32 THE EOTIFEEA. 



toe lay inside the other, so that the two appeared to be one. Further investigation will 

 be necessary to determine this Eotiferon's true position. 

 Length, ^fif mcn - Habitat. Near Berlin (Ehr.). 



D. (?) MARINUM, Ehrenberg (42), (PI. XXXIII. fig. 16). SP. CH. " Body ovato-conic ; 

 foot long ; toes stout, equal in length to the foot ; eyes close together, red" Ehrenberg 

 marks this as a doubtful species ; and indeed it resembles the rest of the genus in only 

 one point, viz. in having two cervical eyes. These are closely pressed together, so as to 

 look somewhat like those of a Brachionus. The trophi, too, have five teeth in each 

 malleus, and are very unlike those of D. raptor (PI. XIX. fig. 1 b}. Ehrenberg's 

 drawing seems also to show the presence of a transparent lorica, with a round opening 

 for the foot. It is obvious that this Eotiferon must be more carefully observed, in order 

 that its proper position may be assigned to it. 



Length, T | T inch. Habitat. Baltic Sea (Ehrenberg and Eichwald '). 



D. (?) FORCIPATUM, Ehrenberg (42), (PI. XXXIII. fig. 17). SP. CH. " Body ovato- 

 oblong ; foot short; toes thick; eyes colourless." A doubtful species, scarcely described 

 at all, and feebly drawn. Ehrenberg merely says of it that it is vehement in its motions, 

 and predaceous. 



Length, about 2 iy inch. Habitat. Near Berlin (Ehr.). 



Genus TRIOPHTHALMUS, Ehrenberg. 



GEN. CH. " One of the NOTOMMATAD^E, with the three cervical eyes in a transverse 

 row, and a forked foot." 



TKIOPHTHALMUS DOESUALIS, Ehrenberg (42), (PI. XXXIII. fig. 20). 



Ehrenberg merely says of this fine Eotiferon (which is the only species of the genus) 

 that its body is hyaline, swollen, and with a suddenly diminished foot, half as long as 

 the body : that it resembles Notommata ansata in form, and Asplanchna myrmeleo in 

 size ; and that he regrets his having observed and drawn it under too low a power. 



Mr. Gosse met with it once, and says, in a manuscript note, that " the front is pale 

 orange, the brain saccate, and the eyes in a row near (not at] the end of the brain. 

 Over the foot hangs a bulbous joint, which looks, laterally, like a tail. The creature 

 resembles a stout-built Notommata aurita or naias." 



M. Eckstein (41) gives a large figure of dorsualis, in which the internal structure 

 is distinctly displayed ; and describes an additional gastric gland lying in a cluster of 

 folds, close round the stomach, and containing many large clear vesicles. I think that 

 M. Eckstein has, here, mistaken the thick-celled walls of the true stomach for a gastric 

 gland ; and has considered a distended portion of the oesophagus to be part of the true 

 stomach. I have often seen Synchceta trcmula, Notops hyptopus, and Notops clavulatits 

 with a portion (and even the whole) of the long oesophagus, so fully distended with food, 

 that it was continuous with the stomach ; and so had the precise appearance of M. Eck- 

 stein's drawing. For, owing to the delicate thinness of the cesophageal walls, and the 

 thickness of those of the stomach, when both become stuffed with a continuous mass of 

 food, the stomach cells seem to be in a thick belt round that mass, and show off their 

 oil globules to advantage on the dark ground. 



M. Eckstein adds, that of the three cervical pigment spots, the centre one only is 

 completely rounded, and that those on either side of it seem incomplete towards the inner 

 edge. Mr. Gosse's drawing, too, confirms this observation. But M. Eckstein has also 

 seen two red spots on the top of two low frontal prominences. These Mr. Gosse failed 



1 Unfortunately Eichwalcl's account of this creature (4.") adds nothing whatever to that of 

 Ehrenberg. 



