82 



HLSAÏO KUWANO. 



cmj 



of thein are confluent 1 , on each side, to a common gill cavity which 

 discharges to the exterior by a common gill-pore 2 (Fig. 3, cgp.) ; 

 epithelium of the outer surface of the gill tongues is infolded into 

 the tongue cavity ; synapticula on each side of a tongue-bar is 15-17 

 in number ; the respiratory and nutritive portions of the oesopha- 

 gus are nearly equal in size ; gonads coextensive with the genital 

 pleurae ; secondary gonads well developed ; postbranchial canal is directly 



continuous with the respiratory por- 

 tion of the oesophagus and its ante- 

 rior end carries the last pairs of the 

 gill-slits 8 ; the proximal origin of the 

 lateral septa passes abruptly over 

 the wall of the postbranchial canal 

 from the gut wall and thence, the 

 origin is again transferred on the 

 epidermis to terminate on with the 

 both origin and the insertion ; in 

 the hepatic region 4 , the epidermis 

 makes inteisaccular involutions in 

 a remarkable manner 5 , ciliated 

 Pig 4 grooves are paired and confined into 



Transverse section through the anal region to the hepatO-abdotuilial region J the 

 *how the circular muscle fibres going rounil the gut 



waii. grooves appear in their typical form 



cm/, circular muscle fibres, gc. gut cavity, Imf. . . . 



longitudinal muscle fibres, peli, pygochord. Only 111 the hepatlC reglOll, while 



1. ) In Glossobalanus hedleyi, the most anterior two are confluent (Hill, 1898, p. 341). 



2. ) As far as its situation concerns, the common gill-pores correspond into the most 

 anterior pairs of the gill-pores in other species. 



3. ) Though this structure was described in some of the genera Ptychodera Eschscholtz 

 and Glossobalanus Spengel, in the member of the genus Balano ylossas Delle chiaje, it was 

 first recorded by Willey only in B. carnosa (Willey, 1899, p. 254.) 



4. ) From my own observation on the living specimens of this species, I may say the 

 vacuolation and bulging out of the epitherial cells lining the cavity of the hepatic saccules 

 and the gut cavity are not the result of the action of reagents as were supposed by certain 

 authors, but a normal physiological phenomenon accompanied with the secreting function 

 of the digestive fluid. 



5. ) The intersaecular involutions of the epidermis may be probably same with that of 

 Sftngdia alki described by Willey (Willey, 1899., p. 283.) 



