172 ECIIINODERMA OF THE TNDIAN MuSEUM, PART VIT. 



0§ the Ganjam Coast; S-ld fathoms. — vSeven s|tocimens. 

 Arrakan Coast, Burma. — Two specimens. 



Snod Island. Mergul Archipelayo (12^ N. lat. , 98^° K. lont;.).— Three 

 specimens. 



Other Rkcords. — Tonga Islands; I'liilippinr Islmnls; M;i,cclesfield Bank; 

 iSingapore; Andai , New Guinea ; Ceylon. 



Depth.— Littoral, and down to 32 ('? 4(i) fathoms. 



Remarks. — When I was studying the crinoid collections belonging to tlie 

 Zoological Museum at Copenhagen I was unable to identify a pretty little species 

 of Oligometra from Singapore which was abundantly represented tlierein with any 

 species previously known, and [ therefore desci-ibed it as new under the name of 

 Oligoiaetra pnlchella, believing that the strongly rounded laterally flattened pro- 

 duction of the distal dorsal ends of the segments of the more or less styliform 

 lower pinnules amply served to distinguish it from 0. serripiiuiu, in which tlie 

 production of the distal ends of the pinnule segments is sharp. Tlie collections 

 of the Indian Museum contained thirty specimens resembling my 0. pidrheUa 

 from Singapore, except that the production of the pinnule segments is sharp. I 

 accordingly described tl\e supposed now form in MS. as Oligometra concinna. 

 Upon reviewing the subject more carefully, I found that tliis was at best only an 

 average difference, and that no definite line between 0. pnlchella and 0. concinna 

 could be drawn , and, further, that neither appeared to be separable from 0. 

 serri pinna, as redescribed by Hartlaub in ls<)l. It has seemed advisable there- 

 fore to relegate botii Oligometra pulc/wlla and Oligometra euncinna to the syno- 

 nymy of Oligometra serri^mrea, especially in view of the usually abundant differences 

 by which the species of Oligometra are distinguished inter ,se. 



A detailed description of typical Indian specimens may be of interest for 

 comparison with the form from Singapore which I called pulchella; the description 

 is based mainly upon an example from Puri, but is comprehensive enough to include 

 all the specimens except that from the Pedro Shoal, which has slightly more 

 numerous cirrus segments. The specimen from the lied Sea, which 1 examined 

 in the British Museum, and which was collected by the cable repair ship 

 " Electra" in 2o fathoms, represents an apparently well-marked variety which I 

 have called eleclrce, characterized by being exceptionally oi-nate, with extrava- 

 gantly developed processes on the proximal pinnules. 



Oligometra concinna. — Centrodorsal thin discoidal, tiie bare polar area flat, 

 2 ram. in diameter; cirrus sockets arranged in a single closely ciowded, but fairly 

 regular, marginal roM-. 



Cirri rather slender, proportionately short, XIll-XVTl, 19-21, s mm. long; 

 first segment very short, the following slowly increasing in length to the seventh 

 or eighth A\hich, with the remainfler, is as long as to half again as long as broad ; 

 proximal segments abruptly flattened ventrally ; on the fourth or fifth the distal 

 dorsal edge is slightly prominent, forming a low finely serrate transverse ridge 

 across the end of the segment; on the succeeding segments this ridge increases in 



