NO. 5 CLARK : ECHINI OF WARMER EASTERN PACIFIC 327 



and truncate. Around the other lunules they are smaller and more slender. 

 The bare test is a distinct graj^ but the spine covering is a very dark shade 

 of olive gray. 



There are 4 specimens of wetmorei in the collection, each about 

 100 mm long with a width nearly or quite as great. One specimen is in- 

 jured posteriorly so that the unpaired lunule has never been cut ofiE at the 

 rear. The other 3 specimens are symmetrical and uninjured. All of these 

 specimens were taken in 5-10 fms on the south side of Petatlan Bay, 

 Guerrero, Mexico, in March 1934. Besides these adults there are 32 very 

 young Encopes, 6-15 mm in diameter, taken in 25 fms south of AVhite 

 Friars, near Petatlan Bay, which may be referred to wetmorei as they are 

 apparently not perspective, and the position of the posterior lunule indi- 

 cates they must be one of the two species. 



Distribution. — Mazatlan, Mexico, to Pearl Islands, Panama. 



Ty/.^.— U.S.N.M. No. E. 6768. 



Type locality. — San Jose, Pearl Islands, Bay of Panama. 



Depth. — 5-25 fms. 



Specimens examined. — 36 specimens from 2 stations. 



Encope laevis^^, new species 

 Plate 54, Fig. 45 ; Plate 55, Fig. 46 



Length 117 mm, width 115 mm, height 12 mm. Test stout, relatively 

 heavy and quite flat dorsally; highest point only about 25 mm from 

 anterior margin, thence it slopes very gradually and slightly to the un- 

 paired lunule, the margins of which are a little elevated ; height of test 

 there about 10 mm; posterior margin of test slightly convex but in other 

 specimens it may be quite straight. Unpaired petal about 40 mm long, 

 21 mm wide some 10 mm from the tip, which is nearly but not quite 

 closed; poriferous zones veiy wide (6 mm) with the narrow, crowded 

 ridges each bearing some 25 minute tubercles, of about the same size as 

 those which densely cover the median area. Anterior lunule small, about 

 6 mm long by 2 or 3 mm wide, 8 mm from the margin. Anterior paired 

 petals about 40 mm from anterior margin only about 10 mm in front of 

 the madreporite which is very large ( 10 mm) and densely granulated ; the 

 petals are about 35 mm long and 20 mm wide near the blunt tip; their 

 lunules are only about 9 or 10 mm from test margin and only a little 

 larger than the unpaired one. Posterior petals 42 mm long and 20 mm 



11 laevis=%mooth, in reference to the remarkably smooth upper surface. 



