290 



From albatrossii it differs only in the colour, in the shape and size 

 of the ciliated funnels and in slight differences in the shape of the 

 calcareous deposits. 



Chiridota nanaimensis n. sp. 



Nanoose Bay. Nanaimo. 15. VI. 1915. Mud, stones. ca.25fms. 6specimens. 



The specimens at hand are but fore-ends, which do not measure 

 more than ca. 1 cm in length and 0,3 cm in diameter. The colour 

 of the body is in alcohol greyish-purple, and that of the tentacles 

 bright yellow. The body-wall is rather thick and quite intransparent. 

 There are 2 — 3 wheel-papillae in each interradius, and the papillae 

 are arranged in a single row in the middle of the interradii. There 

 are twelve tentacles, each with five pairs of digits. The calcareous 

 ring (Fig. 57. 11) is unusually stout, with deep muscular impress- 

 ions. The retractor-muscles are distinct and united to the body-wall 

 by a connective tissue. There are ca. 10 polian vesicles and a 

 single stone-canal. The madreporite (Fig. 57. 9-10) is characterized 

 by the irregular ring-shaped calcification. As the larger part of the 

 alimentary canal is wanting, the presence or absence of a loop on 

 the intestine cannot be ascertained. The mesenteries are well devel- 

 oped and supplied with ciliated funnels measuring ca. 1 50 ^ in length 

 (Fig. 57. 12). The funnels are not united into clusters, but they are 

 situated singly on the mesenteries, where they are irregularly ar- 

 ranged. The wheels are of the common shape and measure 50 — 

 70 [n in diameter. The miliary granules (Fig. 58. 1) are exceedingly 

 characteristic and are lying in a dense layer all over the body. They 

 are usually crescent-shaped and of very nearly the same size. The 

 rods in the tentacles (Fig. 58. 2) are larger. They are not so di- 

 stinctly curved and often bifid in the one or in both ends. The deposits 

 in the digits (Fig. 56. 3) are more or less irregularly shaped bodies. 



The gonads are weakly developed, but distinctly branched, and 

 the genital duct opens on a little wart-like papilla close behind 

 the dorsal tentacles. 



Chiridota nanaimensis is very characteristic and not more closely 

 related to any hitherto known species of the genus. The dense 

 layer of crescent-shaped rods recalls violacea Johs. Müller, but 

 the well developed mesenteries and the small ciliated funnels 

 separate it distinctly from that species. 



