108 SVEN* LOVKN, ON THE ECHINOIDEA DESCRIBED BY LINN.-EUS. 



allied species of its own type on thc Paciiic sidc. They re- 

 semble eacli otlier in general appearance and colonving, in 

 tlie lengtli of their aciculate spines and the extension of tlie 

 terminal crustiile of the ventral ones. The A. puuctulata is 

 the true Atlantic representative of the type developed on the 

 Paciiic side, jnst as the A. grandinosa is the representative on 

 that side of the type prevailing in the Atlantic. Th^ appella- 

 tion punctulata, alluding to the epistroma of the interradial 

 disk, has been sauctioned by tradition for this Atlantic form, 

 now ascertained by Al. Agassiz to be distributed from Yu- 

 catan to Long Island Sound. From Lamärck's description the 

 species is hardly to be recognised, and even less so from his 

 referring to the specimen from the Bight of Guinea in Seba, 

 1. 10, f. 10 a, 6, which, aftcr all, present none but generic cha- 

 racters. It seems to have been traced out on accoimt of thc 

 doubtfully alleged figure JJ on Klein's Pl. XI, afterwards, 

 however, referred by Lamarck to his E. pustnlosus. No doubt 

 that ligure somewhat recalls the A. punctulata of authors, 

 and is quoted for it by Troschel from the French edition of 

 Klein's vvork. but sthe small mouth» expressiv noticed by 

 Klein hardly adraits of au identitication, the less so as in 

 that species the stoma is fully as large as in any other mem- 

 ber of the genus. It is also not to be overlookcd that the 

 original of the ii o-. D was not in Klein's own collcction but 

 belonged to the »Thesaurus Regius» at Dresden, from whence 

 Leske afterwards had it for comparison^). The speciraens of 

 the A. punctulata Lamck., therefore, of the Erlangen Museum, 

 which Troschel described, and which are now before me, 

 may have once been in the possessiou of Klein, but none of 

 them can have served as an oriainal to the lio-. I). Consc- 

 quently this ligure must be set aside for the present. 



Among the names in i^se within this o-enus thc two fol- 

 lowing ought to disappear. 



The name of »pustulosa», taken from Klein, was given 

 by Leske and Troschel to the Arbacia Lixula L., by Lamarck 

 and Blainville to some form not to be made out now, by 

 Desmoulins in 1837 to the Echinocidaris nigra ]\Iol., in 1869 

 to the Arbacia grandinosa Val., and by Agassiz and Desor 



') Addit. p. 152. Professor H. B. Geinitz writes me that, if still ex- 

 tant in 1849, they were destroyed when the wing of the »Zwinger» was 

 biirnt down, which contained the zoological collections. 



