28 Dr. C. T. Hudson on Rhinops vitrea. 



that the animal made a conscious effort to seize prey of whose 

 presence it was aware ; and it is the first rotifer whose actions 

 would lead me to credit its red spots with being eyes. 



It is curious, too, to see how it presses together the broad 

 flaps of the trochal disk when an unusually large atom has 

 entered the cavity above the buccal funnel. 



The pseudopodium is a short, extremely transparent cone, 

 ending in two minute toes, and capable of being drawn up 

 into a fold of the trunk, so as to leave only the tip exposed. 

 It has in it what appears to be a club-shaped gland, from 

 which a prolongation runs upwards in the median line : this 

 latter does not seem to be a muscle, as it simply bends into a 

 sigmoid curve when the foot is drawn up. 



The muscular system is shown in PI. II. fig. 1, which re- 

 presents Rhinqps held down by the compressorium. Four lon- 

 gitudinal muscles, a a, b b } spring from the same points, ff t 

 and proceed to the edges of the trochal disk ; they are tied to 

 the cuticle at g g, and the outer pair again at e e. The muscles 

 cc also act in drawing down the trochal disk, and send off 

 branches, d d, to the proboscis. The pair h h draw up the foot, 

 and the five incompletely circular muscles at k compress the 

 trunk and force out the retracted trochal disk or foot. 



The mastax (fig. 2) contains the usual mallei and incus, the 

 former with five teeth, b b } the latter with ridges, a a, on the 

 inner edges of the rami. 



The proventricular canal is long ; and the stomach has thick 

 walls, in which yellow oil-globules are frequently imbedded : 

 it is divided by a constriction into two portions, of which the 

 lower is densely ciliated. The cloaca opens in the usual posi- 

 tion, where the trunk meets the foot, and is also ciliated. 



The two gastric glands on the upper surface of the stomach 

 are transparent subcones, with their bases on the stomach ; 

 oddly enough, they are not generally of the same shape, one 

 being more bent than the other. 



There is a moderate-sized contractile vesicle, and tubes or 

 cords passing up from it on either side to the trochal disk, 

 under which they end in numerous convolutions bearing three 

 vibratile tags. 



The proboscis appears to contain a nervous mass (fig. 3 o), 

 which sends off two processes, a a, to its unciliated tip, and 

 one, &, to each eye. I have been unable to detect any antennas 

 or tactile setse ; but I imagine that the tip of the proboscis is 

 an organ of touch. 



The ova become so developed before being extruded, that 

 the young animal quits its case and fills up a large portion 

 of the body of its parent. I have seen several specimens in 



