98 A. E. Verrill on Echinoderms and Corals 
Breadth of posterior foramen, -. "22 “26 
Length of congas? srobulecral petal, from conter, Sem oes 1-42 1°32 
Breadth pans “65 50 
Breadth of e “30 18 
mate of pong te Setlk 1:28 1:10 
Breadth, Se as “67 50 
Breadth of enclosed area, 4 9 
Length of postero-lateral petals, _..........--. --.----- 1°58 1°36 
Breadth, “68 5 
Breadth of enclosed area, "25 16 
Of this species there are 74 specimens in the collection from La 
Paz, and I have seen others from Cape St. saga It varies 
in the form of the sont as shown by the above maedsnreniel 
the ambulacral grooves beneath also vary in direction. call 
the ae mens agree in art their greatest elevation behind 
bo 
=A 
ent inte ture, will readily separate this species from 
occidentalis V., and from £. micropora Ag., whether ape be 
the same, as Mr. A. Agassiz supposes, or not.* In E. occiden- 
talis the createst dlavaton is in front of the center, and tha is 
Re Ge the Bulletin of the —— of Comp. Zodlogy, No. 9, P- 
mak pees says: “from a careful com comparison of specimens of E. cyclopora, micro- 
pora, and perspectiva ahi a species) there i as doubt that these are only *sominal 
species, all identical with Verrill’s E. occidentalis.” The latter is the same as Z. 
a Ag. (non on Gmelin), but I believe Mr. Agassiz goes too far in umting all 
these other forms into one species, for if this can be dono there is no reason what- 
ever for keeping the species from the two two coasts separate, for there is often much 
i has united. Buts 
; p Hy hie 
the localities of the e types of E. micropora, E. —— Jonge were 
unknown, the two last having been described from 
pretees. for such species have been recorded from Africa and other little ‘explored 
localities. Mr. Agassiz does not state what he pr as the characteristic of the 
pundies ous species thus ituted, nor in w ore emar- 
c t differs from E. 
ginaia of the Atlantic, nor does it appear certain that he has examined and 2 
in both and 
