496 ZOOLOGY. 



' When viewed from above, the body of the animal is found to 

 be pyriform, with the anterior edge rounded, and the posterior 

 extremity ending by means of a point. The whole body consists 

 of three segments : the first forms the greater part of the body ; 

 the two last are minute. Two long unarticulated extremities 

 project from the anterior edge on either side of the mesial line, 

 arising, apparently, from the abdominal surface of the body. Two 

 short antennae arise also from this edge, immediately on each side 

 of the above- described extremities. 



' The eye is situated a little behind the anterior edge, and in 

 the mesial line of the body. 



' Two very strong thick legs arise from each side of this first 

 segment of the body. These are bipartite, each division arising 

 from a pedicle common to both, which consists of three segments. 

 The divisions themselves are apparently unarticulated, but are 

 armed with a number of very strong spines. 



' The second segment of the body is minute. The third and 

 last is also minute and pointed, and is armed with three strong 

 spines, which are bent to one side (the left side), that nearest 

 the right side being the shortest. 



' All of these larvae swim after the manner of the monoculi, by 

 short and sudden jerks. They propel themselves by means of 

 the two pairs of spined extremities. The tail is also in constant 

 motion.' H. G., in E. P. Journal. 



"By the minute and prolonged study of the metamorphoses of 

 animals, we thus prove that these so-called imperfect forms, or 

 forms in transitu, are the permanent forms of adult extinct and 

 recent animal beings. Thus we upset the theory of the transmu- 

 tation of species, and creation of new forms ; for these forms are 

 embraced in the embryonic, and require but time and circum- 

 stances for their full development : nevertheless, I willingly 

 concede to my esteemed friend, M. Valenciennes, that the natu- 

 ralist is only interested in adult forms, these being the highest 

 specializations to which animals attain: it holds even in man 

 himself."* R. K.] 



* See my Manual of Artistic Anatomy. Renshaw, London. 



