292 
Transactions of the Society, 
A. comer gens Ehrb. 
A. tenuissimus Arch. 
C., A. 
C. 
As this is a rare species, a figure is given. Fig. 10. 
Genus Staurastrum Meyen. 
S. dejectum Breb. var. lunatum Balls. P., A. 
S. mucronatuin Kalfs. C. 
S. connatum (Lund.) Eoy & Biss. C. 
S. apicidatum Breb. C., A., P. 
S. Bichiffd Kalfs. C., P. 
S, hrevispinum Breb. G. 
S. cuspidatum Breb. D., F. 
*S. pseudocuspidatum Eoy & Biss. C. 
S. O'Mearii Arch. S., C., F. 
*S. hacillare Breb. ^ ohesum Lund. C. 
Long. 17-18 fx. Fig. 4. 
S. oligoeanthum Breb. C. 
*S. denticulatum (Nag.) Arch. F. Fig. 27. 
S, avicula Breb. F. 
var. aciculiferum W. West. F. 
8. furcatum Ebrb. C., F., P. 
A faintly punctate variety of this species is figured, having the 
lateral bifid processes almost reduced to two spines, the other “ bifid 
processes” being sharply bispinate. Fig. 11. 
var. armigerum Breb. R, Do. 
S. pseudofurcigerum Keinscb. P. 
8. Reinschii Eoy. F., C. 
8. Brebissonii Arch. C. 
8. pilosum Nag. Do., B., C., F., P. 
8. teliferuni Ealfs. P., Do. 
^8. gladiosum Turn. C. 
S. SPINIFERUM nov. sp. Fig. 20. 
S; parvum, semicellulis ellipticis cum octo spinis (circa) ad 
marginem semicellulae singulae, a vertice triangulare cum spinis 
novem, lateribus leviter concavis. 
Long. 25 [X ; lat. 22 [x ; lat. istb. 7 • 5 /x. 
Segments elliptic, with about eight spines in the periphery 
of each segment, end view triangular, sides very slightly 
concave, showing two spines between each apical one. F. 
8. hystrix Ealfs. 0. 
S. cuMBRicuM nov. sp. Figs. 5 and 36. 
S. magnum, tertiam partem longius quam latum, semi- 
cellulis late ellipticis, a vertice triangulare; lateribus leviter 
convexis cum spinis velatis sed paucis ad sinum, multis 
longioribus ad angulos. 
