REPORT ON THE C'RINOIDEA. 321 



respectively differ somewhat in their characters, and I was at first inclined to regard 

 them as specifically distinct ; but they are linked together by another form from 

 Singapore, which was kindly given to me by my friend Professor Charles Stewart. 



I cannot separate these three specimens from the type which was described by Bell 

 as Actinometra coppvngeri} It is represented by a single individual with twelve arms, 

 owing to the presence of two distichal axillaries ; and as one of these is clearly due to 

 regeneration at the syzygy in the third joint above the radial axillary, Bell was to a 

 certain extent justified in saying that the normal number of arms " is probably ten." 

 The epizygal of this syzygy may, however, have been an axillary originally, and the 

 second axillary, which is figured by Bell, is so well developed that I believe it to be a 

 normal one. Furthermore, in all the four arms borne upon these two distichal axillaries, 

 whether regenerated or not, the first brachial bears a pinnule, and the second is a 

 syzygial joint. These characters escaped the notice of Bell, whose figure is incorrect, 

 as it shows a pinnule on the second brachial and a syzygy in the third joint above the 

 distichal axillary. On the strength of this figure I assigned a place to Actinometra 

 coppingeri in the Parvicirra-group, and gave a different name to the Challenger species. 

 But when I came to examine Bell's type for the purpose of determining its relations to 

 Actinometra parvicirra, I was surprised to find it identical with the form which I had 

 been accustomed to call Actinometra steivarti ; so that it adds another to the list of 

 species which were dredged both by the " Alert" and by the Challenger. 



The arms are largest in the Challenger individual from Samboangan, but its cirri 

 are considerably smaller than in the other two, especially in that from Singapore, which 

 approaches it most nearly in the characters of the arms. The latter also has the longest 

 lower pinnules, and the terminal comb may extend to nearly the twentieth brachial ; while 

 it is rarely found after the eighth brachial in the Samboangan form which has twenty 

 arms. That from Singapore has eighteen, and the Banda one only fourteen, as three of 

 the rays have no distichals at all, and the first syzygy is therefore in its normal position 

 in the third brachial (PI. LX. fig. 2). 



The museums at Berlin and Copenhagen each contain a specimen which I believe 

 to belong to this type. There are not more than eighteen cirrus-joints, as in the examples 

 from Banda and Singapore ; though that from Samboangan may have twenty or twenty- 

 two. This limitation in the number of cirrus-joints in specimens from five different 

 localities seems to indicate that the type is not identical with Actinometra borneensi.s, 

 Grube, which has twenty-two to twenty-eight joints. 2 Grube also says of the arm-joints 

 " Die Glieder sind etwas klirzer als breit, und laufen nur anfangs in leichten Zick-Zack 

 weiterhin parallele." His type specimen has unfortunately disappeared. Professor 

 Schneider has been unable to find it at Breslau, and it is equally unknown at Berlin, 



1 "Alert" Report, p. 168, pi. xvi. fig. B. 



2 53e Jahresber. der Schlesisch. Gesellsch. f. Voted. Cult, 1875, p. 75. 



(ZOOL. CHALL. EXP. —PART LX. — 1888.) OoO 41 



