GENERA AND SPECIES. 



133 



Philine. (PHILINIDJE.) Plate xxx. 



Patterned with dots or links 



569. scabra, fa in. whorls 3, outer lip indented in the upper 



part, mouth angulated. 



570. catena, $ in. whorls 2 or 3, outer lip indented in the 



middle, mouth oval. 



571. angulala, ^ in. whorls 2 or 3, conspicuous and keeled, 



mouth square. 



572. quadrata, \ in. whorls 2 or 3, rounded, mouth oval, top of 



outer lip scalloped, top of outer lip higher 

 than spire, 



573. punctata, ^ in. whorls 2, rounded, mouth oval, top of outer 



lip scalloped and lower than spire. 



Cancellated 



574. pruinosa, J in. spire small, sunk below the crown. 



575. nitida, ^ in. spire smooth and conspicuous. 



576. aperta, in. spire loosely coiled and inconspicuous. 



Pholadidea. (PHOLADID&.} Plate xiv. 



164. papyracea, ijin. x fin. two dorsal shields, small and close to the 

 hinge on anterior side ; shell with transverse 

 ridges on the upper half, and smooth below. 



Pholas. (PHOLADID&.} 

 1 60. dactylus, 5 in. x ij in. 

 161. Candida, 2| in. x 



162. parva, if in. x 



163. crispata, 2j* in. x i 



Plate xiv. 



four dorsal shields. 

 i in. one dorsal shield, 



which is broadly 

 lanceolate, ribs radiating from beak. 



in. one dorsal shield, which is curved and 

 narrowly lanceolate, ribs transverse. 



in. one dorsal shield, which is small and tri- 

 angular, ribs longitudinal. 



Physa. (PHYSIDM.) Plate xvii. 



227. acuta, f in. whorls 3 to 5, mouth ending in a sharp angle. 



228. fontinalis, J in. whorls 4 to 5, spire short. 

 224. hypnorum, f in. whorls 6 to 7, spire long. 



Pinna. (AVICULIDJE.) 

 31. rudis, 15 in 



Plate iii. 



fan-shaped, surface minutely punctured 

 hinge plate folded over the ligament. 



Pisidium. (CYRJENID&.} 

 85. antnicum, f x J in. 



86. fontinalis, 



Plate vii. 



shell triangular, inequilateral, with the 

 anterior side the longer. 



in. shell triangular, striated concentrically, 

 posterior side much produced and rounded* 



