42 



HISTORY OF CRUSTACEA. 



CHAP. VI. 



with four (or five ?) fissures, which are not placed in 

 pairs but alternately to the right and left in successive 



segments. In other 

 animals of this order, 

 which I have as yet 

 [ V only cursorily examin- 

 [ ed, further differences 

 I will no doubt occur. 

 But why, in two orders 

 so nearly allied to each 

 V other, should we find 

 in the one such a con- 

 stancy, in the other 

 such a variability, of 

 the same highly im- 



Fi g . is. Fig. 15. 5 portant organ ? From 



the schoolmen we need 



expect no explanation, they will either decline the dis- 

 cussion of the " wherefore " as foreign to their province, 

 as lying beyond the boundaries of Natural History, or 

 seek to put down the importunate question by means of 

 a sounding paraphrase of the facts, abundantly sprinkled 

 with Greek words. As I have unfortunately forgotten 

 my Greek, the second way out of the difficulty is closed 

 to me ; but as I luckily reckon myself not amongst the 

 incorporated masters, but, to use Baron von Liebig's 

 expression, amongst the " promenaders on the outskirts 



5 Fig. 15. Heart of a young Anilocra. 



6 Fig. 16. Abdomen of the male of Entoniscus Cancrorum. li. Heart. 

 I. Liver. 



