370 
PACIFIC SCIENCE, Vol. XVIII, October 1964 
Species of the subgenus Solidobalanus, being 
for the most part restricted to subtidal depths, 
are known by relatively few individuals, and as 
a result little information is available concern- 
ing the range of variation of the characters 
which are presently considered significant at the 
specific level. Future collections, especially from 
the Pacific, may indicate that the characters used 
in separating such geographically widespread, 
morphically similar species as Balanus auricoma, 
B. haivaiensis, and B. nascanus are variable, and 
that these three species, and perhaps others, 
may be merged into a single species. At the 
present time, however, it would appear more 
prudent to differentiate the eastern Pacific so- 
lidobalanid by establishing a new species. 
SUMMARY 
Representatives of four new species of tho- 
racic cirripedes were obtained in a dredge haul 
at 228 m depth on a guyot on the southwest 
end of Nasca Ridge about 1280 km off the coast 
of Chile. 
1) Megalasma elegans Newman, sp. nov., is 
related to M. striatum Hoek, but differs 
in the absence of the beaded ridge extend- 
ing from below the scutal umbones across 
the scuta and carina to the carinal um- 
bones; in the form of the trophi; and in 
the presence of pinnate setae on the cirri 
and plumose spines on the caudal ap- 
pendage. 
2) Heteralepas mystacophora Newman, sp. 
nov., is remarkable for the presence of 
numerous soft setae clothing the bullate 
portion of the labrum. 
3) Verruca scrippsae Zullo, sp. nov., resem- 
bles members of the shallow-water V . 
stroemia group in the sharpness of the 
basal edge of the shell wall and the pres- 
ence of well-developed articulating ridges 
between rostrum and fixed scutum and 
carina and fixed tergum, but differs in the 
more slender cirri, longer caudal appen- 
dage, and low adductor ridge. 
4) Balanus ( Solidobalanus ) nascanus Zullo, 
sp. nov., is related to B. hawaiensis Pils- 
bry, but can be distinguished by the nar- 
rower tergum with a longer tergal spur, 
and by the presence of radial striae on 
the scutal exterior. 
Megalasma, Solidobalanus, and the "deep- 
water” verrucids have not been reported pre- 
viously from the eastern Pacific. 
REFERENCES 
Annandale, N. 1905. Malaysian barnacles in 
the Indian Museum, with a list of the Indian 
Pedunculata. Mem. Asiatic Soc. Bengal 1(5): 
73-84, text figs. 1-3, pi. 8. 
1906^. Report on the Cirripedia col- 
lected by Professor Herdman, at Ceylon, in 
1902. Rept. Govt. Ceylon on Pearl Oyster 
Fisheries of Gulf of Manaar, 5 Suppl. Repts. 
31: 137-150, text figs. 1-9. 
190 6b. Natural history notes from the 
R.I.M.S. Ship "Investigator,” Series III, No. 
12. Preliminary report on the Indian stalked 
barnacles. Ann. Mag. Nat. Hist. (7)17:389- 
400. 
1907-1908. Illustrations of the Zoology 
of the R.I.M.S. Ship "Investigator.” Crustacea 
Entomostraca. 1907: Pt. 1, pis. 1-2. 1908: 
Pt. 2, pis. 3-4. 
1909. An account of the Indian Cirripe- 
dia Pedunculata, Pt. I. Family Lepadidae (s. 
str. ) . Mem. Indian Mus. 2 (2): 51-137, text 
figs. 1—11, pis. 6-7. 
Aurxvillius, C. W. S. 1894. Studien fiber Cir- 
ripedien. Kongl. Svenska Vetensk.-Akad. 
Handl. (4)26(7) : 1-107, pis. 1-9. 
Barnard, K. H. 1924. Contribution to the 
crustacean fauna of South Africa, no. 7. Cir- 
ripedia. Ann. S. Afr. Mus. 20(1): 1-103, pi. 1. 
1925 . Report on a collection of Crusta- 
cea from Portuguese East Africa. Trans. Roy. 
Soc. S. Afr. 13:119-129, 2 pis. 
Borradaile, L. A. 1903. The barnacles (Cir- 
ripedia). In: The fauna and geography of the 
Maidive and Laccadive Archipelagos, edited 
by Gardiner, 1:440-443. 
Broch. Hj. 1922. Papers from Dr. Th. Morten- 
sen’s Pacific Expedition 1914-16, X. Studies 
on Pacific Cirripeds. Vidensk. Meddel. fra 
Dansk naturhist. Foren. Kpbenhavn 73:215- 
358, text figs. 1-77. 
1931. Papers from Dr. Th. Mortensen’s 
Pacific Expedition 1914-16, LVI. Indoma- 
