rHILODINADzE. 11 



Callidina aculeata, Milne (PI. XXXII. fig. 11). 

 Macrotrachela aculeata Milne (18C). 



SP. CH. Body somcxvliat fish-shaped, with three or four posterior rotvs of spiincs, 

 and one anterior roiv near the mastax ; foot about | of total length, with three short 

 toes ; spurs J width of penultimate joint. 



Mr. Milne met with but few si^ecimeiis of this remarkable Callidina. Its body has 

 many longitudinal furrows ; and Mr. Milne draws the four rows of spines with as many 

 as five or six spines in each row. 



Length, ^i^ inch. Habitat, Near Glasgow (Mihie). 



Callidina socialis, Kellicott (181). 



SP. CH. Covona, relatively icide ; column thieh and ciliated ; dorsal antenna sAor^, 

 terviinatcd by iiuiny minute, sctiforous pointed elevations ; spurs long and stout ; teeth 

 two. Parasitic on the limbs and dorsal folds of the larva of the beetle Psepheuus 

 Lecontei. 



It is a slender elongate form ; when the body is fully extended the width of the corona 

 considerably exceeds that of the body. The body is transparent, without colour, except 

 the light brown of the stomach, apparently imparted by contents of that hue. The 

 longitudinal flutings of the trunk, and the transverse folds above and below these are 

 conspicuous. The contractile vesicle was not observed. Many examples of the larva 

 were examined, every one of which was infested by the Kotiferon ; often scores were wit- 

 nessed, clinging in groups. 



Length, (when fully extended) ^, inch. Habitat, Corimna, Michigan (Kellicott). 

 Callidina consteicta, Dujardin (iO). — Dujardin merely states that this Callidina has 

 a very small corona, and rami crossed by fine parallel teeth. There is neither description 

 nor figure of the proboscis, dorsal antenna, or foot ; it is impossible to say whether it is 

 distinct from those species already described. 



Callidina coknuta, Perty (124). — This also is an imperfectly described animal. Perty 

 only says that it is neither constricta nor elcgans, that it has a Notonimata-like projec- 

 tion on each side of the head, and that its jaws are like those of constrieta. He gives 

 no figure. 



Callidina eediviva, Ehrenberg, is described as being " fusiform, difl'usely granular, or 

 else fleshy ; with red distinct ova, and strong rotatory organs. In the sediments of water- 

 spouts of houses, Berlin. Length, „'„ to ^^^ inch." ' 



C. ALriNA and C. scaelatina, Ehrenberg, are Alpine species, of wliich I can find no 

 details ; except that scarlatina was found dried up, like pink dust, near the tops of 

 the Alps. 



Genus DISCOrus, Zelinka (206). 



GEN. CH. One of the Philodinadaj ; eyeless, the last two joints of the foot converted 

 into a great sucker ; the foot glands arranged in tivo transverse rotes, and fastened later- 

 ally and ventrally to the inner surface of the body-wall; ducts of the foot glands 

 running down to the last joint of the foot, and insulated in a capstde. 



Discopus SYNAPT.E, Zelinka (200), (PI. XXXII. fig. 5). 



This parasitical Eotiferon was discovered by Professor E. Piay Lankester, in 18C8, in 

 the body-cavity of the Synaptie of the Channel Ishuids. Dr. Lankester had neither the 



' I'litchard'b Infusoria. Uh ed. )). 702. 



