306 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



Clypeaster japonicus. 

 Doderlein, 1885. Arch. f. Naturg., 51 (1), p. 100. 



2 specimens, 87 and 100 mm. in long diameter. Sagami Bay, Japan. — 1 speci- 

 men, 54 mm. in long diameter. Sagami Bay (35° 2' x N. 138° 50' E.), Japan, 

 55 fathoms. — 2 specimens, 15 mm. in long diameter. Misaki, Sagami Bay, 

 Japan. Owston collection. 



The young ones from Misaki are too small to show specific characters plainly, 

 but the ventral surface is so concave that I think there is little doubt that they 

 axe japonicus. The specimen 54 mm. long is very different from the larger adults, 

 but its peculiarities may be due to immaturity. The primary spines are relatively 

 few dorsally, only about one-third to one-half as many per square centimeter as in 

 typical japonicus (20-25 as against 50-75), and instead of beiug greenish-white 

 with a broad reddish or brownish band around the middle, they are glassy white ; 

 some, however, do show a faint brown baud. 



Clypeaster scutiformis- 



Echinus scutiformis Gmelin, 1788. Linn. Sys. Nat., p. 3184. 

 Clypeaster scutiformis Lamarck, 1816. Anim. s. Vert., 3, p. 14. 



1 specimen, a broken, bare test, 23.5 mm. in long diameter. Buleleng, Bali, 

 Dutch East Indies. Barbour collection. 



Laganum laganum. 



Echinodiscus laganum Leske, 1778. Add. Klein, p. 140. 

 Lagana laganum de Blainville, 1830. Diet. Sci. Nat., 60, p. 196. 



4 specimens, including 3 bare tests, 24-32 mm. long. Saonek, Waigiou, New 

 Guinea. Barbour collection. 



According to our now generally accepted codes, the name bonani cannot be re- 

 tained for this species, as it is one of Klein's (1734) names re-introduced by 

 Agassiz in 1841. 



Laganum pellucidum. 



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

 Laganum pellucidum A. Agassiz & Clark, 1907. Bull. Mus. Comp. Zool., 51, 

 p. 128. 



2 specimens, about 22 mm. long. Misaki, Sagami Bay, Japan. Owston col- 

 lection. 



Arachnoides placenta. 



Echinus placenta Linne', 1758. Sys. Nat., ed. 10, p. 666. 

 Arachnoides placenta Agassiz, 1841. Mon. d'Ech. Scut., p. 94. 



1 specimen, a broken, bare test. Ampenan, Lombok Island, Dutch East Indies. 

 Barbour collection. 



