HiLGENDORF. — On ]S!civ Zealand Eotifera. 125 



hemispherical projection, also cilia-covered, and also bearing 

 the small red eye. This little ciliated and eye-bearing lobe 

 constitutes the chief diifereuce between my variety and that 

 described by English writers, but it is not enough to need the 

 formation of a varietal name. The lorica is vase-shaped and 

 entire, but for its dorsal cleft, which is not complete, occurring 

 only posteriorly, and so exactly corresponding wuth the 

 English semiaperta. The mastax is of the highly developed 

 forcipate variety, though I can hardly vouch for the details of 

 my figure. It is situated far forward, completely within the 

 head. The other parts of the alimentary canal were quite 

 obscure, the only thing noticed being that they occupied the 

 usual dorsal position. No particular muscles, glands, or 

 brain were noticed. The peculiar position of the eye, on a 

 lobe apparently its own, and further forward than in any 

 other variety, has already been noticed. There is a large 

 female reproductive gland, situated ventrally. 



The movements of this Eotifer were of the briskest order ; 

 it never seemed to rest. During fifteen minutes I saw ic try- 

 ing with cilia and trophi to swallow one of its little cousins — 

 D. taicrocejjJiahis, var. tenua. The head of the intended 

 victim was well within its captor's maw, but there it stayed, 

 and semiaperta at last gave it up, sailing away for fresh fields, 

 and leaving taurocepliahia (tenua) in quite a disabled con- 

 dition. This is the only case of cannibalism I noticed. 



Hah. Spirogyra, in the small pool, and I think also in 

 another, half a mile awav over a hill. 



Genus Postclausa, nov. gen. 

 Generic characteristics : Body greatly compressed. One 

 cervical eye. Head and foot very flexible, and protrusible. 

 Lorica open in front, but completely closed behind and below, 

 with the exception of a small orifice for the foot. No spines, 

 but knobs in ornamentation. Trophi virgate, but very slender. 



XI. Postclausa niinuta, sp. nov. Plate X., figs, xi., xi.a. 



Specific characters : Minute; long and low in general shape. 

 There are four ornamental knobs on the lorica — two at the 

 orifice for the head and two at that for the foot. Dorsal 

 cleft very narrow and deep. Eye and brain conjoined in the 

 cervical region. 



The smallest Eotifer I have seen, being considerably less 

 than Diaschiza taurocephalus. No colour, except that due to 

 food and to the small red eye. The general shape of the 

 Eotifer is that of a very fat sausage, about twice as long as 

 thick, rounded at both ends, and quite wanting in angles. 

 The body proper comprises almost the whole of this outline, 

 since the foot is small and pendent. It projects not from the 



