GENUS TINOPOEUS : — HISTOET. 
557 
The extension of spines from the whole surface of the disk, in the mode represented in 
Fig. I. A, may in lik e manner be regarded as a sort of “ running-wild ” of the supple- 
mental skeleton. 
Genus Tinopoeus. 
208. A more remarkable example could scarcely be adduced, of the necessity of a 
thorough examination of the internal structure of the skeletons of Foraminifera as a 
guide to the determination of their true affinities, and of the danger of relying upon 
external characters alone, than that presented by the type I am next to describe under 
the name Tinoporus ; certain forms of which present so strong a superficial resemblance 
to many specimens of Calcarina, as to be unhesitatingly associated with them by every 
one who has not had his attention directed to the minute features of difierence they 
present; whilst the plan on which it is constructed will be found to be essentially 
diverse. 
209. History. — My reason for adopting this name is as follows. In the ‘ Conchyliogie 
Systematique ’ of Dexys de Montfoet (Paris, 1808), there is described and figured* 
under the name of Tinoporus baculatus a small polythalamous body, which he seems to 
have distinguished from the other varieties of Nautilus {Calcarina) Spengleri figured by 
MM. Fichtel and Moll, partly by the fewness of its spines, and partly by the difierence 
of its structure as displayed in vertical section. And although his figure and description 
are alike inaccurate (the former, as has been pointed out by Messrs. W. K. Paekee and 
T. E. Jones f, being partly drawn from specimens of Calcarina), yet as I can scarcely 
doubt that he had before him a specimen of the type I am about to describe, I think 
it right to retain the distinctive designation he conferred upon it. The following is 
De Montfoet’s characterization of the genus : — “ Coquille libre, univalve cloisonnee 
et cellulee, spiree et lenticulaire ; tet granule exterieurement ; bouche semi-lunaire, 
placee vers la circonference et sur un des cotes ; dos carene, arme de quatre pointes au 
plus; les deux centres bombes et releves.” Of the species T. haculoMs., which served 
as his type of the genus, and of which he gives the fourth variety of the Nautilus 
Spengleri of Fichtel and Moll as a synonym, he says : — “ Cette coquille, qui pour nous 
est la tete (type V) d’un genre nouveau et assez nombreux, ressembleroit a la nummulie 
ou camerine tuberculee et criblee, si elle n’etoit armee de trois pointes obtuses. Ces 
pointes sent interieurement sillonees et tuberculees a la maniere de quelques tubipores : 
la bouche de la coquille, placee sur un des cotes, est tres remarquable, en ce qu’elle est 
petite et formee en demi-lune : la spire est cachee et interieure. Les auteurs allemands 
que nous avons cites dans notre synonymie, y compterent au moins quatre-vingts cellules. 
Nous avons fendu cette coquille a demi par le milieu, afin de faire apercevok la con- 
struction de I’interieur, qui, cellulee sur divers plans, nous conduit naturellement aux 
nummulies, mais elle en differe par ses bras ou pointes, qui sent constans, quoique leur 
* Tome i. p. 147. 
t Annals of Natural History, Series 3. vol. vi. p. 34. 
