172 Transactions of the Royal Microscopical Society. 
linearis, Janisch et Rabenliorst in Rabenh. ‘ Beitr.,’ I., tab. ii., fig. 2 
(1863). Stictoclesmis australis (Ire vi lie in ‘Edinburgh New 
Phil. Journ.,’ vol. xviii., No. 5, pi. i., figs. 1-4 (1863). Rare in 
the Honduras gathering, Adriatic and Red Sea, New Caledonia, 
&c. Clinmconeis seems to be rather an abnormal or craticular 
state of Navicula scopulorum Bieb. ( Pinnularia Johnsonii Wm, 
Sm.) than a distinct genus. The valves of both of them are 
characterized by their very small oblong central nodules, and the 
striae radiating round the terminal nodules, which are somewhat 
removed from the apices. The striae are distinctly moniliform and 
more or less parallel until they approach the central nodule, when 
they become radiant (18-20 in •01 mm.). This craticular state 
of N. scopulorum seems to occur only in the warmer seas. I have 
not yet seen it from the northern seas, and rarely from the 
Adriatic, where it is mixed now and then with unaltered N. 
scopidorum. J may here mention Surirella craticula Ehr., to 
which I had previously given the name of Craticula Elirenbergii, 
but which is only an abnormal state of Navicula cuspidata 
[G. Norman, of Hull, also considered it to be a state of N. 
cuspidata, but it seems to me to more nearly resemble N. anibigua. 
— F. Iv.]. C. Perrotettii Gran, must be named Navicida Perrotettii, 
a species found not only in the Senegal river but also in Bengal 
and Italy. 
[ Professor H. L. Smith, ‘ Lens,’ vol. i. p. 77, retains the genus 
Stictodesmis to which he relegates Surirella craticula. If either 
of the two genera is to be retained it must be Climaconeis, as 
Grunow’s genus has the priority of publication. — F. K.] 
Grammatophora. 
Grammatophora anguina Kiitz. var. delicatula Grun., minor 
et angustior, striis 17-18 in '01 mm. Common in the Honduras 
gathering. 
G. oceanica Ehr. var. intermedia Grun. Striis 21-22 in 
• 01 mm. Common. Between G. marina and G. subtilissima there 
seems to be an uninterrupted series of forms, the striation of 
which becomes gradually finer. 
Plagiodiscus, Grunow et Eulenstein. 
Genus novum, Surirellis affine, frustrulis cuneatis valvis reni- 
formibus, costis radiantibus. 
P. Martensianus Grun. et Eulenst. Area media lrnvi lincari 
oblonga, leviter curvata. Tab. CXCIV., Fig. 8. 
Rare, Mauritius, Ambeyna, Yiti Islands, Seychelles. 
P. nervatus Grun. Linea media angusta, curvata, area 1m vi 
nulla. Tab. CXCIV., Fig. 9, a, b. 
