287 



in some of the specimens they are seemingly wanting on the mid- 

 dorsal mesentery, though they are abundant on the two other me- 

 senteries. The gonads are branched several times. The genital 

 porus is found on a little papilla close behind the dorsal tentacles. 

 The sexes are separate. The calcareous deposits in the complete 

 specimens from Nanaimo are nearly quite dissolved by acidity of 

 the preserving-fluid, and only their size can be ascertained. The 

 diameter of the nearly dissolved wheels is 60 — 120 ^. All the 

 other specimens have nicely preserved deposits. The wheels meas- 

 ure also here 60 — 1 20 ^ in diameter. There are only few rods 

 in the skin, and in the larger part of the specimens they are al- 

 most confined to the dorsal side, where they are often found in 

 small groups. The ends of the rods (Fig. 56. 9) are usually 

 branched and often bifid. Those in the papillae (Fig. 56. 10) are 

 more branched than those scattered in the skin. The rods in the 

 digits (Fig. 56. 12) are distinctly different from those in the ten- 

 tacle-stem (Fig. 56. 11) being smaller and thinner. 



Ch. albatrossii is recorded from numerous of the Albatross's 

 stations, and appears to be widely distributed in the northern part 

 of the Pacific Ocean, where it occurs in depths from 25 — 400 fms. 

 It is in several characters rather like lœvis (Fabricius) and may be 

 regarded as the pacific representative of this species. It is as a rule 

 distinctly different from it in having rods in the skin, but as the 

 rods in some of the specimens at hand are very scarce, and Oh- 

 shima even states that rods may be entirely wanting, the two 

 species may then be confounded. Still it is seen in the figures that 

 the shape of the calcareous ring, the madreporite and the ciliated 

 funnels afford so valuable characters for separating the two species, 

 that they may be easily distinguished from each other. 



Chiridota pacifica n. sp. 



La Jolla. 22. VIII. 1915. Soft bottom. 90— 100 fms. 55 fragments. 



The real length of the species cannot be ascertained, as only 

 fragments are at hand, but as the longest anal-end measures ca. 15 

 cm and the shortest fore-end measures ca. 3 cm, the length of the 

 species may be ca. 20 cm. The colour is in alcohol pale brown, but 

 different in the two ends of the specimen, as the fore-ends are 

 densely mottled with minute black spots. Such black spots are 



