304 



BULLETIN 93, ITISTITED STATES NATIONAL MUSEUM. 



It appears, then, that this typical form of the species is known 

 from the Mediterranean, Madeira, and the Azores; whether it 

 occurs in northern Europe is still uncertain. 



Darwin figures (pi. 18, fig. Ih) a peculiar form which I ha^e not 

 seen, from St. lago, Cape Verde Islands. 



Northern Europe. — Form punetatus Montagu (pi. 71, figs. 2-25, 

 3, 3(z) . In English specimens there is a good deal of variation from 

 the characters given above. The external form is often ty]5ical, 

 as in plate 71, figures 3, 3«, from Exmouth; but when crowded tlicy 

 become cylindric, as in plate 71, figures 2, 2«, 2&, exceedingly like 

 the cylindric form of Balanus halanoides. This tubular form is 

 what Professor Gruvel has called var. fstulosus. Tliere are many 

 transitional specimens between the tubular and the depressed forms, 

 in the same groups. 



The scutum, in all of the English examples I have closely exam- 

 ined, is longer than in the Mediterranean form, with the apical angle 

 acute, the tergal margin shorter, and the adductor muscle pit smaller. 

 The tergum also differs by having a sinuation in the basal margin 

 near the depressor muscle crests. I have not taken time to compare 

 large series — the cleaning is somewhat tedious — ^but according to 

 Darwin these characters of the valves vary so much that he included 

 all of them in var. communh. If the form in question proves to be 

 racially distinguishable from typical stellatus it will be called punc- 

 tatiis Montagu. Eroded specimens usually have a punctate or pep- 

 pered appearance. My plate 71, figures 2-25, 3, 3«, and Darwin's 

 plate 18, figure 1<?, are from British specimens of this race. 



U.S.N.M. 

 Cat. No. 



Locality. 



Collector. 



Notes. 



12066\ 

 1209S/ 

 12108 

 1214S 

 12095 



England (?) 



do 



Exmouth, England . . . 



England(?) 



Fayal, Azores 



Port Cuyo, Hiilippines 



„, , . , ™ „ n *• , fOn Patella vuljata and on 

 Clark, m Jeffreys collection . . •! ^y^j^g 



Jellreys j ■ 



do 



do I Tubular variety. 



Lewis Dexter 



A Ibatross 



Not typical . 

 mitelia. 



CHTHAMALUS STELLATUS DEPRESSUS (PoH). 



1791. Lcpafi ilcprcsHa Poli, Testacea lUriu.sque SiciluTe, voL 1, p. 27, pL 5, figs. 



12-17.' 

 1818. Chthamahis glahcr Ranzani, Opuscoli Scientifici, voL 2, p. 83, based upon 



Lepas depressa Poli. 

 1854. Chthamahis steUatus var. depressus Poli, Darwin, Monograph, pi. IS. 



fig. 1& (locality not given), Ig (Mediterranean). 



iThe name Lepas depressa has page priority over L. sicUata, hut subsequent authors 

 have preferred the latter, depressa being a far less common and local form. 



