268 BULLETIN 93^ UNITED STATES NATIONAL MUSEUM. 



CHELONIBIA PATULA (Ranzani). 



Plate 63, figs. 4, 4a. 



1818. Coronula patula Ranzani, Opiiscoli Scientifici, vol. 2, pi. 3, figs. 25-28. 

 1822. Conmnla (Icntulnta Say, Joiirnal of the Academy of Natural Sciences 



of Philadelphia, vol. 2, p. 825. 

 1825. Coronula denticula Say, Gkay, Annals of Philosophy, new ser., vol. 10, 



p. 105. 

 1825. Astrolepas Jcevis Gray, Annals of Philosophy, new ser., vol. 10, p. 105. 

 1854. Chelonobia patula Ranzani, Darwin, Monograph, p. 396, pi. 14, figs. 



3a, 3?>, 4. 



Distribution. — Mediterranean and both sides of the Atlantic in 

 tropical and subtropical waters; Australia; Japan. 



The pale buff or nearly white shell is very light and fragile in 

 contrast with the preceding species. The outer lamina of the wall is 

 thin, the radiating septa are thin, with delicately crennlatod edges. 

 The interseptal pores are not filled up, but penetrate to the summits 

 of the parietes. The lower edge of the sheath is reduced to mere 

 pillars. The opercular valves are somewhat narrower than in the 

 other species. Greatest diameter 22 mm., height 8 mm. 



All of the specimens I have seen attached and others bearing data 

 are or were seated on crabs or TJmuIus. The types of Say's Coronula 

 dentulata,f in the collection of the Academy of Natural Sciences of 

 Philadelphia, are labeled Florida. The single specimen seen from 

 Port To^vnsend (presumably Washington) was without record of the 

 collector. It has been reported by Gruvel from the Hawaiian Islands, 

 specimens collected by M. Bailleu, 1875. Ranzani's type was from 

 the Adriatic, on a crab. 



Subfamily CORO]SrXT3L,IN"JE. 



1825. Coronuladw Leach, Zoological Journal, vol. 2, p. 209 (exclusive of 



Cliclonihia) . 

 1854. Second section of the siibfamil]/ Balanina', Darwin, Monograph, 



p. 397. 

 1905. Cororivlinw and Xenohatdnimr Oruvkt,, IMonographie des Cirrliipedes, 



p. 8. 



Compartments six. Scutum and tergum, wdien present, not over- 

 lapping or articulated together; the terga or lioth scuta and terga 



