86 K. KISHIXOÜYE. 



vascular system of the American Liviuhis. niid tliat it will be found to 

 l)e formed in the same way as the Japanese species. The nnml)er and 

 position of the oslia of the American Liiiiuhis (fig. IS) agree exactly 

 with those of the embryo of the kdhu'ogoni [Wg. 17). 



Dorsum and Venlrum. 



Tlie componnd eyes of the adult Linitiliis are very peculiar in this 

 that tliev lie in tlie thoracic region and on the dorsal sui'face of the 

 céphalothorax. Previous writers differ in their opinions, as to what 

 thoracic segment the lateral eyes belong to, though all of them allow 

 that the lateral eyes are thoracic. If now the lateral eyes really belong 

 to a thoracic segment, it is an exceedingly interesting fact, for there is 

 no parallel in other animals. 



AVhen we look into the matter more carefully, we are struck, first 

 of all, with the iiict that the lateral eyes are innervated from the brain 

 — a fî'.ct well known for a very long time. Xow if they really belong- 

 to a th<,racic segment, they ought to receive their nerves from the 

 o-anolia ofthat sei»inent, and it is, to say tlie least, verv peculi;ir that 

 tliev should be connected with the brain and not with the ganglia 

 of a thoracic segment. 



Examining the adult animal (fig. IJ) we find that the dorsal surface 

 of the ceplialoihcracic shield is divided into five, while that of the 

 abdominal shield is divided into three longitudinal lobes, as in the 

 Trilobites (fig. \). These lobes I name after the corresponding lobes 

 of the Trilobites — the median urjpaired lobe as the g!ahcUa in the 

 céphalothorax, sind as the racJiis in the abdomen, the first (internal) 

 paired lateral lo^jes as the fixed chcclcs in the céphalothorax, and as the 



