420 DESCRIPTION OF {Tolygastrica. 



PiNNiJLARiA Termes. — Striated, small, narrow, oblong, rather con- 

 stricted at the ceuti'e, and towards each end ; the ends obtuse, widely- 

 rounded, and produced. 



P. Utriculus. — Striated, oblong dorsally, sides straight, slightly 

 curving towards the ends, which are tapering but obtuse. Approacjhes 

 P. (lisplwnia. Mexico. 



P. caraccana.—k. variety of P. horealis, larger and more dilated at 

 the middle. Length 1 -480th. 



P. oceanica. — Elliptic- oblong ; its length twice its breadth, ends 

 subacute ; umbilicus small, round, clearly defined ; suture double, 

 margin very delicately but widely pinnate ; pinnules twenty in 

 1-1 200th. Length 1-5 70th. Southern Ocean. 



P. lamfrocampa Very large, sigmoid, slender, lanceolate ; very 



delicate striae on margin; apices subacute. Length l-144th. 

 Pinnules are visible in the dry state, but not in the living. It is 

 very mobile. Baltic and Falaise. 



P. lihyca. — Striated, small ; dorsally navicular, ovate-lanceolate, 

 acute ; laterally quadrangular and truncate ; pinnules fourteen in 

 1-1 200th. Habit of Kavicula fulva, but is wider and not rostrate. 

 Length l-5a0th. Oasis, Sinai. 



V. Kefvingensis. — Striated, small, _ lanceolate, and navicular dor- 

 sally ; pinnules converging towards the centre, and seventeen in 

 1 -1200th. Length 1 -430th. ; very close to P. viridula, but more 

 slender. 



P. (?) thermalis. — Small linear ; cuneate and acute dorsally ; laterally 

 truncate. Length l-576th. In warm springs. Habit of Fragihria 

 acuta; umbilicus unknown. 



P. Furcida. — Small, dorsally elliptic ; oblong on both sides, 

 linear ; apices constricted, umbonate (bossed) ; pinnules converging 

 to the centre. Length l-864th. to l-720th. Lossil. 



P. Gemina. — Small, divided by a constriction, existing on each 

 aspect, into two lenticular segments ; remarkable by a central spine ; 

 (a/piculus) when seen on the side. Length l-840th. to 1 -648th. 



P. Semimdum. — Found by Ehrenberg in the plastic marl of 

 ^gina. 



P. coardata. — The same habitat. 



