194 MESSRS. J. C. MELVILL AND B. STANDEN ON 



many so-called " species " were described in the earlier years of 

 this century by Lamarck, Deshayes, and others, that much con- 

 fusion naturally exists, and we should not be surprised if some 

 future monographer were not only to merge this with L. tigrina. 

 Lam., and L. Soiverhyi, Desh., but also make more sweeping 

 reforms still. 



Station 5, Boydong Cays. 



368. LiocoNCHA piCTA, Lam. 

 Station 14, Mer. 



369. PiTAE EEGULAEis, Siuitli (as Caryatis). (' Challenger ' 

 Eep. vol. xiv. pi. i. figs. 3-3 i.) 



Pitar, E-omer, has priority o£ five years over Caryatis of the 

 same author. 



370. ClECE CASTEENSIS, L. 



Station 2, "Warrior Island ; Station 5, Boydong Cays ; Station 

 4, Ormans Eeef. 



371. ClECE PECTINATA, L. 



We believe that it will be found that the Circe (or Crista) 

 pectinata, L., and C. gibhia, Lam., are the extreme forms of one 

 variable species. Gibbia, as its name would imply, is the large 

 swoUen-valved shell, coarsely longitudinally nodulous-costate ; 

 whilst normal forms of pectinata are flatter, simply oblong, and 

 the nodules, though present, hardly developed. Gibbia, again, is 

 as a rule colourless, with the exception of a dark bluish^brown 

 variegation posteriorly ; while pectinata is, in all examples we 

 have seen, more or less flecked throughout with zigzag brown 

 markings. The distribution of both species is much the same, 

 and embraces the whole of the tropical East Indies. 



Station 14, Mer ; Station 5, Boydong Cays. 



372. Circe rivularis. Born. 

 Station 5, Boydong Cays. 



373. DosiNiA c^EULEA, Bvc. 



374. DosiFiA HisTRio, Gmel. 



It is common and variable in the Arabian Sea and Persian 

 G-ulf (Totvnsend) ; Andamans (Booley) ; Madras and S. Indian 

 Ocean (Senderson) ; Cejlon (^Layard), &c. A variety from 

 Murray Island is the D. lyrafa, Sow. 



