ZOOLOGICAL AND BOTANICAL ASSOCIATION. 115 



Length of joint varying from *&* to A of an inch (averaging about 

 t4tj in.) ; diameter of joint rota in. 



It affords me much gratification to have it in my power to connect 

 the name of my friend Dr. Kinahan with this species, while I feel it a 

 privilege to be permitted to employ this slight tribute of regard, and 

 very unworthy recognition, on my part, of many marks of consideration. 



2. — Leptocystinema asperum = Locidium asperum (Brth.). 



Filaments fragile; joints " slender, cylindrical, rough with minute 

 scattered granules ;" " ends dilated ;" endochrome disposed in an irregu- 

 larly narrowed, somewhat undulatory, or sub-spiral manner, sometimes 

 bifid at the extremities, (or " scattered" ?), and having immersed in it a 

 single median series of globular corpuscles, and usually with a pale space 

 at the centre. 



Length of joint, ^r to *"* of an inch ; breadth, ?&* ; breadth at end, 

 rsVr. (These are the measurements given by Ralfs, "British Desmidi®," 

 p. 159, with which my own have agreed very closely.) 



3. — Leptocystiriema Portii (nov. sp.). 



Filaments very fragile ; joints very slender, fusiform, very gradually 

 tapering to the ends, where they become dilated, giving to the apex a 

 sub-capitate appearance, rough with minute scattered granules ; endo- 

 chrome disposed in an irregularly contracted manner, having immersed 

 in it a single median series of globular corpuscles, and usually with a 

 pale space at the centre. 



Length of joint varying from *hs to -rta inch; diameter at the middle 

 of the joint, *-&tj; just under the dilated extremity, Wars; and of the ex- 

 tremity itself, jtots in. 



Although the compliment may be but an unpretending one, it affords 

 me great pleasure to have the opportunity of associating the name of my 

 friend, George Porte, Esq., with this species, — a gentleman whose mani- 

 pulative skill in its use is only equalled by his admiration of the many 

 beautiful objects brought to view by the microscope, — while it will be 

 commemorative, too, of the origination and initiation by him of a series 

 of pleasant re-unions, at once scientific and social, on the part of a limited 

 little circle, in the number of whom it is my own esteemed privilege to 

 be counted a unit. 



