MUSEUM OF COMPARATIVE ZOOLOGY. 155 



Straits. The original type specimens were obtained off Sand Key, and 

 sevei'al individuals from Barbados and Grenada differ so much both 

 from them and from one another, that I was at first inclined to regard 

 them as representing two new species ; but a more careful examination 

 did not confirm this impression. Thei'e are, however, three distinct 

 species besides the type, to which the name Ant. Hagenii has been 

 given. The specimens sent to the Museums at Edinburgh and Copen- 

 hagen under this specific name do not belong to the genus Antedon at 

 all, but are varietal forms of Actinometra meridionalis A. Agass. sp. ; 

 and among the large number of individuals of Ant. Hagenii from the 

 Florida Straits I found a few examples of two entirely new Antedon 

 species. One of them is distinguished by having enormous lancet-like 

 processes on the lower joints of its oral pinnules ; while the other is a 

 very exceptional type, with no pinnules at all upon the second and third 

 brachials, though those of the other arm-joints are developed as usual. 

 This is a singular condition, which occurs but rarely among the Coma- 

 tulce. The " Challenger " dredged a specimen near the Philippine 

 Islands which presents the same peculiarity, and another in which the 

 large pinnule on the second brachial is present as usual, but that on the 

 third brachial is undeveloped, though those of the fourth and succeeding 

 arm-joints are perfectly normal. Except in the remarkable type 

 Atelecrinus (Figs. 1, 2, 7), which has no pinnules at all upon the ten or 

 twelve lower arm-joints, these are the only Comatuloe I have ever met 

 with in an examination of several hundred individuals that present any 

 departure from the ordinary pinnule arrangement. 



At Station cccxi. of the "Blake" dredgings in 1880, on the Atlantic 

 coasts of the United States, a small ten-armed Antedon was found to be 

 very abundant. It was doubtfully referred by Mr. Agassiz* to Ant. 

 Sarsii, which species was obtained by Mr. Verrill, somewhat later in the 

 season, at several localities off the northern coasts of New England.t I 

 have carefully compared the " Blake " specimens with a Norwegian 

 example of Ant. Sarsii, which I owe to the kindness of Prof G. 0. Sars, 

 and also with the two specimens obtained by H. M. S. " Porcupine " in 

 1869, at two stations in the " cold area" of the North Atlantic. 



All the specimens agree in their general characters, and must certainly 

 be united under one specific name ; but they differ considerably among 

 themselves while corresponding fairly well with MUller's description of 



* Bull. Mus. Comp. Zoijl., Vol. VI. No. 8, p. 150. 



t Notice of the Remarkable Marine Fauna occuping the Outer Banks off the 

 Southern Coast of New England. American Journal of Science, Vol. XX. p. 401. 



