THE BARNACLES IN THE U. S. NATIONAL MUSEUM. 101 



segment (fig. 34^1. 13th and llth segments of outer ramus, cirrus vi, 

 11. ptrearh^ata, tj^pe of the subgenus Paralejxis). 



The armature of the cirri in Paralepas is much like that of Alepas, 

 but the whorls of spines are more broadly interrupted on the sides 

 of the cirri, and the cirri themselves are much better developed. 

 Moreover, caudal appendages are well developed in Paralepas., com- 

 posed of several segments, as in Ileteralepas., while in Alepas ihej are 

 wanting or composed of a single short segment. 



Ileteralepasi^Paralejxis) pedmicnlata Hoek, reported as taken b}^ the 

 Challenger at Station 164 A, off Sydney, New South Wales, on a spine 

 of Phonnosoma liojplacantha Agassiz, is probably not from Australian 

 waters, but from a mid-Atlantic station. See under Megalasma gntclle, 

 p. 89. Ileteralepas {Paralepas) minuta (Philippi) is in tlio Museum 

 from the Zoological Station at Naples. 



The following forms have been described from Antillean waters: 



Heteralepas eornuta (Darwin), St. Vincent. 



Heteralepas lankesteri (Gruvel), Mona Channel. 



Heteralepas heUi (Gruvel). coast of Cuba. 



HETERALEPAS CYGNUS, new species. 



Type.—Q.2X. No. 32920, U.S.N.M. 



Type-locality. — Monterey, California, Ward's Natural Science 

 Establishment. Depth and nature of support unknown. 



The capitulum is oval, its width about three-fourths of the length, 

 not much compressed, the diameter being about half of the length; 

 distinctly differentiated from the peduncle, strongly keeled dorsally, 

 integument transversely wrinkled, without hairs or bristles. The 

 orifice is ovate, somewhat exceeding one-third the length of the 

 capitulum. The occludent margin below the orifice is convex. 



The peduncle is ver}^ long, about three times the length of the 

 capitulum, cvlindric, conspicuously^ wrinkled transversely, widest near 

 the base, tapering slowly to about two-thirds the greatest width at the 

 neck where it joins the capitulum. Along its dorsal side a low ridge 

 continues the keel of the capitulum. 



The color is light j^ellow, sometimes a shade darker, slightly brown- 

 ish, on the peduncle. 



Length of capitulum 23, breadth 18, diameter 12.5 mm. Length of 

 the peduncle 7o nnu.. breadth near the base 12.5, near the capitulum 

 8 mm. (Fig. 35.) 



The mandible (Plate V, fig. 8) has four strong subequal teeth, the 

 lower three equalh' spaced, the upper one separated by a space nearly 

 twice the width of the others. There is a brush of fine hairs on the 

 upper edge, another on the lower. 



The maxilla (Plate Y, fig. 7) has the border excavated bolow the two 

 large spines at the upper angle, tlie embayment armed with but few 



