620 



Litterat 11 r. 



1824. Meckel, System der vergleichenden Anatomie. 2. Theil. 1. Abth. 



1851. Gau dry, Mémoire sur les pièces solides chez les Stellérides. 



1852. M. Schult ze, Über die Entwieklunj^ von Ophiolepis squamata , einer leben- 



dig gebärenden Ophiure. Arch. Anat. Physiol. 

 1854. Joh. Müller, Über den Bau der Echinodermen. 

 1874. Lyman, Opkiuridae and Astroplitjtidae , New and Old. Bull. Mus. Comp. 



Zoology, Cambridge. 

 1876. Simroth , Anatomie und Sehizogonie der Ophiactisvirens. Z.Aviss. Zool.XXVlI. 



1878. H. Ludwig, Beiträge zur Anatomie der Ophiuren. 



1879. Viguier, Anatomie comparée du squelette des Stellérides. Archives Zool. 



Expér. T. VII. 

 1882. Ludwig, Zur Entwicklungsgeschichte des Ophiurenskelettes. Z. wiss. Zool. 



XXXVI. 

 1882. Lyman, Ophiuroidea (Challenger Exped.) 



4. A Case of Supernumerary Wings in Pieris rapae L. (Lepidoptera) ^ 



By Geo. W. Tannreuther. 

 (With 3 figures.) 



eingeg. 23. Juli 1901. 



Supernumerary wings in insects are of rare occurrence, and relati- 

 vely few cases have been described. Such rarities are of course 



greatly prized by insect col- 



TR D lectors so that it has not been 



,..•::■■■■>••■■. v-.^v-, possible to examine any of 



■ "'■' the recorded cases carefully. 



, AT The twenty or more cases 



L,: , ,, \ described by B a teson (Ma- 



'^Y ■. terials for the study of Varia- 



\ tion. 1894) were all of dried 



imagines, and in none of 



these was he able to examine 



1 / closely the structure or at- 



\ tachment of the abnormal 



V members. Of considerable 



interest is the discovery of 



ALS ^^^ abnormality of this kind 



in a prepupa of P. rrt/?ae L. 



■ ... ,.....•••■■ In a series of sections of 



a prepupa, about thirty hours 

 Fig. 1. P. rapae. Surface view of right anterior . ~ . • f 



wing with abnormal wing beneath. (From graphic l^etore pupation, a pair 01 

 reconstruction.) ^ L, normal wing. ^i/S, super- outgrowths of the hypoder- 

 numerary wing. TJiZ), dorsal tracheal trunk. Â''F, . j- j 



nervesofwinl. B.&L. 2inobj.2inoc. 160mm. »^^S were discovered upon 



the mesothoracic segment, 

 lieing beneath the wings, and closely resembling a wing in an early 



1 Contributions from the Biological Laboratory of Antioch College No. 4. 



