118 
secured by the unaided labours of Mr. Gad, and comparing it with 
the species given in Dr. Hartlaub's monograph on East Indian 
comatulids in general... The fauna of Japan, much the best known 
of any, contains 75 species, but of these only 19 belong to genera 
at present known at Singapore, while of this number only 13 are 
littoral. It must be remembered that, whereas a very considerable 
amount of work has been done on the crinoids of the deeper waters 
about Japan, we as yet know nothing about those off Singapore, 
so that a direct comparison of the records from each locality would 
appear to indicate a much greater 'Tichness for the former, which 
is undoubtedly far from being the truth. 
There is a possibility, though, it must be admitted, extremely 
remote, of a seasonal migration taking place among the littoral 
comatulids of the East Indies, comparable to the well known 
migrations to and from deep water of the Asteroidea in certain 
parts of the world. In order that data may be accumulated, and 
the question soon set at rest, I have given, in every case where 
it: was recorded, the date upon which capture took place”). 
The dates of capture are of interest apart from the possibility 
of a seasonal migration. It frequéntly happens that erinoids are 
reported as aåbundant at a certain locality, yet one may go to the 
exact spot and find mo trace of them; for some réason or other 
they have quite disappeared. The history of Némaster iowensis is 
a good example of this. Professor C. C. Nutting of the University 
of Iowa, while on a visit to the Dry Tortugas, found two specimens 
in three feét of water on a reef which, though previously searched, 
had never yielded any crinoids; the most exhaustive investigation 
of the whole locality has since failed to reveal a trace of' any 
others.” All the specimens, regaårdless of species, in this collection 
taken at Singapore are comparatively "small, and apparently "not 
quite mature, and all seem to be in precisely the same stage of 
development. It is quite possible that the particular spots where 
they were taken have been only recently colonized by crinoids, all 
"1)/CE Note at the end of the paper 
HE ENES BRS sy Eg FØRE REE SEET SER 
SES EOSSEE DENE SE SNE sb SENER RES Sme se ere Eem Kr sr RENSE NE SE 
