252 THE VOYAGE OF H.M.S. CHALLENGER. 



necting link between Antedon lusitanica and the Caribbean species (Antedon. granulifera, 

 Antedon spinifera, &c.) of the North Atlantic, and Antedon bispinosa of the Southern 

 Ocean. 



9. The Savignyi-gvou-p. 



Bidistichate species with an unplated ■ disk and no definite ambulacra! skeleton ; the 

 bases of the rays are not flattened laterally. 



Remarks. — I have associated this group with the name of Savigny, as its earliest 

 described representative was brought by him from the Red Sea and named after him by 

 Midler ; while it is one of those which appear both with and without palmar series, and it 

 therefore has a wide range of alliances. It also occurs at Muscat and at Kurrachee, but 

 is not known to extend further eastwards. 



Antedon reynaudl has been described from Ceylon, and I have seen some undescribed 

 species from Zanzibar in the continental museums. But all the remaining types of the 

 group belong to the littoral fauna of the eastern seas from Japan to Sydney, with the 

 exception of Antedon angustiradia, which was found by the Challenger at 140 fathoms 

 in the Arafura Sea (Station 192). 



Some forms of this group have no palmars above the distichals ; while in others there 

 are palmar series, consisting sometimes of two and sometimes of three joints. I have not 

 thought it necessary, however, to separate these latter species as a distinct group. They 

 all belong to the same general tridistichate type, and may be classified as follows : — 



A. Three distichals, not succeeded by palmars. 



I. The centro-dorsal bears ten vertical rows of cirri with sixty or seventy 



joints. The distichal pinnule longer than its successors, . .1. angustiradia, n. sp. 



II. Not more than forty-five joints in the cirri, which are without definite 

 arrangement. The distal pinnule generally smaller than its suc- 

 cessors. 



a. The joints of the lower pinnules without lateral processes. 



1. Forty to forty-five cirrus-joints, which are mostly spiny ; 



usual syzygial interval seven to ten joints, . . reynaudi, Mull., sp. 



2. Twenty-five to thirty-five cirrus-joints ; usual syzygial 



interval three to seven joints. 



a. Twenty-five to thirty cirri with strong spines on 

 the later joints ; second syzygy about the 

 eighteenth brachial. Distichals always present 



and sometimes palmars, . . . savignyi, Mull., sp. 



(Z. Twenty cirri, the later joints not spinous ; second 

 syzygy not beyond the fourteenth brachial. 

 Distichals sometimes absent, . . .2. amoqps} n. sp. 



b. The joints of the lower pinnules have lateral processes at their 



ends, . . . . . . .3. variij)iniia, 1 Carpenter. 



1 These species may have only ten arms ; see p. 194. 



