MOLU'SC'A, I. SMITH. 103 



antemedian. approximated, Init not quite touching : interior of tlic valves showing- 

 traces ut tin- external sculpture, white, rather glossv : hinge normal, somewhat 

 delicate : anterior aililuetor impression narrowlv pyrifbrm, posterior larger, round : 

 pallia! sinus long, rounded at the end, extending aliout halt'-\va\- across the 

 valves. 



Length. :! I nun. : height. 20 : diaineter. 1 _'. 



Station 42, oti' Kio de Janeiro : 40 fathoms. 



.)/. in/>/u."t,t. Deshayes.* tVoin I'aiiaina, is rather like this species, Imt is flatter, not 

 so trigonal in shape, being broader at the anterior end. The plica- on the uinliones 

 are less developed, and the hinge is rather more delicate. 



'28. Mhcrocallista maeulata (Linnaeus). 



VI-HIIS maeulata, Linn., Svst. imt., i-<l. X, ]>. liMi. 



I" 'tuts (Cytherea, Callista) iiinmlntu . linnicr, Monog. Venn*, i'tillix/n. p. Id. ],|. XVI, Hi;--. I 1< . 



Station 42, oft' Rio de .laneiro : 40 fathoms. 



Only one small valve obtained. 



For references and synonymy see Romer and Dall.f A verv common West 

 Indiiiu shell, and already recorded by d'< >rbigny from l!io de Janeiro. 



The late Mr. Jukes-Browne (Proc. Malac. So,-., vol. X.. p. :!44) upheld the use of 

 the genus Callixta of Poli as restricted by H. and A. Adams in 1857. but as pointed 

 out by Dall this name of I'oli's had already in 1852 been applied to quite a ditl'ereut 

 group of Veueridse. 



Mr. Jukes-Browne's argument (I.e. p. 336) upon this subject appears to me 

 unconvincing, and I fail to see that in this instance " the rule of priority is breaking 

 down from the shear weight of absurdities." etc. 



29. I 'i tnrin roxfnitu (Koch). 



<'iiiln;;;i ,;,K/i-iitn, Koch, in Philippi's Ablnld., vol. I, p. 1 .">(>, pi. I, fig. 3 (1- S 44). 



Station 42. off Uio de Janeiro : 40 fathoms. 



For synonymy, references, and some remarks, see Smith. "Challenger" 

 Lamellibranchiata, p. 137. Only a number of odd valves were obtained at tin- 

 above station. They are rather longer in proportion to the height than the tvpical 

 form figured by 1'hilippi. and the pallia! sinus is wider and not so pointed. 



Length of largest specimen. 33 mm. ; of Koch's tvpe, 39 mm. Height of large.-i 

 specimen. 2(> mm. ; of Koch's tvpe. .">(! mm. 



* RCCM-'S ('i)iich. Iron., vol. VIII, tig. !i:i. 



t Trans. Wagner lust. Sri. I'hilail.. vol. 111. |>. I2f'6 (1903). 



