ECHINOIDEA. I. 121 



trottis. In our museum is found a snuill Rcliinid from Jai>an, received from tlie nmseum in \'ienna 

 under the name of Sfr. /iifrnnrdhis; this determination is scarcely correct, but it miy;ht a«;ree with the 

 description of cJilorocoitrotits. At all events it is another sjiccics than that of de Loriol; it has four 

 pairs of pores, while Brandt gives 5 pairs. (That of de Loriol has 7—5 pairsi. In this specimen the 

 o-lobiferous pedicellarise are as in drobachicnsis; but the sjncules are simple, bihamate. Nothing definite 

 can be said of Str. chloroccntrotiis, until the t\-pe specimen has been reexamined. 



To the species here mentioned, esi^ecially iiitcrmedhts and chloroccntrotus (?) has to be added 

 aSpharcchinnS' pulcherrivms^ of which I have received a couple of specimens from Prof. Doderlein; 

 some specimens of this species were further found among some Echinids from Japan, which Prof. 

 d'Arcy Thompson has sent me for examination. Of this species I .shall give the following informa- 

 tions. A primar\- tubercle is found on all the ambulacral plates (as in all the preceding species and, 

 as far as I know, in all polypore species). Onl\- four pairs of pores in each arc, as in intcrviedius and 

 chloroccntrotus (mentioned by Agassiz). Three ocular plates reach to the periproct. The buccal mem- 

 brane is highly pigmented, with numerous .small fenestrated plates, some few of those outside the buccal 

 plates thick, with pedicellarise. The globiferous jDedicellarias cpiite as in drobachiensis\ of tridentate 

 pedicellarice a larger form is found (PI. XX. Fig. 10), a little widened at the point and with rather 

 sinuate edge, and a smaller form, where the edge is straight or only ver\- slightly sinuate. The other 

 pedicellarise show no peculiarities. The spicules are bihamate, not branched. 



As none of the other species referred to Strongylocnitrotiis — and, upon the whole, no other 

 Echinids of ■..TriplechinidcB- and ' Echinovictradcr that I know, with the exception of the. Ant/iocidaris 

 hovialostoma Ltk. mentioned below — have the same peculiar form of globiferous pedicellarise, it is 

 evident that the mentioned species form a separate group, while it is a less sure fact whether the>- 

 form also one genus. The species pulclicrrimus, intcniu-diits, and chloroccntrotus (?) are distingui.shed 

 froni the others by having simple bihamate spicules, onh' four pairs of pores in each arc, and by the 

 ver\- flat form of the test; in all of them the spines are very short, the primary ones very little con- 

 spicuous, also the primary tubercles are onh" little conspicuous among the numerous secondary 

 tubercles arranged in horizontal series. I am most inclined to interpret these species as a particular 

 genus (thev form, perhaps, even only one species), which genus, if the mentioned specimen should 

 really prove to be identical with Brandt's Str. chloroccntrotus., must get the name of Strongyloccntrotus. 

 The other species: drobachicnsis, purpiiratus^ v,\\^ franciscamis, would then have to form a separate 

 genus, which, if the name of Strongyloccntrotus is to be restricted to the above named species, must 

 get the name of Eurycchinus Yerrill'). As long as we have no sufficient knowledge of the species 

 that has to be called Strongyloccntrotus, viz. chloroccntrotus Br., it will be most correct to call all the 

 species mentioned here Strongyloccntrotus, and leave the name of Eziryechinus for disposal, if it should 

 prove to be necessary to use it. 



Strongylocentrotus depresses (Ag.). Of this species I have received a specimen from Prof. 

 Doderlein, and another specimen I have found among the Echinids from Japan sent me for deter- 

 mination by Prof. d'Arcy Thompson. Accordingly I am able to give some informations of it, which 



I) E. A. Verrill: On the Polyps and Corals of Panama, with descriptions of new species. Proc. Boston Soc. Nat. 

 Hist. X. 1866. p. 340. 



The Ingolf-Expedition. IV. i. I" 



