14 THE GENUS TRACHELOMONAS, 



Var. ovALis, n.var. (PI. i., f.36). 



Lorica var. latioris dimensionibus sed ovalis, polos versus 

 magis acuminata, lateribus magis arcuatis, apicibus rotundatis; 

 collo nullo; membrana dilute fulva interdum punctata. 



Long. 22-23, lat. 13-15; lat. oris 4 /x. 



Botany 151; Lismore 245. 



Oval-elliptic, instead of linear-elliptic, with sides converging 

 from the centre to the ends. 



Var. MINOR, n.var. (PI. i., f.37, 38). 



Lorica minor, cetera ut in formis duabus precedentibus. 



Long. 12-19, lat. 8-12 /x. 



Botany 151, 152; Lismore 240, 242. 



Includes both the preceding forms in smaller sizes. 

 Var. LiSMORENSis, n.var. (PI. i , f.39, 40). 



Lorica collo quadrato valido instructa. 



Long. 25-26, lat. 10-11; coll. alt. 21-3, lat. 3-4 /x. 



Lismore236, 237, 241. 



Var. GRANULOSA, n.var. (PI. i., f.41). 



Lorica minute granulata; collo humillimo. 



Long 25-28, lat. 11-14; coll. alt. 1, lat. 4 /x. 



Botany 142. 



Track. pulchejTima is a close connection of IVach. cylindrica, 

 from which it differs in the gently arched, not parallel, sides. It 

 is also much more variable than that species. 



Trachelomonas Volzii var. pellucida, n.var. (PL ii., f.l). 



Lorica ut in forma typica, levis autem et pellucida, nee punc- 

 tata nee granulata; candore carnoso psene hyalino. 



Long. 34, lat. 1 8 /x. 



Botany 142; rarissime. 



Lemmermann gives 32 x 15/x, Dr. Volz gessam. siissw. Alg., 

 p.l66, T. xi., f.9. Track. Volzii is ovate, broader behind than 

 before, neck with pointed sides in optical section, The type is 

 described as granulate (the figure, however, has a smooth outline) 

 and yellow-brown in colour. Var. pellucida is pale bufT, almost 

 colourless, and neither punctate nor granulate. Only one speci- 

 men noted. It is a young form of var. australis, infra, with 



