24 BULLETIN OF THE 



Melobosis Gir. Proc. Bost. Soc. Nat. Hist. 1850. 



Melobosis rarispinus A. Ag. 



Syn. Salmacis rarispinus Ag. Cat. Rais. — East India. 



Lytecllinus Ag. — Psa.7)imechinus Ao. p. p. 



Lytechinus carolinus Ag. 



Syn. Echinus variegatus Rav. (non Lamic), Cat. Echin. So. Car. — ■ 

 South Carolina, Georgia, and Florida. 



Lytechinus variegatus A. Ao. 



Syn. Echinus variegatus Lamk. (non Rav.) ; Psammechinus variegatus 

 Ag. Cat. Rais. — Cienfuegos, Ilayti. 



Lytechinus atlanticus A. Ag. 



Readily distinguished from the South Carolina species by the large num- 

 ber of tubercles in each vertical row, and from the L. variegatus by the 

 smaller size of its spines. — Bermudas. 



Boletia Ag. Cat. Rais. — IJemiecItinus Gir. Proc. Bost. Soc. N. H. 1850. 



Boletia granulata A. Ag. 



Remarkable for its comparatively long spines. Tubercles uniform in 

 size, very closely crowded together. — Sandwich Islands. 



Boletia rosea A. Ag. 



Spines exceedingly short and stout ; the exterior row of tubercles in am- 

 bulacral and interambulacral space of greater size. — Acapulco. 



Tripneustes Ag. Cat. Rais. (emend.) 

 Tripneustes ventricosus Ag. Cat. Rais. — Florida. 



Syn. Heliechinus Gouldii Gir. Proc. Bost. Soc. Nat. Hist. 1850. 

 The genus is here limited to species in which the median ambulacral and 

 interambulacral space is covered with tubercles. There is in the collection 

 of the Smithsonian a species from Guayamas, T. depressus A. Ac, closely 

 allied to T. ventricosus, which differs from it in the flatness of the test, the 

 large and uniform size of the tubercles, and the stoutness of its spines. 



Hipponoe Gray, 1841 ; Proc. Zool. Soc. 1855. 

 Hipponoe sardica Gray, Proc. Zool. Soc. 1855. 



Syn. Tripneustes sardicus Ao. Cat. Rais. — Zanzibar. 



Hipponoe violacea A. Ag. 



Tubercles small, numerous, of uniform size ; abaetinal portion of test reg- 

 ularly arched. Spines short, slender; color of test dark violet. — Sand- 

 wich and Kingsmills Islands. 



Hipponoe nigricans A. An. 



Row of large tubercles in interambulacral space near the oral area 

 other tubercles small. Ambulacral zone broad near abaetinal region, with 



