420 ORDER FLA GELLA TA-EUSTOMA TA. 



leap briskly to one side. The Cry^toglena ctzruleus of the same authority is evidently 

 an illoricate type not referable to the present generic group, and whose true relation- 

 ship is as yet doubtful. The form figured by both Ehrenberg and Stein under the 

 name of Cryp >glma pigra is here made the type of the new genus Ch/oromonas. 



Cryptoglena angulosa, Carter. Pl. XXI. Figs. 43-45- 



Lorica oblong, angular, and compressed, truncate, but with a short pro- 

 jecting neck on the anterior margin, the posterior border rounded ; in 

 lateral view the anterior and posterior borders curved in opposite directions 

 and exhibiting a sigmoid outline ; body of enclosed animalcule occupying 

 the greater portion of the lorica, but leaving free a conspicuous peripheral 

 border ; flagella equal in size ; two contractile vesicles situated close to 

 each other at the anterior extremity ; a red eye-like pigment -spot located 

 on one side of the periphery ; from one to four amylaceous corpuscles 

 usually developed towards the posterior extremity. Length of lorica 

 1-1080". Hab. — Fresh-water lakes in the island of Bombay. 



The encysted state of this species was observed by Mr. Carter,* as also its sub- 

 division under such conditions into two and four sporular bodies, these latter being 

 ultimately liberated, by the dehiscence of the old lorica, which becomes smooth and 

 dilated, as zooids of smaller size, but corresponding in all other respects with the 

 parent form. The movements of this animalcule are described by its discoverer as 

 being directed forwards, but in an exceedingly irregular line. 



Genus V. STERROMONAS, S. K. 



(Greek, sterros, stiff; motias.) 



Animalcules free-swimming, elongate, more or less persistent in form 

 bearing two flagella of diverse size at the anterior extremity, the longer 

 of which is extended arcuately and stiffly in advance, while the shorter 

 one is actively vibratile and flexible throughout ; oral aperture indistinct ; 

 endoplasm transparent, granular ; no eye-like pigment-specks ; contractile 

 vesicle and endoplast conspicuously developed. 



Sterromonas formicina, S. K. Pl. XXIV. Figs. 40-42, 



Body elongate, gibbous, nearly three times as long as broad, inflated 

 and widest posteriorly, narrower in the centre, slightly widening again 

 anteriorly, both the anterior and posterior margins obliquely truncate or 

 angular as seen in profile ; flagella inserted close to one another near the 

 centre of the frontal border, the longer one equalling the body in length, 

 directed stiffly in advance, arcuate at its distal termination, the shorter one 

 less than half the length of the other, flexible and tremulous throughout ; 

 endoplasm transparent, enclosing numerous granules of irregular form 

 and size ; endoplast spherical, subcentral ; contractile vesicle posteriorly 

 located. Length of body 1-2000" to 1-1250". 



Hab, — Vegetable infusions in salt and fresh water. 



* ' Annals and Magazine of Natural History,' 1859. 



