KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 19. N:0 4.' 49 



Nodos.iriiia crepitliiL'i var. cassis F. & Moll. 



Tab. III, li<?ff. 50-51. 



-'oö- 



Sometirnes this variety differs a great deal from the typical N. crepidula. It 

 bears the same relation to this as the knobbed and spine-margined variety of Nod. 

 calcar to its typical form. It is of course in vain to attempt to make a clear distinc- 

 tion between this variety and even Nod. calcar, as is best understood by d'ORBiGNy's 

 representation of it in his For. bass. tert. de Viejine t. 4, fig. 5, which shows raore affi- 

 nity to Nod. calcar than to our form. 



The individuals represented by Ficht. & Moll. are more »cidtratedn than our 

 form, which is narrowkeeled. 



It is a fine, highly developed form from the coralline-gravel. A more oblong 

 and smaller form occurs in the chalkooiie. 



Fig. 51 edge-view of the aperture. 



Syn. Nautilus cassis Ficht. and Moll., 1803, Test. mioroscop. p. 95, t. 17, tigg. a. — 1; t. 18, 



figg. a — o. 

 Cristell. conseeta, navicularis, nitida, Rob. marginata d'Orb., 1S26, Tabl. Meth.; Ann. So. Nat. 7, 



p. 290, 291, 288 Nn-is 1, 2, 5, 6. 

 (Naut.) Cristell. Galea Ficht. and Moll,, 1. cit. p. 100, t. 18, figg. d— f; t>'Orb., 1. cit. p. 291, 



N:o 6. 

 Cristell. erinaeea Kareer, 1878, Foram. Luzon; Bolet. Corais. Mapa geol. del Espana, 7. 2 



p. 19, t. F, fig. 3. 



Nodosarina calcar Lm. 



Tab. III, tigg. 52—61. 



This species rivals Nod. legumen in the abundance of names, which might be 

 shared suitably by three or four varieties at the most. 

 The differences consist generally: 



1) in the presence or absence of knobs and strise (verrucosa et lineata), 



2) in somewhat marked and raised septal bands (limbnta), 



3) in strongly curved septa (vorticalis). 



The varieties called ^^cidtrata^^ and >^aculeata'>^ are more or less accidental forms; 

 those appendages or outgrowths of the shell are of too fickle a character to justify a 

 particular nomination. The number of the chambers in the last whorl varies from 

 6—15. 



Thanks to d'Orbigny's efforts to split up Nod. calcar into two genera, the list of 

 synonyms has been wantonly encumbered. 



Nod. calcar becomes highly developed both on the chalkbottom and on the coral- 

 line-gravel, and it yields not in size to specimens from the chalk and tertiary formation. 



K. Sv. Vet.-Akad. Handl. Bd. 19. N:o 4. ' 



