3°o 



A. TERAO 



positions. They number 157 in all, thus coming in this respect very near 

 to S. challcngcri, for which both Hansen and Kemp have given the number 

 to be over 150. The topographical distribution of the organs is also closely 

 alike in the two species. In the present species I have determined their 



distribution in the body to be as follows :, 



Inner surface of branchiostegitcs Three pairs. 



Eyestalks Two pairs. 



Third joint of antcnnular peduncles One pair. 



Between bases of first antennae Single (median). 



Squamae of second antennae Three pairs. 



Fifth joint of antennal peduncles One pair. 



Bases of second antennae Two pairs. 



Near anterior end of labrum Single (median). 



Lateral sides of labrum One pair. 



Penultimate joint of mandibular palpi One pair. 



Mandibles proper One pair. 



Bases of mandibles Two pairs. 



Bases of first maxillae One pair. 



Sterilite between bases of first maxillipeds Two (median). 



Second maxillipeds Four pairs. 



Bases of second maxillipeds Two pairs. 



Sterilite between bases of second maxillipeds Single (median). 



Third maxillipeds Four pairs. 



Sterilite between bases of third maxillipeds Three (median). 



First peraeopods Two pairs. 



Stcrnites between bases of first peraeopods Three (median). 



Second peraeopods Two pairs. 



Sternite between bases of second peraeopods Five (median). 



Third peraeopods Three pairs. 



Sternite between bases of third peraeopods Five (median). 



Fourth peraeopods One,' pair. 



Sternite between bases of fourth peraeopods Five (median). 



