296 MESSRS. W. WEST AND G. S. WEST ON 
Specimen of ‘ pseudofurcata’ form in H. J. no. 573 (lat. 
185 y). 
* Found several curious specimens having the lateral rays 
recurved strongly, and in one case with the apices blunt." (Fig. 
xylogr. 2 a.) 
Seattle, Wash. Mostly typical and rather small (lat. 120 y). 
60. MrcnasTERIAS RINGENS, Bail. 1851; Wolle, Desm. U.S. 
p. 112, t. 35. ff. 1, 2. 
Var. SERRATULA, Wolle, 1885; Alg. U.S. p. 41, t. 59. f. 15. 
The specimens are referred to AM. ringens with some doubt. 
In the two specimens observed the margins were serrate as in 
M. mahabuleshwarensis, and the apices of the lobes possessed 
three teeth ; also they had each a basal granulate protuberance 
to the semicells. One specimen (long. 145 p; lat. 116 p; lat. 
isthm. 21 u) possessed a series of granules within the serrate 
margin, whereas the other (Laconia, N.H., H. J. nos. 650 and 
679; long. 156 u; lat. 152 u) was quite smooth. These forms 
appear to differ from many specimens of M. mahabuleshwarensis 
that we have seen only in the absence of the additional apical 
process. 
61. M. AMERICANA, Ralfs, Brit. Desm. p. xix et 74, t. 10. 
f. 1 a-c (1848).— Euastrum americanum, Ehrenb. 1843. 
Var. Lewrstana, West, in Journ. Roy. Micr. Soc. 1890, p. 286, 
t. 5. f. 13. 
Long. 80-103 y; lat. 70-84 u; lat. isthm. 23-26 p. 
Hab. Ithaca, N.Y. (H. J. nos. 491 & 493). 
62. M. Tonnzxr, Bail. in Ralfs, Brit. Desm. p. 210, t.35.f 5; 
Wolle, Desm. U.S. p. 108, t. 30. ff. 1-8. 
Hab. De Land, Florida (H. J. ncs. 604 & 617). 
63. M. spectosa, Wolle, 1885; Alg. U. S. p. 38, t. 56. ff. 1,2; 
West &§ G. S. West in Trans. Linn. Soc. Ser. Yl. (Bot.) Y 
p. 240. 
Long. 104; lat. 96 p. 
Hab. De Land, Florida (H. J. no. 561). 
64. M. rETRAPTERA, n. sp. (Pl. 16. fig. 6.) 
M. submediocris, paullo longior quam lata, elliptica, | 
late truncatis, profundissime constricta, sinu lineari ; semicello » 
quinquelobæ, incisuris subampliatis ; lobo polari subinfundibu i- 
formi, ejus angulis lateraliter productis et decurvatis, apice CO? 
apicibus 
