THE GEPHYREA OF JAPAN. 6*J 



single, appears as two vessels, which unite into one to communi- 

 cate with the ventral vessel. There are two long anal glands, 

 the anterior ends of w^hich extend to the middle of the body ; 

 a few fine muscular strands join their posterior portions to the 

 body-wall. The ciliated funnels of these glands are small, their 

 stalks being very short. No rectal gland is present. 



This species seems to be closely allied to both Thalassema 

 vegrande Lampert and T. Mœbii Greeff, as judged from the 

 agreement in internal structure, but it may readily be dis- 

 tinguished from either. Unlike the present species, 2\ vegrande 

 is said to be without proboscis and also without funnels on the 

 anal glands. Of the proboscis, Shipley (32) says : " Like 

 Lampert I had only a single specimen, and, like his, mine 

 had no proboscis. There was no trace of one and no scar to 

 indicate that there had ever been one, and I am inclined to 

 think that this species may be without a proboscis." 



In contrast with Thcdassema 3Iœbii the present species 

 exhibits considerable difference in external features as a com- 

 parison of Greeff's (14) figure of the former with mine of the 

 latter (Fig. 20) will show. The difierences mostly concern the 

 size, form and coloration of the proboscis as well as of tlie 

 body proper. 



THALASSEMA FUSCUM, n. sp. 

 (Figs. 21 & 99). 



In external features the present species closely resembles 

 Thalassemia mticosum, except in color. The long cylindrical 

 body proper is about 7.5 C7u. long and 15-18 mm. thick, while 



