42 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Station 4046. Off Kawaihae Light, Hawaii, H. I. Bott. temp. 59°. 71-147 

 fms. Co. s., for. 



Station 4064. Off Kauhola Light, Hawaii, H. L Bott. temp. 69°. 63- 

 107 fms. Vol. s., for., co. 



Station 4066. Off Ka Lae-o Ka Ilio Point, ]\laui, H. I. Bott. temp. 

 52.5°. 49-176 fms. Rky. 



Bathymetrical range, 49-222 fms. Extremes of temperature, 73°-52.5°. 



Fiftj'-seven specimens. 



Clypeaster lamprus,' nom. nov. 



Clypeaster latissimus A. Agassiz, 1SS3. Mem. M. C. Z., 10, p. 41. Xon C. latissimum A. Ag.. 1872. 

 Rev. Ech. i)t. 1, p. 101. 



Plates 122, figs. 1-4; 123, figs. 21, 22. 



This is one of the best defined and most easily recognized species in the 

 genus but as it is certain!}^ not the Laganwn latissimum of Agassiz and Desor, 

 1847, it cannot be called "Laganwn latissimum Hupe, 1856," even if it be granted 

 that Hupe had specimens of this species as the basis for his name. And it is 

 almost certain that Hupe never saw this species which was collected by the 

 Blake at five stations in the Lesser Antilles in 88-120 fms. The figures given 

 by Mr. Agassiz (1883, Mem. IM. C. Z., 10, pis. XV", fig. 3; and XV^, fig. 3) show 

 the characteristic features admirably, but certain additional details deserve 

 mention. 



The abactinal primaries are smooth, pointed and many, especially of the 

 larger ones near apex of test, tend to be spatulate. The actinal primaries are 

 more diversified; the small ones (PI. 122, fig. 4) are often curved, while the 

 larger ones may be doubly curved (PI. 122, fig. 2) and spatulate (PI. 122, fig. 3) 

 and the largest, which may be 10-12 mm. long, are cur\-ed and broadly expanded 

 at tip (PI. 122, fig. i). Pedicellariae are very conmion; the triphjdlous are very 

 small with valves only .07 mm. long while the ophicephalous have heads .40 mm. 

 long, with valves much hke those of virescens. The tridentate pedicellariae 

 are of two kinds although these intergrade to some extent; the small ones 

 (PI. 123, fig. 21) are not peculiar or characteristic, but the large one, with curved 

 valves up to .80 mm. in length (PI. 123, fig. 22), are unlike any that are known 

 in other Clypeasters; the blade has the margins much incurved, thus tending 

 to become tubular and the valves meet only at the tip. 



* XafjiTpds = splendid, magnificent. 



