80 



BI8ATO K I 'WAN U. 



square areas ; anus dorso-terminal. 1 (Fig. I.) 



Colour : — the ground colour is of an uniform ochre-yellow, proboscis 

 and collar groove are of faint yellow : in sexually immature animals, 

 genital pleura; are of a deep yellow while in the sexually matured they 

 are of dirty grey in female (clue to the colour of eggs) and of yellow in 

 male ; the hepatic region commences with a few of brick-red saccules 

 followed by many of dark brown saccules which arc again followed by a 

 number of large yellow saccules passing over into a long stretch of green 

 saccules. 



Measurement : {m mm.) 



Ooll. Brunch, reg. <ien. rey 



9 40 62 



Length 

 Width 



I'rol. 



7 

 <» 



Hep. rei;. 



140 



t'ami, reg. 



125 



Proboscis 



Total length ca. 400 mm. 

 Internal Structure. 

 The circular muscle layer is interrupted by the dorsal 

 insertion of the pericardium : longitudinal muscle fibres spring in the 

 proboscis wall near the bottom of each proboscis-canal and are inserted on 



the anterior portion of the wall, across the 

 circular muscle layer, with an attenuated high 

 retractile, difficultly staining terminal por- 

 tion, simple or branched; dorsoventral muscle- 

 plate extends beyond the front end of the 

 stomochord 2 ; ventral septum stops short 

 behind the anterior extremity of the stomo- 

 chord ; right dorsal proboscis-canal ends 

 blindly while the left opens to the exterior 

 through a proboscis-pore ; the parietal layer of the connective tissue 

 presents an alveolar structure' 1 (Fig. 2), while the splanchnic layer 



1. ) This is only case among known Euteropneusts. 



2. ) In tliis species I did not find any actual transition of fibres from the dorsal to the 

 ventral beyond the apex of the stomochord in accordance with the description of Glosso- 

 balanus hedlryi iiy Hill (189S, p. 335-336), and unlike that of Spengel, Delageand Hcronard. 

 (Spengel's Monograph, p. 460s Delarge and Hcrouard : Traité de /.oologie Concrète, p. 10.) 



Such a structure has not yet been described in any other species. 



Fig. 2. 



Alveolar structure of the connective 

 tUsuc in the proboscis oœlorji. 

 (-ja- inifn.X4)- 



