186 Mr. Hassall's Notices of British Freshwater Alga. 



The species of this genus, while they agree with Staurocarpus 

 in the arrangement of the endoehrome, yet differ very considerably 

 from it in the form of the sporangium, and it is on this difference 

 that I have ventm-ed to found a new genus. From those species 

 of Tyndaridea whose sporangia are hkewisc formed in the connect- 

 ing tubes, the genus Spharocarpus is distinguished by the dissi- 

 milar disposition of the endochrome. 



Sph. scalaris. For description see 'Annals and Magazine of 

 Nat. Hist.' vol. x. ; and for figure, PI. VII. fig. 7. 



Hab. Vicinity of Cheshunt and various other places, A. H. ; 

 near the Blackboys Tm-npike-gate, jMr. Jenner. 



I have recently received from Mr. Jenner what I regard as a 

 variety of Sph. scalaris. The filaments are of the same diameter, 

 but the sporangia instead of being oval ai-e spherical. This may 

 be distinct. See fig. 8. 



Hab. Croboro' Warren, Mr. Jenner. 

 Sph. intricatus. Filaments of less size than those of Sph. scalaris; 



cells five or six times as long as broad ; sporangia oval, rather 



larger than those of Sph. scalaris, theii' long diameters being 



placed in the cUrection of the \a(\.th. of the cells. Fig. 9. 



Hab. Broadwater Forest, Mr. Jenner. 



The only differences to be detected between this Spharocarpus 

 and Sp)h, scalaris are the smaller diameter of the filaments and 

 larger size of the sporangia, but these are I think of a sufficiently 

 well-marked character to justify its being ranked as a distinct 

 species. This species has only as yet been found by that indefa- 

 tigable obsener Mr. Jenner. 



Sjjh. recwi^us. Filaments of smaller size than those of Sph. in- 

 tricatus ; cells six or seven times as long as broad ; sporangia 



cu'cular. Fig. 10. 



Hab. Penzance, Mr. Ralfs ; Rackham Common, Mr. Jenner. 



This species I fii'st received from Mr. llalfs, and some two or 

 three weeks afterwards it was sent me by Mr. Jenner. I regard 

 it however as the species figm-ed by DUlwyn (Supplement, pi. C.) 

 as M. genuflexa in a state of reproduction. 



Sph. depressus. Filaments rather larger than those of Sph. re- 

 curvus ; cells six or seven times as long as broad ; sporangia oval, 

 small, then" long diameter being placed in the direction of the 

 length of the ceUs. See fig. 11. 



Hab. Rackham Bogs, INIr. Jenner ; Penzance, jNIr. Ralfs. 

 There can be no doubt of the distinctness of this species, which 



was procm-ed by Mr. Jenner some weeks before it was found and 



transmitted to me by Mr. Ralfs. 



Sph. nummuloides. Filaments of rather larger size than those of 



