135 



somewhat erect and very long, 

 poslerolalt'ial rods are strongly t 

 canalifulaU'. 



Species a. (PI. XXI, Fig. 1). 

 of the body is soniewhal uiuisua 

 ionally high, Ihechslance 

 to the anterior edge being 

 the postoral band to the 

 preoral band is some- 

 the middle. The postero- 

 the body length, the 

 than body length; the 

 ly longer than the post- 



much longer than the inner arms; the 

 hornv along the inner side, more or less 



The body length is 0. 1 mm. The shape 

 1 through the frontal area being except- 

 from the preoral ciliated band 

 about half the distance from 

 - posterior end of the body. The 

 what downwards produced in 

 lateral arms arc ca. five times 

 other arms only a little more 

 anterolateral arms are distinct- 

 oral and posterodorsal arms. 



Fig. 61. Skeleton of Uiihwpluleus costalus, a. -»%. a. accessory rod: al. anterolateral rod; 

 b. body rod: dm. dorsal median process; e. end rod; pd. posterodorsal; pi. posterolateral; 

 po. postoral; pr. prcoriil rod: r. ri'iurrent rod; tr. transverse rod: vm. ventral median process. 



There appears lo be no swelling at the point of llu' arms. Pigmentation 

 unknown. 



Skeleton (Fig. <il). The body skeleton is fairly robust. The transverse 

 rods are short and thick; from one of them ])roceed on the ventral side a 

 short, pointed median process, and on the dorsal side a iniicli longer, simple 

 rod. the dorsal median process. A smaller i)rocess is directed backwards, 

 with a small side branch near the end; there is one both on the ventral 

 and on the dorsal side. The end rods are short. Irilid. The posterolateral 

 rods are set with thorns along their inner sides; they are peculiar in having 

 what looks like a narrow canal in the lower part, reaching from the fh-st 

 thorn until about the middle, where it ends with a small swelling in one 

 (the right) arm, while in the left arm it passes some way beyond this point 



