124 



THE AMEEICAN MONTHLY 



[Jnlj, 



rowed anteriorly, the border truncate, 

 the posterior two-thirds rapidly taper- 

 ing to a pedicel, two to three times 

 its height ; enclosed animalcule sub- 

 spherical, filling the anterior part 

 of the lorica and projecting beyond 

 the anterior border ; contractile vesicle 

 double, the two placed side by side 

 near the centre of one lateral border ; 

 nucleus subcenti'al. Length of lorica, 

 -g-gJ^^ inch ; of enclosed zooid, y-g^o¥ 

 inch. Habitat. — On Utricularia 

 from the New Jersey pine barrens. 

 Solitary or scattered. Reproduction 

 by transverse fission. 



This minute form seems as bold as 

 the preceding is timid, sitting at the 

 aperture of the lorica and exposing a 

 considerable part of the body almost 

 continuously, the contractile ligament 

 rarely drawing it to the rear of the 

 sheath. It is also noteworthy in re- 

 spect to the position of the contractile 

 vesicles, these being usually poste- 

 riorly located, often postero-terminal. 

 Reproduction is accomplished quite 

 rapidly, the body elongating and 

 dividing transversely, having pre- 

 viously extended one, probably two, 

 additional flagella. The newly-formed 

 long flagellum is very apparent, the 

 smaller being so excessively minute 

 that its existence could not be posi- 

 tively determined. 



The lorica is very delicate. It will 

 not even for a short tiine resist the 

 action of a solution of caustic potassa, 

 which was applied for the destruction 

 of the enclosed zooid so that the ex- 

 act form of the sheath could be seen, 

 but which dissolved the lorica almost 

 as soon as the softer body within. 

 This is somewhat unusual, the loricag 

 commonly ^vithstanding even pro- 

 longed exposure to the caustic solution. 



Mallomonas litomesum, sp. nov. 



(Fig. 4-) 



Body elongate-ovate, three times as 

 long as broad, widest centrally, the 

 anterior extremity narrowest, the cu- 

 ticular surface finely crenulate ; the 

 non-vibratile setose hairs confined to 

 the two extremities, the central part 

 of the cuticular surface entirely naked, 



those of the posterior extremity long- 

 est and most numerous, those about 

 the anterior apex radiating in an al- 

 most horizontal direction ; flagellum 

 long, slender ; endoplasm yellow ; 

 contractile vesicles mutliple, confined 

 to the posterior body-half; nucleus 

 not observed. Length of body yJ^„ 

 inch. Habitat. — Marsh water, with 

 Sphagnum. 



This pretty creature is remarkable 

 for the naked condition of the central 

 portion of the body surface, a charac- 

 teristic readily differentiating it from 

 the other members of its genus hith- 

 erto described. This species recalls, 

 in this respect the Holotrichous Cycli- 

 dium litomesum described by the 

 writer in the American Monthly 

 Microscopical Journal^ December 

 1884, i'^ which a similar arrangement 

 of setose cilia obtains, the central cvi- 

 ticular surface there also being quite 

 naked. This condition will necessi- 

 tate a slight change in the diagnosis 

 of the fainily and generic groups as 

 now formulated. 



The endoplasm is lemon yellow in 

 color, the pigmentary matter appear- 

 ing to be collected in two somev^^hat 

 indistinct lateral bands, the interven- 

 ing pale, almost colorless, strip of 

 sarcode filled with fine granular mat- 

 ter, near the centre of which is located 

 what seems to be the nucleus, the 

 latter, however, being very obscure. 

 The oral aperture and the continua- 

 tion as a narrow pharyngeal passage 

 are usually distinct, the former quite 

 conspicuously so. 



Lacrymdria vertens^ sp. nov. 



(Fig. 5-) 



Body subcylindrical, soft, flexible, 



and somewhat extensile, about three 

 times as long as broad, longitudinally 

 striate ; constricted near the middle, 

 the lateral borders consequently con- 

 cave ; cilia fine and numerous ; api- 

 cal extremity rounded, oral cilia 

 numerous ; contractile vesicle single, 

 spherical, postero-terminal ; nucleus 

 ovate, conspicuous, located in the 

 anterior body-half; endoplasm usu- 

 ally coarsely granular. Length of 



