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PACIFIC SCIENCE, VoL XVIII, October 1964 
ductor ridge, V. scrippsae resembles members 
of the V. alba group, but differs in the absence 
of riblets which terminate on the scutotergal 
margins of the scutum and carina. Verruca 
scrippsae also bears resemblance to members of 
the V. calotheca group, especially in the presence 
of large unribbed areas on the exterior of the 
movable scutum and tergum, and in the absence 
of short, curved ribs on the scutotergal margins 
of the rostrum and carina (i.e., V. entobapta 
Pilsbry and V, macani Stubbings). Verruca 
scrippsae is most easily distinguished from the 
V. nexa group by the vertical rather than in- 
flected basal margin of the shell wall, and by 
the marginal rather than submarginal apex of 
the rostrum. The sharp basal edge of the shell 
wall, and the presence of well-defined articulat- 
ing ribs between rostrum and fixed scutum and 
carina and fixed tergum in V. scrippsae suggest 
affinities with the shallow-water V. stroemia 
group. In these two features V. scrippsae differs 
from members of the "deep-water” groups. 
suborder BALANOMORPHA Pilsbry 
family BALANIDAE Gray, emended 
subfamily Balaninae Gray, emended 
genus Balanus Da Costa, 1778 
subgenus Solidobalanus Hoek, 1913 
S olid o -Balanus Hoek, 1913, S*£ogtf-Expeditie, 
mon. 31b, p. 159. 
Solidobalanus Hoek. Pilsbry, 1916, U.S. Nat. 
Mus. Bulk 93, p. 220. 
Balanus ( Solidobalanus ) nascanus Zullo, sp. 
nov. 
Figs. 5 A-K 
Dimensions of holotype UCMP 37855: height 
of shell, 2.5 mm; carinorostral diameter of base, 
3 mm; greatest lateral diameter of shell, 2 mm; 
carinorostral diameter of orifice, 2 mm. 
Shell high conic or cylindric; holotype UCMP 
37855 (Fig. 5 A) and paratype ucmp 37858 
small, elongate along carinorostral axis, with 
deeply concave basis resulting from attachment 
on gorgonians; specimen on shell of Sip bo sp. 
(UCMP paratype 3785 6) larger, up to 6 mm in 
height and basal diameter, with flat basis and 
nearly circular basal outline; dried specimens 
colored white or mottled orange; parieties 
smooth or longitudinally plicate;- exterior of 
parieties and radii covered by adherent, buff- 
colored epidermis; orifice large, moderately 
toothed, diamond-shaped; radii thick, wide, with 
irregularly crenulated sutural edges; surface of 
radii glossy with distinct, regularly spaced, trans- 
verse striae; summits of radii oblique, about 30° 
from plane of orifice; alae thick with indistinctly 
crenulated sutural edges; summits of alae ob- 
lique, convex, projecting above radii; parieties 
solid, ribbed interiorly near the basis, the ribs 
fading about half-way to the sheath; base of 
parieties with sharp ribs for attachment to basis; 
sheath from one-fourth to one-half length of 
compartmental plate, without space beneath 
lower edge; basis solid, thickened on periphery; 
periphery furnished with denticulae for articu- 
lation with compartmental plates; inner surface 
of basis with distinct radial ribs. 
Scutum (Figs. 5 B, C) white, externally orna- 
mented by shallow, regularly spaced grooves 
separating flat growth increments; alternate in- 
crements forming sharp, sinuous teeth on oc- 
cludent margin; growth increments ornamented 
by indistinct, closely spaced, radial striae; oc- 
cludent margin straight; tergal margin concave, 
reflexed almost 90°; basal margin sinuous, 
shorter than tergal margin; surface of scutum 
concave exteriorly; articular furrow broad, shal- 
low, and finely denticulate; articular ridge long, 
four-fifths length of tergal margin, erect, and 
high, especially in lower half; no adductor ridge; 
pit for adductor muscle small, oval, shallow, 
situated near occludent margin; pit for lateral 
depressor muscle small, deep; lower fourth of 
occludent margin inflected, forming small pit in 
basioccludent angle. 
Tergum (Figs. 5 D, E) narrow, almost twice 
as long as broad; color white; apex not produced; 
exterior ornamented by closely spaced growth 
lines which are finely striate on either side of 
spur fascicle; spur fascicle delimited by im- 
pressed grooves on either side; spur narrow, 
about as long as wide, terminating in rounded 
point; spur close to but distinct from basiscutal 
angle, and curving with only a slight break into 
the basal margin on the carlnal side; scutal mar- 
gin straight, reflected 90 °, denticulate in some 
specimens; carlnal margin convex, delimited by 
