268 



BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



CHELONIBIA PATTJLA (Ranzani). 

 Plate 63, figs. 4, 4a. 



1818. Coronula patula RANZANI, Opuscoli Scientific!, vol. 2, pi. 3, figs. 25-28. 

 1822. Coronula flentulata SAY, Journal of the Academy of Natural Sciences 



of Philadelphia, vol. 2, p. 325. 

 1825. Coronula, dcnticula Say, GRAY, Annals of Philosophy, new ser., vol. 10, 



p. 105. 



1825. Astrolepas Items GRAY, Annals of Philosophy, new ser., vol. 10, p. 105. 

 1854. ChclonoUa patula Ranzani, DAKWIN, Monograph, p. 396, pi. 14, figs. 



3a, 3b, 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 crenulated 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 Limulus. The types of Say's Coronula 

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

 Philadelphia, are labeled Florida. The single specimen seen from 

 Port Townsend (presumably Washington) was without record of the 

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

 specimens collected by M. Bailleu, 187"). Ranzani'S type was from 

 the Adriatic, on a crab. 



Subfamily 



1825. Corontilaihr LEACH, Zoological Journal, vol. 2, p. 209 (exclusive of 



Chelonibia). 

 1854. Kccoinl sec-lion of ihe stilt family Balaninfe, DARWIN, Monograph, 



p. 397. 

 1905. Coronulincp and XenolxiJinihifr GRUVEL, Monographic des Cirrhipedes, 



p. 8. 



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

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



