Verrill, JVotes on Badiata. 309 



Echinometra Van Brunti A. Agassiz, op. dt., p. 21. 



Several large specimens of this species, collected at Cape St. Lucas 

 by J. Xantus, have been presented by the Smithsonian Institution. 

 The examples originally described were from Acapulco. 



The largest specimen has a test 2 inches across the longest diam- 

 eter; 1-7 wide; "8 high; actinal opening •85 in diameter; longest 

 spines, which are somewhat broken at the end, 1 "6. 



In the form of the test this species resembles the preceding, but it 

 is often even more depressed. The interambulacra, in a specimen 

 1*6 inches in diametsr, have two rows of large primary tubercles, 

 with a row of much smaller ones outside of- them on each side, box'- 

 dering the ambulacra, and two imperfect median rows of similar 

 secondary tubercles. The ambulacra have two rows of tubercles, 

 which are smaller than the principal tubercles of the interambulacra. 

 The poriferous zones are very narrow on the upper surface, having 

 nearly vertical arcs of about seven pairs of pores ; on the lower side 

 the arcs become more nearly transverse, and the zones are much 

 wider. The genital plates are less acute outwardly, and less promi- 

 nent than in the preceding species. The spines are large and strono- 

 and when perfect taper to a sharp point. They seldom equal in 

 length the greatest diameter of the test. Color, dried from alcohol 

 deep ashen brown, or purplish. 



This species may be easily distinguished from E. rupicola by the 

 fewer and larger interambulacral tubercles ; stouter spines ; and the 

 very naiTow poriferous zones above, with their rapid dilation beneath. 



Encope occidentalis Vemii. 



Encope tetrapora Agassiz, Monog. d'Ech., Scutelles, p. 49. Tab. 10«. figs. 1-3 1841. 

 (non Gmelin). 



Plate X, figures 4, 4=\ 



Numerous specimens of this species are in our museum, which were 

 dredged in the Bay of Panama in 5 to 8 fathoms, shelly bottom, by 

 Mr. Bradley. He also obtained one large specimen at Zorritos, Peru. 

 The specimen described by Prof Agassiz came from the Galapago 

 Islands. 



The largest specimen is 5*5 inches long ; with the extreme breadth 

 5*7; height '6 ; from center to anterior opening 1-9 ; to anterior-late- 

 ral 1*8; to posterior-lateral 2 ; to posterior 1-5 ; from center to ante- 

 rior margin 2*6 ; to posterior margin 2*9 ; from center to end of ante- 

 rior ambulacra! rays 1*7; of lateral 1'5; of posterior 1-72 ; breadth 

 of anterior ray -67 ; its median region -3; breadth of lateral -7; its 

 middle 'So ; breadth of one of the posterior pair '7 ; the middle area 

 •3 ; length of posterior foramen •'. 5 ; center of mouth to anus '65. 



