KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 19. N:0 4. 15 



Nodosarina radicula LIN. var. monile SOLD. 



Tab, I, tig. 37. 



The shape of the chambers varies from globular and ovoid to cylindrical, some- 

 times produced and extenuated nearly to the same diameter as the necks. In such 

 cases the limits of them and the chambers become nearly effaced and the shell be- 

 comes cane-shaped with slight impressions at the joints. 



By some intermediate varieties, on which many names have been bestowed by 

 different authors as Nod. limbata D'()RB., Nod. </randis Rss., Nod. insecta SCHW., 

 Nod. subnodosa Rss., Nod. globifera Rss., Nod. punctata, glabra, rugosa D'ORB. etc., all 

 provided with more or less globular, short-necked, tightly joined chambers N. mo- 

 nile passes over in its type N. radicula. 



On the other hand the straw- or cane-shaped varieties as N. ionffiscata, ovicula 

 D'OHB., N. Ewaldi, trichostoma Rss., N. arundinacea SCHWAG., N. Czizechiana NEUGEB. 

 link N. monile very closely to the slender forms of Nod. communis D'ORB. that 

 is to say: Dental. Boueana, consobrina, Lorneiana D'ORB. which are scarcely distin- 

 guishable from these forms of N. monile. 



Nod. inflexa Rss., N. guttifera D'ORB. and some others with globular chambers and 

 somewhat constricted joints are also such intermediate forms between N. monile and 

 N. communis. 



The length of the visible necks between the chambers is of no specific value; 

 for in the same shell we often meet with the chambers of the first stage closely con- 

 nected, but those which come last are often separated by long necks. The shape of 

 the neck and its being inclosed more or less by a subsequent chamber occasion the 

 the greatest inconstancy in the shape of this variety. 



Such specimens as are covered with spines, prickles or short bristles, should not 

 be distinguished by particular names - - as has been done by some authors. The pro- 

 duction of these appendages is probably quite occasional, and in most cases they are 

 broken off remains of pseudopodial tubes, their generation and preservation having been 

 promoted by the locality and the mode of life of the animals. A pelagic life seems 

 to be favourable to the growth of such a development of shell-substance. 



Fig. 3 represents a variety near to Dent, soluta Rss. 



Fig. 4 is the same as Nod. inverses, NEUGEB. 



Fig. 5 is Nod. stipitata Rss. or N. semirugosa D'ORB. 



Fig. 6 belongs to the same variety, coming very near to the straw-shaped Nod. 

 monile. 



Fig. 7 represents an aulostoma form. The chambers are compressed, vial-shaped, 

 somewhat triangular in the vertical section and set alternately, the broad diameter of 

 one chamber being placed at right angle to the same diameter of the next. 



Like other aulostoma-rnonstrosities not uncommon in Nodosarinte and Poly- 

 rnorphinse and sometimes also in Planorbulinae and Globigerina? (in Carpenteria it is 

 nearly the rule) its chambers in their upper part are provided with a few short, 



