134 CRESSWELL SHEARER, WALTER DE MORGAN, H. M. FUCHS. 



Tuj.o. 



— ::^i^.CU 



Fig. 4— Larva of E. escnlentns $ x E. miliaris 9 . Dorsal view. x 36. Forty days 

 old. Although it is twice the age of that shown in Fig. 3, there is little differ- 

 ence between them, except in size. Lettering as before. 



This pluteus is twenty days older than the pure E. miliaris (Fig. 3), 

 but beyond an increase in size there is little difference. 

 The chief external features of this hybrid are : — 



The anterior ciliated epaulettes. 

 Tv:o pedicdlariac. 



One right side dorsal. 



One right side ventral. 

 Masses of green pigment. 



(c) EXTERNAL CHARACTERS OF THE LATE LARViE 



E. ACVTUSS 

 E. ACUTUS9 



Regarding E. acutus and E. cscnlcntus as distinct species, it 

 might be expected that their late larvse would show some marked 

 specific dift'erences. Such differences we have, however, been so far 

 unable to discover. The late larva of F. acutv.s resembles that of 

 U. escidentus in number and position of pedicellariae, of ciliated 

 epaulettes and in the absence of green pigment. Superficially the 

 larva of E. acutus has a smaller body and slenderer arms, with darker 

 and more abundant pigment than that of E. esculentus, but hybrids 

 between these species afford no criteria by which parental influence 

 can be discriminated. 



Hybrids, however, between E. acutus $ and E. miliaris <^ resemble 

 those between E. esculentus S^ and E. miliaris 2 , in the absence 

 of the posterior pedicellaria and of the posterior ciliated epaulettes 

 and the possession of green pigment masses, while in the reciprocal 



