72 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Echinodiscus bisperforatus var. truncatus. 



Lobophora truncata Aga siz, 1841. Mon. Scut., p. 66. 



Although those who have examined the most specimens agree that this 

 Echinodiscus is not a distinct species, the specimens I have seen are so very 

 sharply separated from any other member of the genus, it seems to me desirable 

 that they should at least bear a varietal name. Possibly this is the form Lam- 

 arck called Scutella bifora and in that case, his name might be used, but a variety 

 "bifora" of a species "bisperforatus" seems absurd. 



Astriclypeus. 



Verrill, L867. Trans. Conn. Acad., 1, p. 311. 

 Type, Astriclyp Verrill, 1867. hoc. dt. 



This genus is characteristic of Japan and is not known from elsewhere. 

 Tridentate and triphyllous pedicellariae, but no ophicephalous, were found. 

 The spines are solid and only slightly swollen at the tip. The pedicels seem 

 to lack calcareous particles of any kind. 



Astriclypeus manni. 



Verrill, 1867. Trans. Conn. Acad.. 1. p. oil. 



Plate 125, figs. 18-15. 



The valves of the triphyllous pedicellariae (PI. 125, fig. 15) are quite flat 

 with broadly rounded blades, with smooth margins. The tridentate valves 

 vary much in size, ranging from .10 to .43 of a millimeter in Length; the tips 

 are coarsely dentate (PL 125, fig. 14) and in small ones, there is often a single 

 conspicuous tooth (PI. 125, fig. 13) at the tip. It is rather odd that the Alba- 

 tross failed to collect this species on either of her Japanese expedition-. 



Encope. 



Agassiz, L841. Mon. Scut., p. 45. 

 Type, Echinodiscus emarginatus Leake, 177^ Add. ad Klein, p. l 



Although in his greal monograph o*i the scutellids, Agassii recognised nearly 

 a dozen species of Encope, and although several more were described in the 

 succeeding thirty years, in the RevisioD Mi-. A^i-siz reduced them all to five 

 valid species. The genus is exclusively American and tin 1 large amount of 



