KONGL. SV. VET. AKADEM1EN8 HANDLINGAR 



ISAM 



. 34. 



n:< 



. 8. 



L3 



Larva of Olenellus asaphoides, chiefly according to Foed and Walcott. 



i^t 



^ <• * 



rn 



1. Hypothetical tigure, ba- 

 sed on flg. 2, represents a 



stage preceeding the next 



There are three pair of ple- 



ura and three segments of 



the rhaehis. 



2. Copy of W \i,c ni i s tig. 5 

 in BuUet. L886 p] XVII 

 Tlircc plenra at riglil . I«u 

 at left, the larger formed 

 tlirough fusion of the two 

 hiudmost iii tig. 1. 



3. Copy of Walcott's flg. 



t>: the second and third 



pleura have been unitrd 



into one. 



1. Hypothetical tigure 

 as .i fnrther de\ elopmenl 

 following ii [mil the stage 

 represented in lig. '.'>. Fu- 

 sion eompleted bel « een al] 

 jiosterior pleura (2, 3, 4), 

 thus forming a single large 

 pleuron composed of the 

 three mentioned. 



5. Copy of Ford's flg. 1, 

 pl. IV, Amer. Journ. Sei- 

 ence 1877, enlarged to the 

 same size as Walcott's. 

 First sign of the pygi- 

 dium. 



G. Copy of Ford's flg. 2 



(1877) enlarged. The py- 



gidium has been added to 



the head ahield. 



7. Copy of Ford's tig. .">, 

 enlarged. 



8. Copy of Ford's flg. 1 



page 251 in Am. Jonrn. 



Oct. 1881, enlarged. 



9. Copy of Ford's flg. 2 

 pag. 251. Amer. Journ. 

 Science 1881. Slightly en- 

 larged. 



10. Copy of Ford's tigure 

 ."). pl. IV, Amer. Jouru. 

 Sci. 1877, slightly enlarged. 



K. Sv. Vet. Akad. Handl. Band 34. N:o 8. 



