KCHIXOIIMvA. I. 



179 



the museum of Paris called Sir. gibbosus Val. (I. Galapagos. M. Rousseau. 1846). They are Sp/icrr- 

 i-rhhnix granultiris (or, if they be really from Galapagos, another >b)>//(7'rcv7//>///.v-species (australial}}. On 

 the back of the label is written < achete a Londres thus the locality cannot be regarded as reliable. 



Paraci'iitrotns Gaimnrdi (p. 124). On a specimen of this species in the museum of Paris (the 

 type specimen of Ech. aciculatus Hupe, which is a synonym of Gaimardi] I have found a small triden- 

 tate pedicellaria; it was somewhat broken, but showed nevertheless sufficiently that it is similar to 

 those of P. lividus, so that a specific character is scarcely to be found in it. 



Anthocidaris homalostoma (p. 125). The type specimens of Ech. homalostoma Val. are two naked 

 tests that are really very similar to Anthocidaris; but it cannot be decided by the naked tests whether 

 they are the same species. The locality (New Zealand) tells against the identity. I have above (loc. 

 cit.) said that the name of homalostoma would have to be used whether they be identical or not. 

 According to the opinion of Doderlein expressed to me, this is incorrect, and I shall readily submit 

 to his authority. Then the species will get the name of Anthocidaris crassispina (Ag.). 



Strongylocentrotus nudus (pp. 126, 140). A specimen of this species (from Hakodadi -- Japan) 

 I have examined in Strassburg. No globiferous pedicellarise were found on it, but the spicnles show 

 it to be a genuine Strongylocentrotus. The tridentate pedicellarise occur in three different forms, as 

 in drobachiensis\ a short, broad one (i - 5 mra ) resembling that figured on PI. XX. Fig. 20; a long, narrow 

 one (2 mm ) resembling that figured on PI. XX. Fig. 6, only more serrate below; and finally a small one 

 (ca. 0'5 mm ), more particularly corresponding to the third form in drobachiensis (PI. XX. Fig. 4); it is simply 

 leaf-shaped with quite straight edge, without marked indentations. The other pedicellarise show no 

 peculiarities. 



Strongylocentrotus incxicauus (pp. 126, 140). The specimens from Chili mentioned by Sluiter 

 (371), are Echinometrids but whether they be really Str. mexicamts, is perhaps not quite sure, so 

 the systematic position of this species must continue to be regarded as doubtful. 



Echinus clegans (p. 145). The specimens from Cape Verd (<Gazelle) noted by Studer as Ech. 

 clegansf, are two small naked tests; one is doubtless Genocidaris maculata, the other I suppose to be 

 a Par echinus, but it cannot be decided with certainty. 



Echinus a/finis (p. 152). For this species I can add one more locality, having found in the 

 museum of Paris some specimens from 3938' N. L,. 7O56'W. L. 1241 fathoms (Blake); they were 

 called Ech. norvegicus. 



Echinus acutus, var. norvegicus (p. 155). Some small specimens from the Faroe Channel 

 (Michael Sars^> 150217 fathoms, Ad. S. Jensen) have a primary tubercle on all the ambulacral plates 

 and upon the whole in regular series; they are only irregular as to size, especially a few ones at the 

 ambitus being disproportionately large. Upon the whole the ambulacral areas have here quite the 

 same appearance as in some specimens of Ech. affinis. They are then to be distinguished from this 

 species by the colour and the globiferous pedicellarise, the latter having in affinis 2 2 (more rarely 

 2 3) lateral teeth, while in norvegicus they have i i or 1 2 lateral teeth. The tridentate pedicellarioe 

 of the two species are so similar, that no distinguishing character can be found in this feature. On 

 the other hand the spicules of the stalk of the pedicellariae is a good character of norvegicus -- when 

 they are found, but they are no constant feature. -- Evidently Ech. affinis is more particularly allied 



23* 



