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of the genital apparatus. There is an analogous development at the 

 othei- end of the body-tubes in the complex strnctare of the eye, where 

 the lens (cornea) has its origin in the outer body-tube, while the 

 sensitive structures are developments from the inner body-tube, the 

 whole having become welded together into one complex organ the eye. 

 The following is an analysis of the Terminology used in the 

 present volume : — 



One would like to have had a mvich more detailed comparison or 

 collaboration of the later terminology with the earlier one, as one 

 finds it difficult to assimilate the two, there being only a few of the 

 essential parts which are common to both the Noctuidae and the 

 (jreoiiietridae, while numerous secondary parts are either only present 

 in one group or are looked at from a different relative standpoint in a 

 different correlation, and have received a different name. Definite 

 statements might have been given as to special parts, which are 

 present in the former group, but of which there is, apparently from 

 the text, no trace in the latter group. (1) The Peniculus, a brush 

 of hairs on either side of the tegumen and not mentioned as being 

 found in the Geometers. (2) The Cucullus of the Xactuidae, the 

 upper portion ^of the Valva, is apparently that part which is now 

 named the Costa, but no reference is made to the former term. As 

 a fact the Cucullus is an apical development of the Valva, not present 

 in the Geometridae. (3) The central part of the Valva, which in the 

 Noctuidae received no separate name, is now termed the Valvula, and 

 the armatures on its surface, which were in the former called the 

 Clasper and Ampulla, are now taken as one structure, when present, 

 and termed, the Harpe, after Gosse. This term is adopted without 

 any reference to the names previously used for the parts in the 

 Noctiiidac. (4) The Edituui of this area is apparently not present 

 in the Geometrids. (5) The Costa has not such a series of appen- 

 dages and extensions as the apparently homologous Cucullus has in 

 the Xoetiiidae, for no mention of, nor comparison with them is made. 



