54 



httrodiiction fo Animal Morphology, 



5th. Peneroplidge, shells striated, brown, sometimes perforate, 

 with single, lobulate, or branched openings ; shells helicoid, 

 ear-shaped, or discoidal, ex. Dendritina. 



Order 2nd. Perforata or Foraminifera ^xo'^^x {U Orhigny), 

 shells vitreous, perforated, includes the following families : — 

 I St. Lagenidae — monothalamous ; mouth circular; shell hard, 

 finely perforated, ex. Lagena. 2nd. Orbulinidae — monothala- 

 mous, with globose test. 3rd. Orthocerinidae — chambers 

 successive, in a straight (Nodosaria) or bent line (Dentalina), 

 openings circular in the centre of the septum. 4th. Poly- 

 morphinidae — cells alternating ; sides unsymmetrical, some- 

 times with a bifurcating axis, ex. Bulimina.'^' 5th. Cristel- 

 laridae — nautiloid, finely perforate ; chambers encircling each 

 other, with an opening at the upper angle, ex. Cristellaria. 

 6th. Nonioninidae — vitreous, often siliceous ; intercameral 

 opening at the lower angle, ex. Eozoon, Siderolithes, 

 Nonionina. 7th. Uvellinidx — chambers uniserial, spiral, 

 turbinate, coarsely perforate, ex. Globigerina, spinose when 

 recent, Uvellina, 8th. Ro- 

 talinidae — helicoid or tur- 

 binated, with embracing 

 chambers, ex. Rosalina, 

 Rotalia. 9th. Borelidas — 

 shell coiled on an elongated 

 axis, divided by incomplete 

 septa, ex. Borelis. loth. 

 Soritidae — discoidal, with 

 cycloidal whorls of cham- 

 bers, ex. Cyclolina. nth- 

 Conulinidae — axis straight, 

 mouth of many pores, ex. 

 Conulina. 12th. Textu- 

 laridae — axis elongated, 

 chambers symmetrical, al- 

 ternate, double roAved, 

 (Frondicularia, Textularia). 13th. Cassidulinidae — resem- 

 bling the last, but with the axis once curved perpendicular to 



Fig. 2. 



y/i 



'jmxrn^ 



Globigerina bulloidcs. 



* Made the type of a family Buliminidae, 



