CONOLAMPAS SIGSBEI. 49 



of the distance from the apex to the ambitus, forming the rudimentary 

 petaloid ambulacra At the extremity of these petals, the porea suddenly 

 come close together, the poriferous /ones becoming extremely narrow, and 

 continue thus narrowed to the ambitus, and over to the actinal side, until 

 they meel the floscelles. The anal system is covered by an outer row of 

 three large plates and one smaller one. with a l'ew smaller plates closing the 

 outer edge of the anal system. 



It was with considerable hesitation thai I referred this species, when first 

 described, to the genus Conoclypus. While it undoubtedly agreed with it in 

 having a central apical system, a high conical test, ami the live ambulacra 

 of the abactinal side equally developed, yet the arrangemeni of the pores 



I PI. XVII. Fig. 7 I and the development of the phyllodes and of the holirrelets 

 (PI. XVII Fig. 5), the transversely elliptical anal system | PI. XVII. Fig I 

 ami the structure of the apical system (PI. XVII. Fig. 3), seemed to ally 

 it more closely to Echinolampas. From the latter genus it differed, how- 

 ever, in the arrangemeni of the petaloid ambulacra, which do not form open 

 petals as in the species of Echinolampas thus far known, but merely straight 

 poriferous zones, not furrowed (PI. XVII. Fig. 2), extending close to the 

 ambitus. This feature alone would perhaps seem insufficient as a generic 

 distinction, for we find in E. depressa of Gray that the ambulacral petals are 

 modified somewhat from the characteristic Echinolampas type (A', oviformis), 

 and besides not having closed petals, the poriferous zones of the different 

 ambulacra are all of unequal length, somewhat as in /•;. Alexandri De Lor. 

 (see PI. XVI. Fig. 1 ), one of the characters by which Prof. F. J. Bell 1 

 attempted to separate the genus Palaeolampas from Echinolampas. De 



Loriol t is of opinion that the characters on which .Mr. Bell attempts to 



establish the genus Palaeolampas are insufficient, yel we may find it con- 

 venient from the -neat variation we find in the petaloid areas of Echino- 

 lampas to adopt Palaeolampas as a subgeneric t\ pe.J 



Zittel was the firs! to show, in his Eandbuch '/<>• Palceontohgie (I. 515), 

 that some species of the gen us Conoclypus possessed teeth. This led De 



Loriol to make an examination of this genus, and he found that it really 



contained two generic types, one with phyllodes, which was edentate, and 

 another in which there is no trace of phyllodes, hut an enormous develop- 

 ment of the bourrelets, which is provided with teeth, for the firs! type 



• |v ■/, | -• „ i, ,. i in, i^ii. p. 43. X S< 



+ M, m. de la Soc. de Pbj el d'HisI ' , SXVIL 88. 



