from the Gulf of California. 97 
From oe center to posterior edge, 2°20 2°20 
Center to anterior ones 1:98 2°00 
Baie agate! edg 2:20 2°10. 
Length of anterior oa ambulacral petal, from center, .__.. 1°28 1:26 
Greatest prendtn of d 50 “68 
Breadth of its senionse area, “20 "30 
Length of antero-lateral pair, 1°25 115 
Breadth of do. 50 65 
— of enclosed ar area, 16 27 
Length of ‘yaaa, pair, 1°65 1°55 
Breadth o: “45 62 
Breadth ot enclose area, 12 “20 
Pe Californica Verrill, sp. nov. 
Test broad, thin at the edge, rounded anteriorly, bidet 
behind the middle, sub-truncate or rounded posteriorly ; usually — 
about as broad as long, sometimes broader than long. Apex 
behind the center. In profile the outline descends from the 
center to the anterior edge, but rises from the center to the ee 
nior foramen, from which it descends rapidly to the edge. 
posterior interambulacrum is, therefore, swollen and the test is 
most elevated near its foramen. Ambulacral rosette with the 
Petals a8 oval, somewhat obovate, broadly rounded outwardly ; 
the anterio ; the odd anterior one 
somewhat: longer and narrower and a little shorter than those of 
the posterior pair, which are of about the same form and not 
¢ Posterior foramen variable in form and size, usually 
rather small, regularly oval, or rounded, sometimes long oval, or 
even narrow and elongated, occasionally quite large and broad 
oval, often ag he beneath, sometimes constricted in the middle. 
Ambulacral foramina also ‘quite variable in form and size, but 
commonly small and rather regularly oval, often ata considerable 
= from the ma 
specimens, showing the extreme variations, give the 
Glloning measurem: 
Len f test, sen AO 4:30 
a 4°65 Eo 
Cente wi hae eh. Bt 
. to. anterior edge, eee ge Gee 
3 anterior foramen, -- . piers +18 
Toes pI cic Ginnie "s Prt 
a ee “ foramen. cy 1°60 bo 
: “posterior yeaa neeceerte 185 «1-70 
= postero-lateral foramen, —-.---- * 115 1-10 
“posterior foramen,-..-.. ------- sorties 
“a 
Length 
Am. Jour, Sc1.—Seconp Szrtes, Vou. XLIX, No. 145.—Jax., "1870. 
7 
