f. 12. 

 (T.iv. f.l) 

 Long. 29; lat. 23y^. 

 Murray's Lagoon, Collector. 

 Reinsch gives long. 22|, lat. 18/x. 



Eu. DEMINUTUM, n.sp. (T iii. f.8). 



Eu. magnum, elongatum, medio sinu lineari constrictum, 4 plo. 

 longius quam latum. Semicellulae suboblongae, utroque latere 

 excavatae; angulis inferioribus rectis; lateribuse basi verticalibus 

 tum repente convergentibus et in colliim longum, angustum 

 adscendentibus; lobo polari valde inflato, latitudine latitu- 

 dinem basis fere aequante, lateribus rotundatis, apice latissime 

 rotundato, incisura lineari extremo verrucis binis instructa. 

 Semicellulae supra basin tumoribus binis et inter eos scrobiculis 

 singulis praeditae; a latere visae oblongae, basi inflatae, lateribus 

 fere rectis et parallelis, apicibus rotundato-truncatis; a vertice 

 visae subcirculares, regulariter 6 undulatae. Membrana crassa 

 precipue supra basin, grosse scrobiculato-punctata praecipue in 

 lobo polari. 



Long. 135-140; lat. 40; lat. lob. pol. 34-36; lat. coll. 22; crass. 

 33-34^. 

 Botany. 



A Eu. Longicolli proximo difFert basi angustiore, lobo polaii 

 magis inflato, tumoribus paucioribus, et conspectu a vertice visum. 

 See note on Eu.*jlongicolle, supra. 



