336 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 8 



fms), and the 3 young individuals also mentioned are from Station 265- 

 34 in Petatlan Bay, close by in 5-10 fms. In addition to these clearly 

 identifiable specimens there are 146 small Encopes, 4-15 mm across, which 

 are presumably young individuals of this fine species. Fifty-eight of these 

 are from Station 764-38 (Type station). The others are from Station 

 264-34, south of White Friars, in 25 fms ; Station 265-34, Petatlan Bay, 

 5-10 fms; Station 267-34, west of Morro de Petatlan, 25 fms and Station 

 965-39, Tenacatita Bay, 8-15 fms. 



Type. — Holotj'pe, AHF no. 55, 5 paratypes. 



Type locality.— Station 764-38, North of White Friars, Mexico, 

 15-20fms, January 8, 1939. 



Distribution. — Petatlan Bay to Tenacatita Bay, Mexico. 



Depth. — 5-25 fms. 



Specimens examined. — The type, paratypes and 146 juvenile speci- 

 mens from 6 stations. 



Encope insularis^*^, new species 

 Plate 61, Figs. 58-59 



Test large and flat, moderately thin at the margins, conspicuously flat 

 and thin in young specimens (under 100 mm in diameter). Length 135 

 mm, width 133 mm, height 14 mm; greatest thickness on a line connect- 

 ing the anterior lunules, whence test slopes evenly to the anterior margin 

 and somewhat more gradually to the posterior margin. Unpaired petal 

 about 30 mm long and 12 mm wide becoming somewhat pointed at tip 

 but not closed; the poriferous zones are narrow (3 mm) with the ridges 

 bearing about 10 tubercles; the interporiferous area is 6 mm wide, its tip 

 about 1 1 mm from the anterior lunule which is 9 mm long and nearly 4 mm 

 wide, located 8 or 9 mm from test margin. Anterior paired petals rather 

 far back, a little shorter and wider than the unpaired one. Lunules of 

 these petals very similar in size and form to that of the anterior area. 

 Posterior petals longer than the others, about 35 mm in length and 15 mm 

 uide, their lunules long and narrow, 20 mm by 5 mm only 8 mm from 

 margin. In all specimens except the holotype and the next largest, these 

 lunules remain open distally. Interambulacral lunule long and narrow, 

 about 20 by 4 mm, nearly 20 mm from margin, its anterior end 8 mm in 

 front of the paired lunules. Posterior margin of test nearly straight in the 

 type but less definitely so in other specimens. Lower surface of test flat and 

 not peculiar. Spines of abactinal surface very numerous, slender with more 



^^insularis, of an island, in reference to its occurrence at Socorro and Clarion 

 Islands. 



