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



The species of this genus, while they agree with Staurocarpus 

 in the arrangement of the endochrome, yet diiFer very considerably 

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

 that I have ventured to found a new genus. From those species 

 of Tyndaridea whose sporangia are hkewise formed in the connect- 

 ing tubes, the genus Sphoft^ocarpus 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, PL VII. fig. 7. 



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

 near the Blackboys Turnpike-gate, Mr. 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 are 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, their long diameters being 

 placed in the direction of the width of the cells. Fig. 9. 

 Hab. Broadwater Forest, Mr. Jenner. 



The only differences to be detected between this Spharocarpus 

 and Sph. 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 observer Mr. Jenner. 



Sph. recurvus. Filaments of smaller size than those of Sph. in- 

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

 circular. Fig. 10. 



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

 This species I first received from Mr. Ealfs, and some two or 



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



it however as the species figured by Dillwyn (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, their long diameter being placed in the direction of the 

 length of the cells. See fig. 11. 



Hab. RackhamBogs, Mr. Jenner; Penzance, Mr. Ralfs. 

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



was procured 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 



