268 



end of the plates is irregular, but usually nearly oval. The holes 

 are distinctly toothed and in the middle of the plates, as well as 

 in the articular end, there is a rather thick network. 



There is only found one sort of miliary granules (Fig. 50. 4). 

 They are 10 — 20 ^ long, smooth, oval bodies, equally destributed 

 all over the body-wall. 



Protankyra suensoni is not more closely related to any of the 

 other species. It is distinctly characterized by the shape of the 

 calcareous deposits, especially of the anchor-arms and of the anchor- 

 plates and the ciliated funnels. 



Protankyra javaensis n. sp. 



The Java Sea, 5° 51' S., 106° 27' E. 7. VIII. 1922. Mud. 60 m. 1 specimen. 



The single specimen at hand is but a "head"-less fragment, 

 measuring 6,5 cm in length and 0,8 cm in diameter. As the an- 

 terior loop of the intestine is present, the comple e specimen can 

 not have been more than 8 — 10 cm in length. The colqur is in 

 alcohol very pale reddish, for which reason the specimen in the 

 exterior may resemble rodea (Sluiter). The mesenteries are close 

 to the body-wall net-formed and supplied with ciliated funnels (Fig. 

 50. 11). The funnels are placed singly and as far as can be seen 

 not united into clusters. 



The calcareous deposits are in this species exceedingly interest- 

 ing, the anterior ones being the larger. In most Synaptids it is a 

 rule that the anchor-plates from the posterior end of body are the 

 larger, and only the genus Patinapta is characterized in having the 

 larger plates in the anterior end of body, but even in this genus the 

 posterior anchors are the largest. Quite contrary to this, the single frag- 

 ment of javaensis has the largest deposits in the anterior end. The 

 suggestion lies at hand that the two ends of the specimen are con- 

 founded, but the well preserved rectum, anus and posteriormost part 

 of body-wall, show that this cannot be the fact. The not fully devel- 

 oped stage of the anterior deposits indicates that the specimen is 

 regenerating the anterior end, but even in this case I cannot see 

 any reason for the anterior deposits to be the larger. 



The largest anchor-plates (Fig. 51. 4) measure ca. 900 ^ in 

 length and 650 ^ in width. They are never fully developed, and 



