204 



The Scottish Naturalist. 



32. Prcemorsum, Breb. 



Tillyfour. 



33. Pseudonitidulum, Nordst. 



Correnie. 



34. Punctulatum, Breb. 



Correnie ; Whiteley Marsh ; Tonley. 



35. Pygmceum, Archer. 



Tough ; Little Don ; Whiteley Marsh ; Pond ; Haughton. 



36. Quadratum, Breb. 



Tonley ; Little Don. 



37. Regnesi, Reinsch. 



Correnie ; Little Don. 



38. Reni 'forme, Archer. 



Tonley. 



39. Shwdrumense, n. sp. 



Small, subquadrate, very slightly (about one-eighth part) longer than broad, 

 constriction deep, linear, opening widely ; sides and angles rounded, ends 

 very slightly rounded, almost flat ; sides with about three undulations, 

 ends with four or five slight undulations ; surface faintly granulated, a 

 slight central protuberance above the base with four perpendicular rows of 

 about four small granules in each ; side view of semi-cell globular, end 

 view oval, very slightly prominent at the sides : zygospore globular with 

 somewhat long, tapering, simple, acute spines. Length 26-29 ; breadth 

 23-27 ; isthmus 7-8 ; diameter of zygospore 23-26 ; do. including spines 

 42-48 in. 



Little Don, near Alford. 



This little species was originally gathered at Slewdrum in Birse, hence the 

 name ; the zygospore has been got there only. 



40. Sphcerosporum, Nordst. 



Whiteley Marsh ; Little Don. 



41. Subcrcnatum, Hantzsch. 



Inch ; Wh'teley Marsh ; Wellhouse. 



42. Tetraophthalmum (Kg.) Breb. 



Little Don ; Towie. 



43. Tinchun, Ralfs. 



Correnie ; Pond, Haughton ; Keig ; &c. 



44. Truncatellum, Perty. 



Correnie; Haughton. 



45. Undulatum, Corda. 



Little Don ; Tonley. 



46. Variolatum, Lundell. 



Tonley. 



