34 W. B. TURNER, FRE.SII-WATER ALGM OF EAST INDIA. 



the suture projecting; it differs from D. spinosum (Wolle 1. c. t. X, f. 12) in the 

 clavate semi cells. 



Baileys D. hirsutum (Micr. Obs. p. 36, t. I, f. 8, 1850) is truly, as Wolle 

 suspects, a Gonatozygon, and the dimensions give, long. 149, lat. 11.5 — 12," (speeimen 

 dividing!): Baieeys remark, »segments many times larger than broad», conflicts with 

 his figure, the »segments» of which are only 6 — 7 times longer than the breadth! 

 YYliat the form is which Mr. Roy discovered on Deeside, Scotland, is not vet known, 

 as Archer (Proc. Dubl. Micr. Club, Q. J. M. Sci., 1*79, p. 438) did not give any 

 details of its form; it is to be hoped that Mr. Roy will figure it in the fortlicoming 

 'Scottish Dcsmidiege'. Archer, 1. c, stated that the plant was not hirsute, but bore 

 elongated papillce ! 



34. D. crispulum, n. sp. I), minus, vix attenuatum, 14 — 1 6-plo longius quam latum, rectum, 

 saepe paullo curvatum, margine regulariter undulatum (nndis 11 — 13 ferens), basi 

 paullulum inflatum; apicibus truncatis, 7 — 8 crenatis; membrana glabra. Sutura? 



Long. 290—320, lat, 21—22, lat. apic. 17 ,«. 

 T. IV, f. 14. 



35. D. salebrosum, n. sp. I), medium, circ. 1 6-plo longius quam latius, rectum, margine 

 irregulariter rugatum (superticies rugosa?); semicellula> in basalem partem 3 — 4 in- 

 flationes ferentes; basi valde infläta; semic. vix attenuatis; apicibus rotundato-truncatis, 

 6 8 crenatis (a fronte visis); membrana sub-crassa, glabra. 



Long. 450, lat, bas. 30, lat. centr. semic. 28, lat. apic. 23 ,u. 

 T. II, f. 12. 



36. D. egregiuni, n. sp. D. minus, egregium, peculiare, circ. 12 — 15-plo longius quam 

 latum, rectum, e basi attenuatum; annulis hevibus pleno, reliqua parte frondis (circa 

 annulos) punctata; annulis aut in lineas obliquas, aut irregulariter, aut spiraliter, positis; 

 margine irregulari; sutura prosiliente; apicibus truncatis, dentibus 6 (4 a frontt' visis) 

 munitis; basi modice infläta. 



Long. 240—310, hit. bas. 22—24, lat. centr. semic. 19, lat, apic. 15 ,u. 



T. II, f. 14, 15. 



Nearest to D. verrucosurn, Bailey (Spec. Amer. Desm., Am. J. Sci., p. 127, f. 4, 

 1846), from which it differs in the markings being annular, not rectangular, and in 

 their disposition — those of Bailey's sp. being placed in rings round the cell. Near 

 also to Arthrorhabdium Moluccense Ehrb. (Abhl. Akad. Berol. p. 46, t. II, f. III, 13 a b, 

 1869; and to Doc. tesselatum, Josh. (Bnrm. Desm. p. 651, t. 25, f. 15); both of which 

 are apparently forms of Baieey's D. verruoesum. ('fr LageRHEIM in Krit. Bemerk. zii 

 Desm. p. 541, 1SS7. I am indebted to Dr. Nordstedt for copy of Baileys little 

 memoir and fignres. 



37. D. (»Mlemalmn, n. sp. D. parvum, notabile, fila formans; circ. 8 — 10-plo longius quam 

 latius; vix attenuatum (excepte apices); membrana laeve vel subtilissime punctata, 

 apice striata; semicellulis profunde 3 — 5 constrictis, versus apicem constrictis externe 

 dilatatis; apicibus truncatis; sutura non prosiliente? 



Long. 130 — 155, lat. semicell. 14 — 15, lat. apic. 13 — 14 ,//. 

 T. II, f. 7. 



