182 DEPARTMENT OF THE XATAL SERVICE 



diameter and 6 micra long. Cell contents pale blue-green, very strongly granulated. 

 The trichomes tend to break into hormogonia at the small cells, and to escape frota 

 the sheath. 



On timbers of a wharf at half -tide mark on the Miramichi river at Chatham/ 

 N.B. (Fig. 1.) 



ToLYPOTHRix BREViCELLARis. Sp. nov. Froude penicillata, caerulea-viridi. Fili- 

 mentis 14-20 micra diam., repetite pseudoramosis, 1.4 mm. altis, Pseudoramis erec- 

 tibus. Trichomatibus 6-9 micra diam. Cellulis brevissimis, 2-4 micra longis. Hete- 

 rocystis ovalibus vel ovatis, et basilaribus, plurumque 15 x 12 micra, cum muris cras- 

 sissimis. Vaginis 4-7 micra crassis, firmis, hyalinis, lamellosis. (Fig. 2.) 



ToLYPOTHRix BREViCELLARis. New S'pecies. Plant mass penicillate. Pale blue- 

 green. Filaments 14-20 micra in diameter, repeatedly branched, 1-4 mm. long, strict. 

 Trichomes 6-9 micra in diameter. Cells very short, 2-4 micra long. Heterocysts basal, 

 oval or ovate, averaging 15 x 12 micra, with very thick walls. Sheaths 4-7 micra thick, 

 firm, hyaline, lamellose. (Fig. 2.) 



At " Prince " Station No. 96, in the Northwest Miramichi river, N.B., June 24, 

 1018. Found also at Station 98. 



The filaments of this species, from both stations, exhibited the peculiar condition 

 shown in Fig. 2 and D, hormogonia having apparently, while still enclosed in their 

 sheaths, become attached near the apex of many of the filaments. In some cases this 

 arrangement had the apeparance of the beginning of a false branch, but in no case was 

 a heterocyst present at the point of contact. 



Stigonema subsalsa. Sp. nov. I'ilamentis cae*;pitulis. Filamentis 15-22 micra 

 diam., usque ad 960 micra altis. Trichomatibus cum binis ordinibus cellualarum in 

 portione inferiore et cum singulari ordine in portione superiore. Cellulis in portione 

 superiore 8 micra diam., 4-6 micra longis. Oellulis in portione inferiore 6-10 micra 

 diam., 5-6 micra longis. Vaginis firmis, fuscis, hyalinis, non-lamellosis. Hetero- 

 cystis nullis. Contentu pallido-olivaeeo. Cellulis cum 2-3 granulis magnis. 



Cellulae primordiae sunt similes Gloeocapsae. Gradus Gloeocapsa. — Cellulis 

 globosis vel oblongis, 9-11 micra diam. cum, 5-7 micra sine, teg, crassis. Vaginis 

 hyalinis, minime lamellosis. Contentu pallido-olivaeeo, cum uno magno granolo. 

 (Fig. 3.) 



Stigonema subsalsa. New species. Filaments growing in small tufts. Fila- 

 ments 15-2*2 micra in diameter, up to 960 micra long. Trichomes consisting of two 

 rows of cells in the basal portion and of one row of cells in the apical portion. Cells 

 in basal portion 6-10 micra in diameter, 5-6 micra long. Ciells in apical portion 8 

 micra in diameter, 4-5 micra long. Sheaths firm, brownish, translucent, not lamellose. 

 Heterocysts absent. Cell-contents light olive-green. Cells with two or three large 

 granules. 



The young stages of this species are Gloeocapsa-like. Gloeocapsa stage. — Cells, 

 5-7 micra in diameter. Sheaths colourless, slightly lamellose, 2 micra thick. Cell- 

 contents olive-green, Avith one large granule. (Fig. 3.) 



On Scytosiphon lomentarius growing on a sunken log in Miramichi bay, N.B. 

 Salinity of water in this habitat ranging from 16 04 per mille to 22-77 per mille. 

 TeiBperature of water ranging from 3-94°C. to 17-31°C. Collected June 10, 1918. 



