2G5 BULLETIN OF THE 



area. This is narrow, leaving the broad, bare bands of the ambulacral 

 areas colored light yellow, giving this species a striking appearance. The 

 tubercles of the upper part of the test are quite small, closely croAvded 

 together; they increase in size in the interambulacral spaces of the lower 

 surface. The color of the spines is greenish yellow in the smaller, and in 

 the larger specimen the color was duller. 

 Oil' Charleston bar ; Florida in 34 fathoms. 



Mellita testudinata Klein, Nat Disp. Echin. 



Svn. Mellita pen tapora Lutk., Bid. 



Mellita quinquefora Ac, Agass. Cat. Rais. 

 " ainpla Holmes, Rav. Cat. 



The large series collected by the Thayer Expedition along the whole 

 coast of Brazil show that this species has a wide geographical range, and is 

 liable to great variations, indicating that the characters -which are described 

 as separating M. quinquefora and JV1. testudinata have no permanent 

 value. 



Littoral, to 7 fathoms. 



Mellita hexapora Ac, Agass. Cat. Rais. 



Syn. Mellita hexapora Luticen, Bid. 



caroliniana Rav., Cat. ; PI. Foss. S. C, PI. 1, fig. 4. 



Littoral, to 270 fathoms. 



Encope Michelini Ac, Agass. Cat. Rais. 



Syn. Encope Michelini Ac, Bull. M. C. Z., No. 2. 



" aberrans Martens, Wieg. Archiv. XXXIII. I. p. 112. 



The extensive suite of Encopidae brought home by the Thayer Expedition 

 from different points of Brazil, and more particularly the series of all sizes 

 of Encope emarginata which the Museum owes to the kindness of Dr. Fritz 

 Miiller, of I) jsterro, has satisfied me that Liitken is correct in uniting under 

 one name, tint of E. emarginata, most of the nominal species he mentions 

 (E. Valeneiennesii, subclausa, oblonga, E. quinqueloba Esn. and Grube), to 

 which we would add the nunc given by Beval, E. Griesbachii. E. tetra- 

 pora Gmel. must remain doubtful, as the original cannot be found in any 

 Museum. Yet I cannot, agree with him in referring to the same species 

 Encope Michelini Ac, in which the position of the apex is totally differ- 

 ent from that of any of the other species referred to E. emarginata, as is 

 readily seen by the excellent profile given in Agassiz Mon. d. Scut., PI. 

 6*, fig. 1". Nor can I agree with him in referring to Encope emarginata 

 E. grandis Ac, a species found in the Gulf of California, and Encope 



