THE SESSILE BARNACLES. 



265 



tudinally, and there are no incisions or lobes in the periphery, un- 

 less the two varieties placed under C. manatl belong to this species. 



There seems to be but little racial differentiation in C. testudlnaria, 

 tlioiigh very large series might show more than I can see at present. 

 The Atlantic specimens, as a general rule, have fewer and coarser 

 transverse sutural ridges than those of the Pacific. Rarely they are 

 almost obsolete. When old the wall is usually higher, especially the 

 rostrum, which has a more arched profile; but this is not obvious in 

 smaller examples. The basal septa are often, but not always, thicker. 

 The orifice is sometimes longer, but varies from about one-third to 

 nearly one-half the total length. A specimen of about the maximum 

 size reached on our coast measures 48 mm. in carinorostral diameter, 

 hciglit IS mm. (pi. Gi^, fig. 2). 



The only one I have seen from the Galapagos is very large and 

 low, 78 mm. long, 19 mm. high. The body-chamber is less than half 

 of the basal diameter (pi. ()2, fig. 1). A similar specimen GO mm. 

 long was taken in San Bartholome Ttay, Lower California. 



In the Gulf of California and at Cape St. Lucas there may be a 

 small race. At all e\ ents, in three lots, about 25 specimens, the maxi- 

 mum length is about 28 mm. (pi. 62, fig. 3). In these, and all west 

 American specimens seen, the transverse ridges in the radii are 

 nari'ower and sliglitly more numerous than in Atlantic examples. 



Locality. 



Collector. 



l-Jotus. 



l^cw-port, R. I 



Point Pleasant, N. J.' 



Delav.are Bay,N. J.i 



Beaufort, N.C.I 



East Coast of Florida 



Pcnsacola, Fla 



Key West, Fla 



Progreso, Vucatan ' 



Foint Patuca, Honduras 



Cape Frio, Brazil 



Albemarle Island, Cialapagos. 

 Gulf of CalJIornia 



Dr. Edgar .V. Mi>arns. 



Wil iner Stone 



H.J.Mitchell 



L. R. Gibbes 



F. E. Spiimer 



Silas Stoarns 



A Watross 



Heilprin expedition . . . 

 W.H.SIigh 



On loggerhead. 

 On turtle. 



On loggerhead. 

 Do. 



Stanford University. 



San Luis Gonzalez Bay, Gulf of California. . 



Cape St. Lucas, I,o\ver California 



SlagdaleJia I'.ay , Low er Califuniia 



San Barlholonio Bay, Lower California 



Hawaiian Islauds 



Pearl Harbor, Oahu 



Carolina Island, Ceatral Pa<,ific ' 



Ana, Japan 



Do 



Albatro-is 



C. R.Orcutt 



Albatross 



Win. Alanson Bryan. 



Albatross 



C.D.Voy 



H. Loomis 



On turtle; diameter 28 mm.; 

 largest 29 mm. diameter. 



Diameter 27J ram. 



Up to CS mm. diameter. 



■ Specimens in the collection of the Academy of Natural Sciences of Pliiladelphia, the records inserted 

 here to show its occurrence in the Middle States, etc. 



CHELONIBIA MANATI Gruvel. 



1903. Chelonohia manati Gruvel, Nouvelle Archiveig du Muf5eum d'Histoire 



Naturelle, ser. 4, vol. 5, p. IIG, pi. 2, figs. 14, 17, 18; pi. 4, figs. 15, 16. 



1905. Chelonohia manati Gruvel, Monographie des Cirrhipedes, p. 267, fig. 



2r)7?>. 

 r?/;><^.— Museum d'Histoire Naturelle de Paris, from the Congo 

 coast, abundant on skin of Manatus senegalensis. 



