52 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Height of test ratljer more than .25 of length; periproct very large, longitudinally 



elongated; anal plates without spines; petals very broad, short, pointed . . . analis. 

 Genital pores in interambulacra at a greater or less distance from madreporite peronii. 



Peronella strigata,' comb. no\. 



Laganum strigatum A. Agassiz and Clark, 1907. Bull. M. C. Z., 50, p. 250. 



Plate 142, figs. 11-13. 



Length, 30 mm.; breadth, 29 mm.; height, 6 mm.; margins about 1.8 mm. 

 thick; petaloid area, 12 mm. long; petals about equal, 1.7 mm. wide, open bj' 

 nearly a millimeter, as poriferous areas (12-14 pore-pairs on each side) are 

 nearly parallel. Mouth central. Periproct, 2.5 mm. long by 2 mm. wide, situ- 

 ated 3 mm. from margin, covered with, plates which do not carry spines. Genital 

 pores four the posterior interambulacrum having none. Tuberculation of test 

 moderate, including many glassy tubercles of about the same size and abundance 

 as the primary tubercles. Sutures between plates sharp and well defined. 

 MiHary spines with the component rods graduallj^ widened and rather fineh' 

 serrate at tip. Pedicellariae not peculiar or distinctive in any waj^; no triphyl- 

 lous were found ,and tridentate and ophicephalous are not common. Color 

 light browii with the sutures darker and more or less pmple. 



The holotype and only specimen is from Albatross 



Station 3859. Off Mokuhooniki Islet, Pailolo Channel, Hawaiian Islands. 

 Bott. temp. 60.5°-60.2°. 138-140 fms. Fne. s., m. 



In the original description of this species, specimens of Laganum fudsiyaina 

 were included and are referred to as having ^t'e pores. The species are undoubt- 

 edly nearly allied but aside from the difference in number of genital pores 

 and in color, there is a difference in the form of the i^eriproct, which is not 

 elongated in fudsiyama. 



Peronella orbicularis. 



Echinodiscus orbicularis Leske, 177S. Add. ad. Klein, p. l-t-l. 

 Peronella orbicularis A. Agassiz, 1872. Rev. Ech. pt. 1, p. 149. 



Specimens of this species are in the AI. C. Z. collection from the Persian 

 Gulf, Phihppine Islands, and Torres Strait. J\ly observations accord with 

 de Meijere's, except that I failed to find the tridentate pedicellariae which he 

 figures. 



' Strigatus = furrowed, in reference to the very distinct sutures between the plates. 



