THE SESSILE BARNACLES. 



77 



Bay measures 20 cm. long, 8.3 cm. in greatest diameter. One from 

 Talcalmano Bay measures 18 cm. long, 8.5 cm. diameter. 



A specimen from Pacasmayo, Peru,^ differs from these by being 

 much thinner, and the basis is longer, forming about two-thirds of 

 the height. Length 16 cm.; greatest diameter 6.2 cm. 



BALANUS MAXILLARIS Gronovius, 



1763. Balanus mazillaris Gronovius, Zoophylacii Gronoviani, IconograpMa sive 



Tabularum Explicatio, vol. 5. pi. 19, figs. 3, 4. 

 1790. Lepas cylindrica Gmelin, Systema Naturae, p. 3213. 

 1854. Balanus capensis Ellis, Daravin, Mouogi'aph, p. 209, pi. 2, figs. 4a, 4b. 



Distribution. — Cape of Good Hope (Algoa Bay and Lagulhas 

 Bank). 



Cat. No. 3596, Cape Town, U. S. Expl. Exped.; young specimens 

 only. 



Ellis, who is usually given as the authority for the species capensis, 

 did not make the slightest attempt to use the Luuisean system of 

 nomenclature and certamly can not be quoted for specific names. 



BALANUS DECORUS Darwin. 



1854. Balanus decorus DAR'mN, Monograph, p. 212, p. 2, figs. 6a, 66. 



Type. — British Museum, from New Zealand. 



Wanganui, New Zealand. S. H. Drew. Chatham Islands, New 



Zealand, Dr. E. Kershner. 



As the opercular valves arc wanting, the identification is not 



positive. 



Subgenus BALANUS Da Costa. 



= Balanus + Tamiosoma Conrad, 1856 + Ortho-Balanus Hoek:, Siboga-Expe- 

 ditie, Monographie, 316, 1913, p. 158, B. amphitiite here selected aa type. 



Balani in which the parietes but not the radii are porous; basis 

 calcareous, either solid or porous; cirrus iii (and sometimes iv-vi) 

 armed with teeth or spinules. 



At one time I thought that Hoek's subgenus Ortlw-Balanus could be 

 maintained for the species with porous basis, Darwhi's Section C; 

 but it is clear that B. nubilis and B.Jlos, which have the basis incom- 



1 Figured in Proc. U. S. Nat. Mus., vol. 37 pi. 10. flg. 1. 



