MOLLUSCA. 497 
Guppy, l.c. p. 441, and Proceed. Scientif. Assoc. Trinidad, 1868, p. 246, 
Trinidad. 
Helicina carinata (Orb.). Some remarks on specimens from the inland 
region of Rio Grande do Sul, by Martens, Mai. Bliitt. xv. p. 184. 
Helicina orhicidata (Say), Tennessee, Mississippi, Georgia, Alabama, Flo- 
rida, Texas; occulta (Say), recent in Wisconsin, Western Pennsylvania, and 
Virginia, posttertiary in Indiana, Ohio, &c. ; hanleyana (Pfr.), Now Orleans; 
chrysochila (IBinney), Texas and Mexico; subglobulosa (Poey), Florida at Key 
IBiscayne. Tryon, Am. Journ. Conch, iv. p. 13, pi. 1. figs. 17-26. 
SOLENOCONCIIiE. 
DENTALIIDiE. 
Jeffreys proposes to call the thread-like and extensile organs by which 
these mollusks seize their prey captacula, instead of tentacula, as they are 
unlike the tentacles of any Gastropod. Ann. & Mag. Nat. Hist. ii. p. 299. 
The Mediterranean species are enumerated by Weinkauff, Conch, des Mit- 
telm. ii. pp. 417-422, as follows : — Dentalium tarentmtwi (Lam.) distinct from 
entalis (L.), which is not Mediterranean; JD. dentalis (L.) ; jD. novemcostatum 
(Lam.) ; ]J. riifescens (Desh.) ; Siphonodentalium quitiquangnlare (Forbes) ; 
and Dischides bifossus (Wood), Algeria, on muddy ground, in 6-10 fathoms. 
Dentalium entalis. Lingual dentition by Hogg, Transact. Roy. Microscop. 
Soc. xvi. pi. 13. fig. 76. 
CONOHIEERA. 
Tlie orders and families of Coiicbifera are arranged by Prof. 
Hincks (Canadian Journal of Industry, Science, and Art, Dec. 
18(57) as follows : — 
Ord. I. Asiphonida. Fam. Ostreidas, Mytilidce, AviculideB^ Dectinidce^ 
Arcades. 
Ord. II. Nayades. Fam. Mtdleridce, JEtlieriadce^ AnodontidcCj Trigoniadce^ 
Unionidce. 
Ord, III. Brachysiphonida. Fam. Chamidm (including Hippurites and 
Tridacna), Lucinidce, Cardiid(t, Cycladida;, Cyprinidce. 
Ord. IV. Macrosipiionida. Fam. Myadm (including Anatina)^ Solenidce, 
Mactridce, TeUinidcCy Vcneridce. 
Ord. V. Inclusa. “ Families not well determined. Gastrochcenidc^ and 
Pholadidce are generally recognized.” 
Tryon, Am. Joum. Conch, iv. p. 162, asks why the name Inclusa is sub- 
stituted for Pholadacea. We may reply that this division was established 
as early as 1817 by Cuvier, imder the French name Enfertnes, including Mya^ 
GastrocJiama, Solen, Pholas, Teredo, and Fistulana, whilst Pholadaires ” of 
Lamarck corresponds only to a subdivision. 
INCLUSA, Cuv. (Pholadacea, Ad.). 
Pholadid;e. 
Teredo philippii (Gray). Its identity with T. minima (Blainv.) is doubt- 
ful. Hidalgo, Journ. Conch, xvi. p. 28, 
