326 ALLAN HAN'COCK PACIFIC EXPEDITIONS VOL. 8 



Encope perspectiva L. Agassiz 

 Plate 53, Fig. 43 



Encope perspectiva L. Agassiz, 1841, pp. 51, 146, pi. 10b, figs. 1-5. 

 A. H. Clark, 1946, pi. 3, upper fig. 



It is a curious thing that this well characterized species is not ade- 

 quately represented in the Hancock collection. In fact the only Encopes 

 which can be referred to it with any confidence are 5 young ones and 2 

 fragments which were taken at Station 485-35 in Tenacatita Bay, Jalisco, 

 Mexico, in 5 fms on a bottom of sand and shells. They range from 37 x 39 

 mm to 56 x 58 mm and are exceedingly thin and flat. The unpaired lunula 

 is well forward between the hind pair of petals and is the largest of all. The 

 spine-covering of the dorsal side of the test is made up of countless spine- 

 lets whose tips are ovate balls — a distinguishing feature of perspectiva. 

 The color ranges from Lincoln green, through dusky olive green to dusky 

 yellow green. The lower surface is brown, with more or less gray on the 

 ambulacra. The Velero did not take an adult example of this well-marked 

 species at any other place, but in March, 1939, she dredged, at Chacahua 

 Bay, Mexico, some distance southeast of Tenacatita Bay, 14 specimens of 

 very young Encopes, which have notably long, narrow unpaired lunules 

 and are apparently young wetmorei or perspectiva, presumably the latter. 



Distribution. — Known range from other authors, Ballenas Bay, 

 Lower California to Costa Rica. 



Type. — Unknown. 



Type locality. — Unknown. 



Depth.— 5-\5 fms. 



Specimens examined. — 21 specimens from 2 stations. 



Encope wetmorei A. H. Clark 

 Plate 54, Fig. 44 



Encope wetmorei A. H. Clark, 1946, p. 2, pi. 1 ; pi. 2, fig. 1. 



This interesting new species, so recently described, may be distin- 

 guished at once by the anterior position of the unpaired lunule, which lies 

 well in between the posterior petals, and by the peculiar character of the 

 spinules which cover the dorsal surface. These spinules have inverted 

 conical tips, the bases of the cones forming a more or less smooth pavement 

 covering the upper side of the test. This pavement is not so continuous or 

 smooth as in the following species but is very faintly rough or "furry." The 

 spines around the unpaired lunule are relatively long (3 mm or 4 mm) , flat 



