ECHINARACHNKTS I'AK.ML 43 



Laganidse.* Among the specimens I have had occasion to examine 1 do 

 not find any marked difference due to age in the width of the marginal 

 edge which is occupied by the pillars. The structure of the test of the 

 Hat Clypeastroids shows that they are closely connected with Conoclypus, 

 the ambulacra] furrows and the teeth specially showing these groups to 

 have an intimate connection. Echinolampas, on the contrary, although 

 superficially more closely related, in reality differs more from Conoclypus 

 than do the fiat Clypeastroids. 



Clypeaster Ravenellii A. a 



Stolonoclypus Ravenellii A. A.;. Bull. M. C. Z., I. p. 265, 1869. 

 West Florida Bank. L4 fathoms. Yucatan Bank. 84 fathi 



PL AT. Figs. / : : PL AT. Figs. I, :. 

 Clypeaster subdepressus Agas& 



Florida, Yucatan Bank, I er Antilles. 84 -1952 fathoms. 



Stations, see Bull. .M. •'./.. VIII., No. 2, p. 7a. 1880. 



PI. XV a . 



Echinanthus rosaccus Gray. 

 Yucatan, Cuba, L i Antilles. 14-118 fathoms. 



The specimens dredged by the Blake show the usual differences in the 



comparative height and length of the lest. 



Echinarachnius parma Gray. 



I. • N, Long. 71 22* 30" W. Lat 41° 30* X.. Long. 66° W. Off Newport 71-306 



lathi 

 F.,r li-t of Stations, see Bull M. C. /. . VIII.. No. 2, p. 7a, L880. 



The genus Echinarachnius extends to a greater depth than Mellita. The 

 former was very common beyond the 100 fathom line north of New York, 

 and on the George's Bank, but to the south it was not found at the same 

 depth, nor were any of the species of Mellita. and but one of Kneope. 

 dredged by the Blake beyond the lou fathom line in the very districts in 

 which these genera are the mosi typical littoral species. 



• 1 would refer also to an article on the Loganidm in Ann. and Mag. Nat Hi -t., No. 62, foi February, 

 1883. I do doI propo the statements made l<y Prof. !■'. J. Loll. 



