A Neiv Species of Megaloirocha. By V. Gunson Thorpe. 615 



The junction of the pseudopoclinm, or foot, with the trunk is well 

 marked by a constriction, and presents a peculiar, and I believe 

 unique, structure. The dorsal surface of the upper extremity of the 

 foot is prolonged upwards and outwards, to form a triple expansion, 

 somewhat in the form of a trefoil. The middle portion of this process 

 projects prominently outwards on the dorsal aspect, and to it the eggs 

 are attached, after exclusion from the cloaca. The lateral portions, 

 like buttresses, closely embrace the lower extremity of the trunk, 

 which is wedged in between them. 



The ciliary wreath is almost quadrilateral, and is placed obliquely 

 looking towards the dorsal aspect. The animal has a habit of 

 doubling the corona on itself, so that a view from above can frequently 

 be obtained of the buccal orifice and the relative position of the two 

 warts to it. 



The two opaque ii-arts are situated one on each shoulder, on the 

 ventral surface below the corona. Even with a pocket-lens they may 

 be distinctly detected as little black dots scattered over the surface of 

 the white cluster-ball. When the animal contracts, they stand up 

 prominently above the surface of the indrawn head. 



Below the warts, on the ventral surface of the trunk, may be seen, 

 by careful focusing, two minute setigerous pimples — the ventral 

 aniennse — in position resembling those of Conochilus dossuarius, but, 

 unlike them, being distinctly separate, a considerable space inter- 

 vening. 



The tropin are orange-tinted, and of the malleo-ramate type. 

 The unci, passing from the mallei to the rami, are three-toothed. 

 The extremity of each tooth attached to the manubrium is bifid, one 

 division being soldered to the upper surface of the manubrium, the 

 other division, curving backwards, lies in contact with its inner side. 

 The fulcrum is very slender, and appears to be double-jointed. 



The oesophagus is lined with quadrilateral cells, and has salivary 

 glands on either side. The stomach is capacious, richly lined with 

 cilia, ^\ith large gastric glands in contact with it. The intestine takes 

 a short sharp curve upwards towards the dorsal surface, and ends in 

 the cloacal opening at the junction of the upper three-fifths with the 

 lower two-fifths of the trunk. 



The lateral canals possess two pairs of vihratile tags, one pair 

 within the corona, and one on either side of the stomach. A con- 

 tractile vesicle has not been detected. 



The eyes are two minute bright-red spots on the upper edge of 

 the dorsal surface of the corona, between the inner and outer rows oi' 

 cilia, but nearer the inner wreath. 



There is a large ovary between the ventral body-wall and the 

 stomach. The egg, after extrusion from the cloaca, becomes attached 

 to the middle portion of the triple expansion of the foot above 

 described. Two ova may often be seen thus attached, side by side, in 

 one or both of which the movements of the unborn rotiferon, with its 

 red eyes, may be distinctly visible. In one instance I saw a young 



