528 ECH1NARACHNIUS PARMA. 



distance from the edge of the test to the centre, leaving narrow ambulacral 



passages. 



,l;i]p;m. 



Echinarachnius parma 



! Scutella parma LaMK., 1816, An. s. Vert., p. 11. 

 ! Echinarachnius parma Gray, 1825, Ann. Phil., ]>. 6. 

 (See Tart II. p. 816.) 



PL XI". f. 4-5; PL XI: f. 1-5; PI. XII. f. 1-1.7; PL XXV. f. 88-41; 

 PI. XXVI. f. 15 -is; PI. XXXI. 



The range of this species is quite remarkable, occurring as it does on both 

 sides of the Pacific and one side <>!' the North Atlantic. I have carefully 

 compared the specimens from the different Idealities, and can find no valid 

 grounds for considering them distinci species. 



There is. however, some doubt of the correctness of some of the localities, 

 as, for instance, the lied Sea. which is found on labels both of the .lardin des 

 Plantes and the Ecole des .Mines. There seems no reason to doubt the 

 authenticity of the Australian specimens. 



New Jersey; Labrador; Vancouver l.»lan>l ; Kamtchatka; Australia. 



ARACIIXOIDES. 



Arachnoides Ku-'.IM, 1734, Nat. Dkp. Ech. 



Test depressed, conical ; outline circular. Anus supramarginal ; four and 

 five genital pores in the only species known. Interambulacra sunken below 

 the level of ambulacra. Ambulacral furrows simple, and extending from 

 the actinostome in an unbroken line to the apical system. Tubercles of am- 

 bulacra, both the primaries and miliaries, arranged in oblique lines across the 

 plates, both on the actinal and abactinal surfaces. The interambulacra] tuber- 

 culatum is coarse and irregularly arranged, having the general Features of 

 allied genera, though remarkably larger tubercles, and les ..: crowded, on the 



