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PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 63. 



The edges are thin, exceptionally so for the genus, and the whole 

 test superficially is scutelliform. In the anterior ambulacrum III 

 there is a shallow rounded notch, and in the lateral ambulacra are 

 deeper and narrower notches, the deepest being in the posterior pair 

 of ambulacra, IV and V. The apical disk is central. The peristome 

 is small and also central. Continuing posteriorly irom the peri- 

 stome on the ventral side is a quite deep groove, and on the dorsal 

 side is a shorter and shallower groove. These grooves do not form 



Fig. I.— Encope annectans. Drawing op the type-specimen, katubal size, Restoked parts 



ARE INDICATED BT DOTTED LINE3. 



a hole through the test, but represent the incipient beginnings of the 

 lunule which is characteristic in Encope of the posterior interambula- 

 crum 5. This is most interesting and is discussed later at length. 



The type-specimen measures 86 mm. in length, 89 mm. in width, 

 and 8 mm. in height. The highest point is distinctly anterior to the 

 middle of the test. The specimen represented by a mold of the 

 ventral side is somewhat larger than the type. It measures about 

 93 mm. in length by about 96 mm. in width. 



In the type, the ambulacra! petals are broad, about equal in length 

 in the several areas, the posterior pair extending back to a line with 

 the anterior Hmit of the lunule in interambulacrum 5. Ventrally, the 

 ambulacral furrows are deep, slightly curved outward from the 



