Nr. 1] SUBAÉRIAL ALGAE FROM SOUTH AFRICA 35 



1,5—1,8 /<, the length 18 — 21 //. This form I distinguisli as formå 

 siibtortuosa. 



The other oiie I distinguisli under the name of formå falciformis. 

 Il is distinguished by having always falciform cells. Besideis, they 

 are soniewhat more slender than the preceding one, 1,2 — 1,5 jn 

 broad, and 10 — 15 ja long. The cells are never so curved that the 

 ends converge, but they are often nearly parallel. 



Observed on a piece of wood, collected near the water-place at 

 Saldanha Bay, March 19tli. (No. 375). 



It is passible that these two forms, mentioned above, should 

 rather be separated as different species; but as long ais the tnie 

 nature of these organisms is not fully fcnown, I have preferred to 

 place them as done above. 



Myxosarcina uov. gen. 



Familils liberis ciibice rotnnchdis distincte definitis, densis, com- 

 pnctis, cellulas numerosas aequales, fere cubicas vel pohjedricas con- 

 tinentibus. Diuisionibus in tres dirediones familiae cellulariim 

 regnhiriter dispositariim oriuntur; postea subirregulariter dividi 

 possunt, unde familiae aetate magis provedae subirregnlares viden- 

 lur. Membranae leves, tenuissimae, hijalinae. Familiae tegumento 

 mucoso tenui, achroo saepe fere inconspicuo circumdatae. Propa- 

 gatio gonidiis in gonidangiis ceUulis ceteris paullo majoribus ortis. 



Myxosarcina concinna nov. spec. [PI. XVI, Fig. 342—357]. 



Familiis regulariter cubice rotundatis ex cellulis cubicis vel 

 pqlijedrids viilgo bi regulariter formatis. Membrana cellularum 

 tenuissima levi, hgalina, diametro 3 — A jti, raro usque ad 5 fi ante 

 divisionem; contentu cano violaceo. Familiis adultis cellularum 64 

 vulgo 16—20 i(, familiis aetate provedis cellularum plurium usque 

 ad o2 a diametro. Propagatio gonidiis parvis numerose in gonidan- 

 giis a ceUulis vegetativis et formå et magnitudine vix diversis ortis. 

 Cellulae omnes gonidias formare posse videntur. 



This genus is no doubt most closely related to Pleurocapsa; it 

 differs, however, by so important characters, that it forms a genus, 

 distinctly separate from Pleurocapsa. 



The genus of Myxosarcina is very characteristic in forming free- 

 living colonies, with a definite and distinctly limited circum- 

 ference; it is never crusty, as is common in Pleurocapsa. Furlher 

 it differs by having gonidangies of the same shape and size as the 

 ordinary vegetative cells. 



The colonies of Myxosarcina are conmionly very regularly built. 

 The original cell divides in all three directions, wherebv arise small 

 colonies, consisting of 8 oells. PI. XIV, fig. 342, 343.' By further 

 divisions of each of these 8 cells in three directions, arise 64-cell6d 

 (■oh)nies, which much recall the ^Sarcina-packages. As these oell- 



