372 



^Ir. Vj. a. Siniili on the Genera 



Mesalia iiitermfJiu (Desliayes) 



I 



1832. Tiinifella intermedia, Doshayes, Coq. foss. Environs Paris, vol. ii. 



p. 28'^, 1)1. xxxvii. W^s. 17, 18, pi. xx.vviii. iigs. 3, 4. 

 1888. Turritella rohn^ta, iSowerbv, I'roc. Zool. Sec. p. 211, pi. xi. 



fiff. 18. 



1 liave included this Pari.s Ba.sin fossil in tliis list to call 

 attention to tlie fact that the shell described a.s recent by 

 ]\Ir. Sowerby is merely a well-preserved and nicely cleaned 

 specimen ot Deshayes's .sj>ecies. 



I perceived at a glance it was quite distinct from Turri- 

 tella, and it occurred to me it miiiht be an extinct form, 

 since it was so unlike any known living species. I therefore 

 submitted it to Mr. R. Hullen Newton, who at once identified 

 it with this species, lie kindly phiced a series of specimens 

 at my di.-3posal for coini)arison and, consen[uentl3', I am in a 

 position to confirm his determination. Mr. vSowerby's type, 

 now in the British Museum, was, as might be expected, 

 described without a locality. 



The figure of it is very crude and inaccurate, the whorls 

 being represented too narrow and too convex, and contracted 

 at the lower part. The labrum being broken b;ick some- 

 what givfs t!ie mouth a rounder look than in perfect speci- 

 mens, and the anterior or ba-ial sinus is less apparent. 



TuURITELLOrSIS, Sars. 



1878. Turritellnpsis, Sars, Moll. Reg, Arct. Norveg. p. 186 (shell and 



radula tiguied). 

 1885. Turriielhpsis, Fiscber, Mau. Conch, p. 694, as subgenus of 



Turrifel/d. 

 1883. Turrifelhpsis, Tryon, Struct. Syst. Conch, vol. ii. p. 224, pi. Isvii. 



tig. 56 (shell). 

 1897. Ttirritellopsis, Ivobelt, Conch. Cab., Turritella, p. 67, pi. xx. 



figs. 10, 1 1 (shell ), regarded as a distinct genus. 



This genus in form and sculpture is very like Turritella^ 

 but differs in repard to the character of the raduia. The 

 opeiculum is circular, multispiral, with central nucleus. 



Turritellopsia acicida (Stimpson). 



1851. TtirriteUn acicula, Stimpson, Proc. Boston Soc. Nat. Hist. 



vol. iv. p. 15. 

 IHol. Turritella acicula, id. Shells of New England, p. 35, pi. i. 



fig. 5. 



1870. Turritella acicula : Gould, Invert. Massachusetts, ed. 2, p. 319, 

 fig. 588. 



1871. Mesniia acicula : Dall, Amer Journ. Conch, vol. vii. p. 118. 

 1878. Turritellopsis acicula : Sars, Moll. Reg. Arct. Norveg. p. 180, 



pi. X. figs. 14, a h ; radiila, pi. vii. tigi?. 2, a~e. 



