410 PROP. p. JBPFREY BELL ON THE [May 1, 



concerned Ophiocrene seems to show that some ancestor of this 

 group was provided with distinct radial shields, the presence or 

 absence of which is so variable a character in the Streptophiurse, 

 which I have, I think, shown to be ancestral to the Cladophiurse. 



Ophioceene \ 



An Ophiuroid with branching arms and the habit of an Astro- 

 phytid, but with calycinal plates on the disc, and roimded radial 

 shields of comparatively small size. 



Ophioceene enigma, sp. nov. (Plate XXVII. figs. 1-5.) 



As there is only one specimen, and that small, it is impossible to 

 say whether or no it is adult. It may be provisionally defined 

 thus : — Small, with delicate arms and few branches, of a milky- 

 white colour, the joints separated by fine brown lines. 



Macclesfield Bank, 45 fms. 



It may be pointed out that, at present, there is no evidence that 

 would justify us in regarding this as the young of some already 

 known Astrophytid of large size, but it is quite within the bounds 

 of possibility that a series of stages may show it to be so. 



V. ECHINOIDEA. 



Temnopleiteus bothetoides. 



Pleurechinus hothryoides, A. Agass. Chall. Eep. Ech. iii. p. 108 

 (1881). 



Temnopleurus hothryoides, Bell, Rep. Voy. 'Alert ' (188-4) p. 119. 



It is quite clear that this is by no means a rare species ; the 

 ' Challenger " and the ' Alert ' both brought home examples, and 

 the ' Egeria ' took it in at least four dredgings between 40 and 47 

 fathoms. In the smaUest specimen, which is not 4 mm. in 

 diameter, the deep and extensive pitting characteristic of the 

 species is quite well marked. 



I have a prett)^ strong conviction that the progress of research 

 will result in showing that Pleurechinus varioMlis and P. ruher of 

 Dr. Doderlein are synonyms of this variable species. 



TeMNOPLEUEUS EEYlfAXn)!. 



Temnopleurus reynaudi, Agass. 



An examination of two specimens covered with spines confirms 

 me in the view I expressed in 1880 ^ that T. reyncnidi and T. granu- 

 losus are distinct species. The examples now before me are some- 

 what larger than the spined specimens collected by H.M.S. 

 ' Challenger ; ' the spines are rather long, creamy white, with bands 

 of red, or with the free end red. 



^ As the •word Egeria has been seTeral times used in Zoology, and as Kprivq 

 means a fountain, and Egeria was, it is said, changed into a fountain by Diana, 

 I have, in this roundabout fashion, succeeded in associating H.M.S. ' Egeria' 

 with tliis interesting genus. 



^ P.Z.S. 1880, p.424. 



