li HINOIDEA. I. 



171 



corners are less conspicuous or even not indicated at all. The mouth may also be somewhat shorter, 

 so that the whole valve reminds of the form peculiar of the genus Cidaris. The small globiferous 

 pedicellarirc (Fig. 8) are of a quite different form, flat and broad, the lower limit little conspicuous; they 

 are also very varying in size, and the larger specimens are very similar to tridentate pedicellariaj. Real 

 tridentate pedieellarire I have not found. The spicules of the common form. This species, no doubt, 

 is to be referred to the genus Stereocidaris; I propose the name of St. Lorioli n. sp. 



The specimens from Chall. st. 24 (Culebra Island) and from Gomera (The Canary Islands) I 

 have not seen — thev are not found in British Museum — and so I can give no informations of them. 

 Of the specimen of D. papillata mentioned by Studer (386), from 4° 40' N. L,. 9° 10' E. E, 59 

 fathoms (the Gazelle -Expedition) (the mentioned locality is not, as Studer says, the Cape Verd 

 Islands, but quite innermost in the Gulf of Guinea) I have (pp. 35, 37) expressed the supposition that 

 it might be Cidaris affinis. This is not correct; it is a new Dorocidaris-species, very different from D. papil- 

 lata as to habitus. The secondary spines are rather few, and, with the exception of the primary series 

 in the ambulacral areas and a single circle round each radiole, very small, by which fact the whole 

 test, but specially the apical area, gets a strikingly naked appearance. In the ambulacral areas a 

 double series of spines is found in the median line, so small, that they do not reach to the base of those 

 in the primary series. No vampulke seem to be found. The secondary spines are reddish brown; 

 according to Studer they are purple (on living individuals?); the colour of the test white. The radioles 

 are likewise reddish brown, but of a lighter shade than the secondary spines; they are about i'/ 2 — 2 

 times as long as the diameter of the test, only a little tapering towards the point, ending in a little 

 widening. There are ca. 9— n more or less coarsely serrate, rather conspicuous longitudinal ridges; 

 the ; hairs on the outer layer between the longitudinal ridges as in D. papillata, so that a transverse 

 section of the spines gives the same picture as in the latter species. The actinal radioles not much 

 serrate in the edge, upon the whole only little different from the others, excepting with regard to the 

 length. The areoles comparatively very large, but not especially deep; they occupy almost the whole 

 space, so that there is only room left for a few secondary spines outside of the single circle nearest 

 to the radiole. No naked median line in the interambulacral areas or between the plates; no trans- 

 verse furrows in the edge of the interambulacral areas as in papillata. The inner tubercles in the 

 ambulacral areas are placed opposite to or a little below those in the primary series. — The mouth 

 of the large globiferous pedicellariae (Fig. 9) is regularly limited below, often by a straight line; it is 

 surrounded by rather strong teeth. The dorsal side of the blade is less highly perforated than in 

 D. papillata; the small globiferous pedicellariae as in this species. The tridentate pedicellarise are not 

 so irregularly serrate in the edge and upon the whole less complicate in the lower part of the blade 

 than in I>. papillata. The spicules as in papillata and arranged as in this species. -- This species, for 

 which I propose the name of Dorocidaris nuda n. sp., I have also found in the museum of Paris, from 

 Talisman , st. 109, 70 m., and st. no, 450 m., near Cape Verd, called Dorocid. hystrix, by which name 

 it has been mentioned by Bernard (78). 



It is still to be noted that the specimen of D. papillata mentioned in Rev. of Ech. p. 105, from 

 Guadeloupe (Duchassaing), does not belong to this species; it is a Cidaris sp., probably C. affinis. 



Thus I have established the fact that no less than 8 different species, of which, moreover, only 



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