62 MESSES. W. WEST AND G. S. WEST ON 



siibconcavis, apicibus tnmcatis vel levissime convexis ; gramilis magnis in seriebus 

 concentricis marginem versus, minoribus et irregulariter medium versus ordinatis, 

 infra centrum seriebus 8-4 granulis majoribus (6-8 in serie unaquaque) cum 

 hexagono scrobiculorum parvorum circa granulum majorem unumquemque; a 

 vertice visse rhomboideo-ellipticae, granulis subconcentrice ordinatis, in centro 

 granulis sparsissimis irregulariter dispersis, ad medium utrobique granulis 6-8 

 multo majoribus ; membrana inter granules irregulariter punctata. 

 Long. 142-161 f*; lat. 111-119 |u ; lat. istlim. 32-38 /^ ; lat. apic. circ. 43-45^; crass. 

 72«.. 

 No. 0. 



Tliis is one of the largest and most beautiful species yet described, the only one at all 

 approaching it being Cosmarium magnificmn^ Nordst. (Preshw. Alg. of New Zeal. & 

 Austr. p. 62, tab. 6. fig. 19), from which it is quite distinct. 



The hexagons of scrobiculations round the larger central warts were arranged in such 

 a manner that two opposite angles were always on a vertical line. This was the case in 

 all the specimens examined, and the hexagons appeared to gradually fade off amongst the 

 granules outside them, the latter being irregular and finally becoming larger and concen- 

 trically disposed. 



87. Cosmarium Anax, nov. sp. (PL VII. fig. 7.) C, permagnum, pauUo longius quam 

 latum, profunde constrictum, sinu lineari extrorsum ampliato; semicellulsc late pyra- 

 midatse, angulis inferior ibus latissime rotundatis, lateribus subconcavis, angulis supe- 

 rioribus rotundatis, apicibus anguste truncatis subrectis vel levissime concavis et in 

 medio incrassatis ; membrana scrobiculata et minutissime punctata inter scrobiculos, 

 in centro sine scrobiculis, sed minutissime punctata ; a vertice visse ellipticse, polls 

 porrectis et late rotundatis. 

 Long. 173^ ; lat. 153 /a ; lat. apic. 42 ^i; lat. isthm. 52^1; crass. 86 /i. 

 No. 0. 



This is also one of the largest and most characteristic species of the genus. A portion 

 of the membrane is figured under a higher magnification to show the scrobiculations 

 with the intervening punctulations (fig, 7, <?). 



88. Cosmarium Pseudobroomei, Wolle, Desm. U.S. of America, p. 86, pi. 51. figs. 36, 37 ; 

 Turner, Preshw. Alg. of E. India, p. 66, tab. ix. fig. 41. 



Yar. madagascaiiie:nse, nov. var. (PI. A^II. fig. 34.) Var. major, semicellularum late- 

 ribus subdivergentibus vel paraUelis ; granulis ad medium multo minoribus. 

 Long. 49-51/11; lat. 44-49 /u; lat. isthm. 12-5-16-5^; crass. 25 /«. 

 No. 3. 



Yar. ELEGANS, nov. var. (PI. YI. fig. 25.) Yar. ceUulis granulis paucioribus majori- 

 busque ; a vertice visis crassioribus. 

 Long. 42 ^\. ; lat. 33-5 ^ ; lat. isthm. 11'5 /» ; crass. 20 /«. 

 No. 0. 



