Verrill, Notes oti Radiata. 585 



of the common West Indian Echinometra Michelini. The specimen 

 referred by me to that species (p. 308) proves by comparison with the 

 types of Mr. Agassiz, to be Toxocidaris crassispina A. Ag., from 

 Japan, (not the young of Echinometra Jlichelini, to which Mr 

 Agassiz formerly referred it in the Bulletin M. C. Z., i, p. 260). Since 

 Anthocidaris of Ltitken is identical with Toxocidaris A. Ag., this 

 species was referred by me to the right genus, but the erroneous local- 

 ities on the labels of two separate lots, led to the mistake as to the 

 species, which in this group of genera have not been described with 

 sufficient care to make them recognizable with certainty, without a 

 comparison with the original types. 



The other species of Toxocidaris, described from the west coast, 

 are as follows: 



T. homalostoma (p. 333) =:Echi?i,iis Jimnalostoma Val., Voy. Venus, Zooph., PI. 6, 



figures 2-2 f., Galapagos. 

 T. erythrogrammi (p. 335), =Echiiiiis erythivgramma Val., op. cLt., PL 7, figures 1- 



Id., Chili. 

 T. Franciscana A. Ag., (p. 327), California. 



The last species, however, appears to agree nearly with Loxechinus. 

 The two groups are closely allied and perhaps ought not to be sepa- 

 rated. Both have regular arches of numerous pores above, and the 

 poriferous zones expanded beneath, but less so in the latter. 



Echinometra Van Brunti A. Ag., (pp. 309, 375). 



The numerous specimens of this species sent by Capt. Pedersen 

 from La Paz show great variation in form. Many are quite oblong, 

 while others are nearly circular ; most of them are quite depressed, 

 but some are considerably elevated at the center. Some have wider 

 poriferous zones and more oblique arcs of pores above than the typi- 

 cal form, in this respect approaching E. rupicola, rendering it possi- 

 ble that the two forms are only variations of one species, but they ali 

 have the interambulacral tubercles very unequal and but two rows 

 of the largest ones, with only two, close, alternating rows of second- 

 ary tubercles between, differing in this respect very decidedly from 

 E. rupicola. The specimens hitherto received, therefore, do not war- 

 rant the union of the two species. 



Encope grandis Ag. (pp. 3io, 375). 



Verrill, Am. Journ. Science, xlix, p. 96, 1870. 



Of this very distinct species there are several hundred specimens in 

 the La Paz collection, varying in size from 3 inches in length by 

 3-20 wide, to 4-60 inches by 4-40. There is but little variation in out" 



