224 



RADULA OF THE TAENIOGLOSSA 



in Ovnla, Pedicularia, and the Cyclostomatidar. Here the outer- 

 most of the two marginals is by far the larger and broader, and 

 is strongly pectinated on its upper edge ; in the Cyclostomatidae 



Fir:. 127.— Two rows of tlie 

 radula of Cyxiraea tiyris L. 

 x30. 



the pectinations are rather superficial ; in Ovida (where both 

 marginals are pectinated) they are decidedly deeper ; in Pedicu- 

 laria they are deeper still, and make long slits in the tooth, 

 tending to subdivide it altogether. In Tumtella the number of 

 marginals is said to vary from none (in T. acicida) to* three (T. 

 triplicata), but the fact wants confirmation. Solarium is an 

 aberrant form, possessing simply a number of. long uncini, which 

 recall those of Conus or Pleurotoma, and is therefore hard to 

 classify ; the allied Torinia has a radula which appears allied 

 to Ovula or Pedicularia. In Triforis the teeth are identical 

 throughout, very small, about 27 in a row, tricuspid on a square 

 base, cusps short. 



The normal formula of the Taenioglossa is 2.1.1.1.2; in 

 Lamellaria, 1.1.1 ; in Triforis, 13.1.13, or thereabouts. 



{d) Pteiioglossa. — This 

 section consists of two 

 families only, which cer- 

 tainly appear remarkably 

 dissimilar in general habits 

 and appearance, viz., the 

 lanthinidae and Scalarii- 



^ "2Z^^^-^^^ -^-^^^--^^ ^^^' "'"^■^ ^^^ probability 



...^--^,— ^ ,<r:_*---::j k—^.---'^ their approximation is 



only provisional. The 

 radula, which in lanthina 

 is very large, and in 

 Scalaria very small, possesses an indefinite number of long hooked 



Fig. 128. — Portion of the raclnla of lanthina 

 communis Lam. x 40. 



