108 PHYLLOPODA. 



have given its progress from the egg, which corresponds with the 

 changes observed in Artemis, and indeed the latter author has fa- 

 voured us with such full and accurate details of its structure, and 

 such excellent figures, as to leave little to desire on this subject. 



Branchipus, 



By the removal of the two former animals, this Genus will be 

 restricted to one species, viz. B. Stagnalis (the Apus Pisciformis of 

 Schoeffer), PI. 3, f. 1,2, 3, the male; PI. 4, f. 2, head of female. 

 This, which appears to be a comparatively rare animal, is distin- 

 guished by what seem to be two pair of antennae in the male. The 

 Horns are rather small, and bifurcate at the extremity ; the tail ter- 

 minating in two taper ciliated scales. Found by Schoeffer in a ditch 

 by the road which leads from Ratisbon to the town of St. Nicholas. 



^p 



US Guildingi; a new species. 



This, I received together with the Artemis Guildingi from the 

 West Indies, and having as yet no details, must leave its history in 

 the hands of its distinguished discoverer. It is of a light blackish 

 colour, the clj^eus translucent, almost membraneous, and shorter 

 in proportion than in any of the known species, with the extreme 

 branchof the anterior member extremely long; in other respects it 

 differs from them but little.. . I may here observe, that there appears 

 to be two European species confounded under the specific name 

 Cancriformis, viz. Schoeffer's and Dr. Leach's, which most resemble 

 the above species, and that detailed by Mons. Savigny, in which the 

 elongated Clypeus entirely covers the natatory members. 



Of the Fossil Genera, Buceplialithus 8f Ogygia, 8fc, 



The Fossils Which constitute these Genera, and the other Eyeless 

 Trilobites, which form Mons. Desmarest's Genus Paradoxides, are 

 but little known to British Geologists, are only found in a particu- 

 lar part of Sweden, and in one locality in France, and are extremely 

 rare in Collections, even in those countries ; interesting as they are 

 from these circumstances, and their appearing to have been the first 

 created animals, they come doubly recommended to our notice since 

 tlie discovery of the liA'ing type in Artemis, which seems to connect 

 them with the present race. Unlike those almost microscopic Crus- 

 tacea, however, these present us with animals of gigantic size in 

 comparison, many of them having exceeded a foot in length ; and 

 as all the other individuals of this tribe are provided with a distinct 

 organ of vision, even in their larva state, analogy will not permit us 

 to believe that they were absolutely deprived of sight, which to an 

 animal of such size, and possessing locomotive powers, must have 

 been indispensable to the pursuit and capture of its prey. When it 

 is considered, that these fossils are very rarely found entire, bxit al- 

 most always in detached portions, it is not surprising that these de- 

 licate members, seated on a narrow pedicle, and articulated to the 

 sides of the head by membrane only, should have been lo:>t; and 

 their point of attachment rendered inccn.'^picuoub. 



