The Parasites of the Cockroach. 837 



varieties of this species liave been discovered, some witn larger 

 and. some with smaller fronds. Variety elongata has a larger, 

 more elongated, and straighter frond than ordinarily met with. 

 This is the variety maxima of Weber, and is chiefly fonnd on 

 rocks in subalpine districts. Variety ceruginosa has a broader 

 frond of a bine-green colour, and, except in the gemmiferous 

 plant, the extremities, or apices, are dilated and very obtuse. 

 This is the Jungermannia fruticulosa of English Botany, and 

 the Riccia fruticulosa of Dickson. It is found on trees in the 

 West of England, Scotland, and Ireland. 



The fructification of this and of Jungermannia jpubescens, a 

 nearly allied species, is, as Hooker remarks, very peculiar, 

 anthers being found on the costa, on the under side of the 

 frond, inclosed in and attached to a costate scale, rolled up 

 like a ball ; and gemma? are met with on the ceruginose variety, 

 terminating narrow prolongations of the forking of the frond. 



Thus we have endeavoured to give our readers some fea- 

 tures characteristic of the winter fruiters belonging to this 

 singular and anomalous tribe of plants, whose protean shapes 

 and wondrous economy have been too long neglected, but 

 which, we trust our intellectual readers will prove for them- 

 selves, can lend a fascination to many a winter walk, and 

 whose microscopic investigation can afford a charm to many 

 an hour of fireside enjoyment. 



THE PAEASITES OF THE COCKKOACH. 



BY E. EAT LANKESTEE. 

 {With a Tinted Plate.) 



Or all classes of animals which come under the notice of the 

 zoological observer, none are more attractive subjects for study, 

 nor add more to the mysterious beauty of nature, than those 

 which, by the peculiar modifications of their structure, are fitted 

 to inhabit the intestines and viscera of other beings. What 

 vast fields of speculation open out before us in considering their 

 origin ! Were they primarily created with the animals they 

 inhabit, or have their original ancestors, infesting the food of 

 their present host, been swallowed, and established themselves 

 and then progeny as permanent visitors ? . The remarkable 

 migrations to which some of the higher Entozoa are addicted, 

 and the various forms which they assume, according to the 

 animals which they happen to occupy, is one of the most remark- 



