156 INTERNAL ANATOMY OF INSECTS. 
] u doptcra and the humble-bee there are four a ; in the 
common louse there are five b ; in the rhinoceros-beetle 
and the cockchafer, six c ; in the wasp, seven d ; eight in 
the cockroach e ; twelve in the Carabi and the mealworm- 
beetle f ; thirty in the large green grasshopper (Acrida 
viridissima g ) ; thirty-two in the cheese-maggot-fly h ; and 
in the hive-bee more than a hundred andffty '. 
The number of eggs also contained in the ovaries 
varies. In Echinomyia grossa there is only one egg in 
each, and only two at once in the matrix k : in another 
fly produced by the cheese-maggot there are four l ; in 
the louse there oxefve ; in the cockchafer six m ; in the 
hive-bee sixteen or seventeen are visible at the same time"; 
and in the silkworm-moth sixty or seventy °. Besides 
the eggs, the tubes contain a pellucid mucus, and at 
their upper extremity the eggs are lost in a granular 
mucous mass, in which, however, they may still be dis- 
covered with a microscope f. With regard to the ter- 
mination of the ovaries or egg-tubes internally, — in those 
that have agglomerated ones it is not to be traced, the 
whole appearing like an oblong obtuse or acute body i : 
but in the branching ones it is more easily traced; at 
first they converge in most cases to a point ; this is seen 
to advantage in the caterpillar of some butterflies, when 
near assuming the pupa, in which they are readily dis- 
covered, and represent with great truth and elegance the 
a Ibid. i. 203. h Plate XXII. Fig. 2. 
c Swamm. ubi supr. i. 151. Gaede Anat. der Ins. I. ii.f. 3. 
" Swamm. i. 203. 
« Gaede Anal, der Ins. 20. /. If. 9. f Ibid. 25, 28. t. W.f. 1 0. 
E Ibid. 32. h Swamm. ii. 74. s Ibid. 203. /. xix./. 3. 
k lleaum. iv. 391 — . ' Swamm. /. xliii./. 19. "' Gaede 22. 
n Swamm. Bibl. Nat. i. 203. ° Ibid. p Rifierschw. 11_. 
q Swamm. /. xlii./. 8. Gaede, I. \.f. 3. cc. 
