53 



stinctly lobed; usually there are four on each side of these, reaching 

 dose lo the margin-these are smaller, and sometimes indistinct ; 

 there are usually about eighteen others four on the end lobe, fivo 

 on the upper side lobes, and two on each of the basai lobes, but 

 these numbers are liablc to vary; the margin of the end lobe and 

 upper side lobes resembles M. angui osa Hantzsch, while the mar- 

 gin of the basai lobes is nearer M. de n tic u lata Bréb.; the end 

 view, owing to the numerous prominences, is very ii-regular. Celi 

 very thin; membr. brownish. 210 « 180 « 29 /. 



Euaslrum Sendtiierianum Reinsch |3 latius n. v. p. i5. Apices 

 broader. Length 48, 2; breadth at base, 25, ó; at apex 19, 2 u. 



Staurasfrum Arnelli Boldt i^ inornatum n. v. p. 17. Granules 

 scattered. 



.s'. coniuhmi Arch. p. 18, T. Ili, f. 5. Small; length and breadth 

 equal; semi-cells ovai, diverging widely from the isthmus, which 

 is broad; sides with one simple or deeply cleft stout spine; end 

 with about six small emarginate spines, and two rows of similar 

 spines within the margin : end view triangular, with a stout spine 

 at each angle, and about four small emarginate spines on the mar- 

 gin of the straight sides, and one row of similar spines within the 

 margin. Dim. (without side sp.) 27 ^ 27 « 11 7.; length of sp. 9 [i. 

 Ist nicht mit S. corna tu m Wolle zu verwechseln ! 



>\ Farquharsonii n. s. p. 20, T. IV, f. 3. Medium-sized, about 

 as long as broad, almost circular, ends sligthly depressed ; constric- 

 tion deep, linear, outer opening small with basai angles acutely 

 rounded; end view triangular, sides slightly concave, angles very 

 broadly rounded; membr. punctate. 54,4 « 48 « 1 1 v,.; thickness , 



38,4 a. 



Kònnte wohl zu S. orbiculare Ralfs gerechnet werden ; cfr. 

 auch S e o r d a t u m Gay (S orbiculare f. p u n e t a t a Gutw. ^ ! 



S. horametnun n. s. p. 21, T. Ili, f. 2. Medium-sized, a little 

 longer than broad, «hour-glass» shaped, constriction opening re- 

 ctangularly, sides about straight, semicells widening upwards, angles 

 subacute, ends tlatly convex; angles with 3 to 4 rows of crowded, 

 short, simple, acute, stout spines; end view triangular, or quadrangular, 

 sides slightly concave, angules acutely rounded, very spiny, 2 to 3 

 rows of spines across the angles, and a circle of i5 spines around 

 the centre in the triangular form, and of 20 in the quadrangular. 

 Isthmus about half the thickness of the semicell. Membr. smooth. 

 Dim. 57-65 « 48-59 « 18-24 [x; thick 33-42 y.. 



