Verrill, JSfotes on JRddlata. 805 



but rather to the genus, Toxocidaris of A. Agassiz, where he had 

 ah-eady placed it. 



The reasons for not adopting the name, Toxoj.neustes, for this group, 

 are these : 



1st. ^Yhen this name wsi^ first pr<>2yosed '■'■ EchhiKS loileolus"' ^sl^ 

 mentioned, without descrijjtion or reference, as its type, (Monog. Ech., 

 2"*^ liv., p. 7). 



2nd. Wlien next mentioned and first described, J^chinus tubercida- 

 tus Lamarck was given as its type, and the description applies to 

 such species as are now named Toxocidaris by A. Agassiz, (Monog. 

 Ech., 4"'e liv., p. ix). 



3rd. In the work last named the typical species of EuryecMnus 

 were described under Echinus proper, as restricted by the removal 

 of Tripneustes, Toxopneustes, etc., and therefore were evidently not 

 regarded as belonging to the latter genus. 



4th. In a work published five years later (Catal. Rais.) Toxop- 

 neustes was placed as a sub-genus of Echinus, and a variety of forms 

 were referred to it, amounting to thirteen nominal species, among 

 wliich are several types now regarded as generically distinct. Of 

 these species the 1st, 2nd, and 4th are now placed in the genus 

 Sphmrechinus Desor; the 3rd, 5th, Vth, and 10th belong to Euryech- 

 inus; while the 8th {T. Delalandii) and Oth {E. tubercidatus) are true 

 Toxopneustes, now referred to Toxocidaris by A. Agassiz ; the 6th, 

 11th, 12th, and 13tli are doubtful species, the last fossil. 



It is, therefore, evident that if Toxopneustes be taken in its original 

 sense, ichen first described, it must be restricted to that group having 

 T. tubercidatus as its type, a group apparently equivalent to Toxo- 

 cidaris A. Agassiz, which is represented by several East Indian and 

 Pacific Ocean species, as well as by two species ujion the Pacific coast 

 of N. America {T. mexicana and 2\ franciscana). These species have 

 the characters originally assigned to Toxopneustes in an eminent 

 degree, while to E. pileolus, as now understood, neither the name 

 nor description would apply. Therefore there seems to be grave 

 objections against restricting it to the latter species, and its allies, 

 even were it certain that the species now known as Boletla pileolus, 

 was the one referred to as Echinus pileolus, without authority. 



Euryechinus imbecillis VerrUi. 



1 Echinus gibhosus Val. MS. ; ? Echinus (Toxopneustes) gibbosus Agassiz, Catal. Rais. 

 Euryechinus gihlosus Yerrill, Proc. Boston Soc. Nat. Hist, x, p. 341, 1866. 



This species was found thrown upon the beach abundantly at Cal- 

 lao and Paita, Peru, by Mr. Bradley. At the latter locality living 



