446 PROCEEDINGS OF THE NATIONAL MUSEUM vou 86 



oms. Freyella mexicana is the first species to be reported from the 

 Gulf of Mexico. 



Although in Freyella mexlcana the first two adambulacrals are 

 united by syzygy, the marginals are greatly reduced and do not bear 

 spines, the number of spines on the mouth plates and on the adam- 

 bulacrals is exceptionally large, and directly beneath the prominent 

 interradial there is a small plate that separates the upper ends of the 

 two mouth plates of each pair, it does not seem to me that it differs 

 sufficiently from related species to justify the creation of a new 

 genus for its reception. 



The other 6-rayed species of Freyella are: Freyella sexradiata E. 

 Perrier from west of northern Spain in 2,255 fathoms; F. tuberculata 

 Sladen, from between the Canary and Cape Verde Islands, between 

 Ascension Island and the African coast, and the eastern tropical Pa- 

 cific in 2,222-2,400 fathoms; F. henthophila Sladen, from the central 

 south Pacific in 2,550 fathoms; and F. oligohrachia H. L. Clark, from 

 the eastern tropical Pacific in 2,222-2,320 fathoms. All these differ 

 from F. mexicana in having the first two adambulacrals articulated 

 instead of being united by syzygy; in having the marginals with 

 spines, at least on alternate plates; in lacking the small unpaired 

 interradial plate between the upper ends of the mouth plates of each 

 pair ; in having the mouth plates with 2 to 4 spines instead of 9 to 12 ; 

 and in having the adambulacrals with 1 or 2 spines instead of 4 or 5. 



In certain respects Freyella mexicana suggests Colpaster scutigerula 

 Sladen, from southwest of the Canary Islands in 1,525 fathoms. In 

 this species the first two adambulacrals are united by syzygj^; the 

 mouth plates have 6 spines, and the adambulacrals have 4 or 5 spines ; 

 and there is an unpaired plate just below the interradial plate as in 

 F. mexicana, but this is much larger and separates the first adam- 

 bulacral plates instead of the upper ends of the mouth plates. In 

 Colpaster the plates of the disk bear stout stumps ending in 4 or 5 

 radiating thorns instead of spinelets as in Freyella mexicana. 



OPHIUROIDEA 



OPHIOMYXA FLACCIDA (Say) 



Localities. — Smithsonian-Hartford station 12, Haiti (1, E. 5471). 

 Station 28, St. John (2, E.5474). 



HEMIPHOLIS ELONGATA (Say) 



Localities. — Smithsonian-Hartford station 19, Puerto Rico (3, 

 E.5473) . Station 20, Puerto Rico (1, E.5593) . 



OPHIOSTIGMA ISACANTHUM (Say) 



Locality. — Smithsonian-Hartford station 17, Puerto Rico (1, 

 E.6448). 



