beef 
. 
9% 
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TURNER: DESMID NOTES. 345 
Cosmarium gotlandicum Wittr. vy. cambrense n. var. 
Fairly similar to the type, except that it is proportionally 
much narrower. Long. 35, lat. 22, isth. 6. Near Dolbadarn, 
AL. 
Staurastrum lewisianum n. sp. This beautiful species 
is related to S. capitulum Bréb. and S. amenum Hilse. It 
differs from the former in being doubly sinuate at the sides, 
and from the latter in having two rows of verruce. In this 
form the lower verrucz are plain, the upper series being 
minutely dentate or serrate. In vertical view the sides are 
gently incaved, the apices (3-4) being rounded. Long. 
37-42; lat. 18-21, isth. 13-16. Near Llanberis, J. H. Lewis, 
to whom I dedicate it. 
Staurastrum westii n. sp. A very interesting form, 
Seemingly between S. grifithsianum Nag. and S. di- 
placanthum DeNot. Each angle possesses 3 or 4 spines 
at the upper margin, with 5 short, toothed, thick processes, 
arranged in quincunx. Long. c. sp. 28-32, Ss. sp. 25-28; lat. 
C. sp. 23-26, s. s.p. 18-21; isth. 8-10 w. This little plant 
I dedicate to my friend Mr. W. West, F.L.S. Llyn Padarn, 
fs Fe 
Staurastrum diplacanthum vy. anglicum n. v. This var. 
differs from the Italian type of De Notaris (which I have 
from Strensall) in having the apices more convex, and 
crowned with little verruce; it has a number of aculei 
wanting in the type. Long. c. sp. 37-41, S. sp. 27-32; lat. 
C. Sp. 34, Ss. Sp. 28; isth. 9-11. Trelleck, comm. J.H.L. 
: -eboracense n. sp. Small, with 4 Ce 
arms, couaded at the ends; each arm with 3 or 4 rows of 
conical granules ; sides sinuate ; ; sinus rounded. It has an oe 
apical: corona of little verruce ; remainder, except arms, 
smooth, Lon ig 25, et. 27; dat. isth. 7 fl “Nearest to ae 
S. ——— Lund. Strensall —— ney. 
kense n. sp. ‘Small, semi-cells en 
strum trellec 
peace with a few rows of short stout aculei, each spine very _ 
_ dilate at base; angles rounded, each with 6 or 7 short plain 
 aculei. Sinus narrow. Long. c. sp. 33, S- SP. 305 Le 
- 3a, ssp. 28: isth. ledge pe maa comm. J.H.L. Le 
Micrasterias papi 2 
