. Echinoidea . Fig. r I. Part of actinal plastron of Pourtalesia phialc. Fig. 12. Part of actinal plastron of Pourlalesia carinata after Loven. 1 De Meijere (Siboga Echin. PI. XXI. 41S p. 168) represents Echinocrepis cuneata as ha\-ing the same strncture of the bivial ambulacra, founJing his opinion on PI. XXXV. a. lo of the Challenger»-Ech. Echinocrcpis setigera has its bivial ambulacra separated bj- the interambulacra i and 4 (Panamic Deep-Sea Echini. PI. 67. i, Fig. 167). Also the apical system is very different in these two species, compact in Ech. ctaieata, disconnected in Ech. .letigera.
. Echinoidea . Fig. r I. Part of actinal plastron of Pourtalesia phialc. Fig. 12. Part of actinal plastron of Pourlalesia carinata after Loven. 1 De Meijere (Siboga Echin. PI. XXI. 41S p. 168) represents Echinocrepis cuneata as ha\-ing the same strncture of the bivial ambulacra, founJing his opinion on PI. XXXV. a. lo of the Challenger»-Ech. Echinocrcpis setigera has its bivial ambulacra separated bj- the interambulacra i and 4 (Panamic Deep-Sea Echini. PI. 67. i, Fig. 167). Also the apical system is very different in these two species, compact in Ech. ctaieata, disconnected in Ech. .letigera. It- can then scarcely be doubted that the latter-species was unrightl)- referred to the genus Echinocrcpis and will have to be made the type of a new genus. I Comp. Iielow p. 83 — - It is of course, the fragmentary condition of his material of this species which has caused that interpretation. Not knowing the real structure of P. phialc. Loven could scarcely interpret these piates in P. carinata otherwise.
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1903
