74 BULLETIN 76, UNITED STATES NATIONAL MUSEUM 



The four suboral spines, similar in all respects to the adambulacrals, are close to the 

 furrow margin in a sort of arcuate series. (PI. 30, fig. lb.) 



I can find no straight pedicellariae. The crossed pedicellariae (pi. 30, figs. Id, 

 le) are from 0.28 to 0.34 mm. long and are similar in general form to those of 

 coscinadis but have usually fewer teeth in the vertical series of each jaw (six to 

 eight as a rule). The adambulacral and oral plates and spines are entirely devoid of 

 pedicellariae. 



Madreporic body small, about two-thirds distance from center of disk to supero- 

 marginals at interradius. 



Anatomical notes. — The gonads open just ventral to the inferomarginal plates, 

 2.5 mm. from the interradial angle. Each ovary is a small globular mass. The skele- 

 ton of each interradial angle is continued internally as a slight septum or buttress. 

 The ampullae are single and the tube-feet strictly biserial. 



Type.— Cat. No. E. 1422, U.S.N.M. 



Type-locality.— Station 2951, south of Santa Cruz Island, Calif., 33° 55' 30" 

 N., 119° 55' W.; 48 fathoms, fine gray sand; 1 specimen. 



Distribution. — Known only from the type-locality. 



Remarks. — This species is readily separable from coscinadis by reason of the 

 notably smaller mouth plates, larger combs of adambulacral spines, absence of straight 

 pedicellariae, wider intermarginal space, and the presence of incipient interbrachial 

 septa. The crossed pedicellariae have slightly fewer teeth in the vertical series of 

 each jaw. The rays are considerably stockier than in coscinadis. Whether the absence 

 of abactinal papulae from the rays is really characteristic of the species or only a 

 specimen peculiarity can not be determined. Since the same peculiarity is found in 

 nannodes, I believe it is an important character. 



The station number may not be correct, as the depth recorded is much less than 

 usual for this genus. 



ANTELIASTEK MICROGENYS NANNODES, new subspecies 



Plate 29, Figures 3, 3a-3d; Plate 35, Figure 4 



Diagnosis. — Differing from A. microgenys in having fewer, slenderer adambu- 

 lacral spinelets, slightly different crossed pedicellariae, and in having, sometimes, 

 oral, spatulate straight pedicellariae of conspicuous size. R 17 mm.; r 3.5 mm.; 

 breadth of ray at widest part, 4 mm.; R = 4.8 + r. 



Description. — The skeleton is very similar to that of microgenys, but on account 

 of the small size of the specimen the intervals are smaller. There are two more or 

 less interrupted dorsolateral series of meshes separated by the A and Y dorsolateral 

 plates, but very few intermediate ossicles are present. As in microgenys there are 

 no dorsal papulae except a few on disk. The intermarginal ossicles are developed 

 proximally so that even in such small specimens the two series of marginal plates are 

 well separated. A single longiseries of actinal plates, and above them one of papular 

 areas, extend nearly to the middle of ray. Each intermarginal and actinal area 

 contains one papula. 



The spinelets are very small, rather thick, tapered, and end usually in three or 

 four points. They stand one to a plate, are 0.26 to 0.35 mm. long, and are well 

 spaced, but the intervals are filled with pedicellariae which resemble those of micro- 



