MR. W. JOSHUA ON BURMESE DESMIDIE.E. 647 



with an inner row of blunt protuberances 7-13, much enlarged 

 at base of polar end ; end truncate, fringed at margin with 

 strong conical projections 4-5 in each side, none on the back ; 

 cells considerably inflated, appearing spherical in side view. 

 This species has some resemblance, especially fig. 4 c and 4 d, 

 with C. vosgesiacum, Lemaire ; it stands also near C. JReinschii, 

 Arch. Length 35 fi ; breadth 25 /* ; width of isthmus 8| /i. 



C. punctulatum, Breb. 



C. cuneatum, n. sp. (Plate XXIV. figs. 17 & 18.) 



G. mediocre, constriction© profunda : cellulis ovato-cuneatis, 

 fere tam longis quam latis ; semicellulis acute cuneatis, dorso 

 nudo, centro granulis 4 utroque latere dorsi, nee ad apices pro- 

 vectis, marginibus extremis granulis 14-17 majoribus, rotundatis, 

 seriatim dispositis ornatis ; angulis lateralibus a latere conspectis, 

 semiacutis : isthmo latitudine circa | partem diametris transversi. 

 Longit. 46 /u, latit. 46 /z : isthmi latit. 11 /u. 



Medium size; cell ovato-cuneate, about as broad as long; 

 semicells sharply cuneate, with broad back, furnished at ex- 

 treme edge with a series of 14-17 large circular granules, 

 diminishing in size on each side as they approach the linear 

 median line, and in many specimens showing a double row of 

 granules above the centre; there is also a central series of 

 granules, 4 on each side of back, not carried to the apex ; seen in 

 side view, lateral angles semiacute ; constriction deep. It stands 

 nearest to C. monomazum, Nordst. Breadth=length 46 ft ; breadth 

 of isthmus 11 /i. 



C. spinosum, n. sp. (Plate XXV. figs. 3 & 4.) 



G. mediocre, paulo longius quam latum, semiellipsoideum ; 

 membrano interiore minute et regulariter punctato, serie unica 

 aut duplici punctorum majorum nonnihil procul a constrictione 

 addita ; semicellulis seriem spinarum circa 6 utroque latere (non 

 ad apicem provectarum) ferentibus : cellulis a latere conspectis 

 globosis: isthmo latitudine fere | diametri transversi: ang^ulo 

 sinu lato apud punctum junctionis. Longit. 51 //, latit. (sine 

 spinis) 40/x. 



Medium size; rather longer than broad, semielliptical ; inner 

 membrane minutely and regularly punctate, with a single or 

 double row of rather larger punctations, encircling at some 

 distance the constriction ; furnished with a row of spines about 

 6 on each side of semicell, which are not extended to apex ; seen 

 in side view, they form two divergent rays, approaching nearer at 



