422 ASTIIENOSOMA. 



The exact locality of this species was long doubtful. The Museum owes a 

 specimen to the Essex Institute from Zanzibar, and several to Mr. N. Pike 

 from Mauritius. Dr. Semper has collected it at the Philippines. Gray first 

 gave as its habitat South America: these specimens he afterwards separated 

 as a distinct species ; they prove to be A. pulviuata, which is not uncom- 

 mon in some European Museums from the Gulf of California. 



No. Tub. Diameter Diameter Diameter 



InterambulacraL Diameter. Height. Actiual System. Abactiual System. Anal System. Spines. 



20. 36. 11. 13. 9.2 5. 



Zanzibar ; Philippine Islands ; East India Islands. 



ASTHENOSOMA. 



Asthenosoma Grube, 1867, Jahresb. d. Schles. Gcs. f. Vat. Cult 

 (See Part II. p. 272.) 



Asthenosoma hystrix 



ICalveria hystrix W. Tiiomps.. 1869, Prelim. Drodg. Rep., Proc. R. S. 

 ! Asthenosoma In/sirix A. Agass., 1872, Rev. Ech., Tt. I. p. 93. 

 (See Part II. p. 273.) 



Pi. ir.f. is; Pi xxxvin.f. 7-o. 



Straits of Florida ; Roekall and Rona. 



Asthenosoma varium 



! Asthenosoma varium Grube, 1867, Jahreab. d. Schles. Gcs. f. Vat. Cult. 



PI. XXIV. f. 14. 



The following are the principal points mentioned in Grube's notice of this 

 species : — 



"Test exceedingly flat, four and three quarter inches in diameter b} T one 

 in height ; differs from all other Echini in having a flexible test, owing to 

 the limitation of the limestone deposits in the coronal plates, which leaves 

 the edge so flexible that if the sea-urchin is lifted by the edge the whole 

 test is bent. The spines which cover the abacterial part of the test are 

 inserted at the base in a muscular sheath ; similar spines occur on the actinal 

 side more or less spathiform, and in addition, much larger spines, at least 

 five eighths of an inch in length, hollow like the others, slightly curved, trun- 

 cated, club-shaped, flaring into a funnel-shaped extremity. Pedicellariae nu- 

 merous, scattered over whole surface of test, many of large size. Primary 



