ACTINOPODOUS HOLOTHUKIOIDEA. 



245 



bushy and unbranched. They spring from a point nearly half- 

 way back in the body length. As in Cucumaria frondosa, there 

 is one extremely long Polian vesicle, which in one specimen I 

 have found to be 14 cm. long, being longer than the body itself. 

 The madreporic body is rather large and globular. La^^ipert 

 states that in the specimens from Georgia, he saw an enormous 

 number of small, 1 mm. long vesicles attached to the ring-canal. 

 I do not find such vesicles in my specimens. 



One of the characteristic points of this species, as brought 

 out by Sempee, is that there are large, radially placed calcareous 

 plates near the cloacal opening. Clark says these plates are not 

 at all noticeable in the Alaskan specimens. Neither can I find 

 them in my specimens. Calcareous bodies 

 found in the skin are very much like 

 those depicted by Semper in his Fig. 18, 

 Taf. XXXIX. They are irregular latticed 

 plates with serrated margin and more or 

 less beset with knobs {li). Their size varies 

 from 0.192 to 0.280 mm. They show a 

 tendency to be less broad at one end than 

 at the other. In large specimens, they 

 are apt to be very sparsely scattered, so 

 that they may often be overlooked. AVhat 

 Theel says in regard to the calcareous 

 plates of C. frondosa seems to be largely 

 true in this species also ; in fact the 

 irregularly formed plates with uneven or 

 spinous margin are as a rule rare in the cuc..nJirt^ „_cai- 

 old specimens, and are usuallv found only '^'''^^'^^ ™^^'' ^—Perforated pMeof 



. ^ J perisome. x 240. I -Interratlialia ; 



m the pedicels or in their neighborhocd. R-Radiaim. 





