PKIJONELLA PEIJA'CIDA. 53 



Peronella lesueuri. 



Laganum lesueuri Agassiz, lS-11. Mon. .Scut., p. 110. 

 Peronela lesueuri A. Agassiz, 1872. Rev. Ech., pt. 1, p. 14S. 



Plate 124, figs. 23, 24. 



The component rods of the itdliary spines do not seem quite so abruptly 

 widened as de Meijere figures them. The triphyllous pedicellariae are fairly 

 common and have very abruptly expanded valves (PI. 124, fig. 23). I failed 

 to find (in four specimens) any ophicephalous. The tridentate are very vari- 

 able, having valves ranging in length from .10 to .45 mm. One form has the 

 valves curved in such a way (PI. 124, fig. 24) as to resemble " globif erous " pedi- 

 cellariae and these are the most characteristic of all. This species reaches the 

 largest size of any of the Laganidae and specimens exceeding 130 mm. in length 

 are not rare. There are specimens in the M. C. Z. collection from Japan, Hong 

 Kong, Singapore, PhiUppines, Dutch East Indies, and Queensland. 



Peronella pellucida. 



Peronella (Laganum) pellucida Doderlein, 1885. Arch. f. Xaturg. 51, 1, p. 104. 

 Plate 142, figs. 1, 8-10. 



Doderlein gives 32 mm. as the diameter of his largest specimen, but one 

 in the M. C. Z. collection (PI. 142, fig. 1) is 50 mm. across. In large specimens, 

 the test is not nearly so thin and transparent as in younger specimens although 

 it is not as thick-walled as in related species. The miliary spines have their 

 component rods very abruptly expanded at the tip; the margin of this expanded 

 part is usually entire, but may be finely or coarsely serrate. All three kinds of 

 pedicellariae are present, but they are very small; the largest tridentate have 

 valves only .10-. 12 mm. The valves of the triphyllous have coarsely dentate 

 margins, as in rubra (PI. 124, fig. 20) but the "teeth" are longer. 



The Albatross took pellucida twice during its trip to Japan in 1900 and 

 once during its much more extended visit in 1906. The specimens range from 

 20 to 45 mm. in length. 



Station 3708. Off Ose Zaki, Honshu, Japan. Bott. temp. ? 60-70 fms. 

 Gn. m., vol. s., a. 



Station 3713. Off Ose Zaki, Honshu, Japan. Bott. temp. ? 45-48. 

 fms. Vol. s., sh., r. 



