94 GOES, RimCULAKIAN KIll/OL'UDA OF Tllli CARIBBEAN SKA. 



Carpenteria balaniformis GKAY var. proteifonnis n. 



Tab. VI, figg. 208214; Tab. VH, ligg. 215219. 



In general our form agrees in structure with Carpentaria balaniformis from the 

 Pacific (Carpenter Introduction t. 21); but it appears to be of a higher development 

 than the latter. It is a Proteus without its equal in this class. Its original structure 

 is regularly rotaline, but owing to its strong propensity to propagate additional cham- 

 bers, particularly from its upper, i. e. apertural side and from the chamber-walls also 

 issuing strong tubes, out of which new chambers are developed, the greatest variety of 

 forms and alienation from the parent-type is the result. At one time the shell has 

 its balaniforrn shape carrying on its top a cluster of ovoid or globular chambers. At 

 another time this cluster appears detached from its parent shell, of which nothing is 

 traceable. Sometimes the whole assumes the shape of a somewhat irregular jNodosarina. 



When this becomes ramified, the whole resembles some forms of Polytrema, to 

 which genus Mr. CARTER not improperly has referred this species (CARTER, 0n the Poly- 

 tremata, A- M. N. H. (4) 17. 187G. p. 185). This variety is often of a rosecolonred 

 tinge; its chambers are generally of smaller size and more closely fitted and irregu- 

 larly triserially arranged, the whole structure somewhat resembling a Ceriopora cribrosa 

 GOLDF., but not so regularly built as that. Its surface is often provided with coarse 

 scattered impressions beside the channelpores. 



Again it is developed in a free and unattached state into the shape of a large 

 Globigerina or Bulimina. The chambers are sometimes of an extraordinary size 

 3 or 4 mm. The pore-canals are large, pretty regularly and closely arranged in the 

 thick walls. 



Carpenteria Rhaphidodendron MOEB., 1880, Maurit. u. Seychell. p. 81, t. 5, figg. 

 6 10, t. 6, figg. 1 6 seems not essentially to differ from the Philippine form. 



Rupertia stabilis WALLICH, A. M. N. H. (4) 19 (1877) p. 501, t. 20 seems to be- 

 long to this genus, and may be a pigmy form ot this species notwithstanding its fissure- 

 like and differently placed aperture. Its near affinity to Carperiteria is also indicated 

 by Mr. WALLICH. 



Sphceroidina dehiscens PARK, and JONES, from India (Philos. Trans. 155. 1. t. 19, 

 fig. 5, seems also to come nearer to Carpenteria than to any other genus. 



It is not rare in the coralline-gravel and also in the chalk-ooze; it grows not 

 seldom to a hight of 10 mm. with long varicous branches. 



Fig. 208 is the regular balaniform-rotaline, attached form ; a new chamber shoot- 

 ing forth from the apertural part. 



Fig. 209: a thin section of the walls, showing a network of pores very densely 

 arranged. 



Fig. 210: a tranverse section at the base, showing an entirely rotaline structure. 



Fig. 211: another form with aulostorna-tubes on the latest segment. 



Fig. 212; Nodosarina- or Virgulinaformed. 



