106 PYRULA. 



30. canaliculata, f. 43, Gmelin. — Testa elongato-pyri- 

 formis, retiuscula, fulvo-grisea, spiraliter tenuiter sulcata, 

 spira subproducta, anfractibus 7 scalariformibus superne an- 

 gulatis, ad suturam profunde canaliculars inter angulum et 

 suturara planatis, ad angulum tuberculis moniliformibus 

 carinatis ; canali elongato rectiusculo. — Thicker in substance 

 and straighter in form than the preceding, without patches 

 of colour, and having the angle keeled, as it were, with 

 a series of bead-like tubercles. The sutural canal is deep. 



31. aruana, f. 34, 35, 36, Linnceus. — Testa late pyri- 

 formis, crassa, sensim caudata, spiraliter leviter striata, 

 griseo-fulva, fusco grisescente, biseriatim inaculis magnis, 

 rubro marginatis picta, superne angulata, ad angulum nodoso- 

 spinosa, supra angulum declivibus, apertura plerumque aureo- 

 flavida, intus kevi. — This species is not, like P. perversa, 

 sinistral, but there are other differences to be noticed, with- 

 out which that fact would hardly constitute a reason for 

 distinguishing the two shells specifically. The whorls are 

 much more sloped from the suture, the surface is smoother, 

 and the mouth is generally coloured with golden tints and 

 has no internal ribs ; specimens of a very large size exist in 

 the British Museum. The small specimen, f. 34, dextral, 

 shows rather more of the characters of the sinistral species, 

 having slight indications of ribs in the mouth. This might 

 possibly be a dextral P. perversa. 



32. perversa, f. 32, 33, Linnceus. — Testa sinistralis late 

 pyriformis crassa, sensim caudata, spiraliter lirata, griseo- 

 fulva, fusco grisescente biseriatim maculis magnis rubro 

 marginatis picta ; superne angulata, ad angulum nodoso- 

 spinosa, supra angulum depresso-planatis apertura intus 

 lirata. — The well-known Pyrula is sometimes deformed by 

 an abnormal development of the vaulted spine, as in the case 

 of fig. 33. In that form it is the P. candelabrum, of 

 Lamarck. 



33. coarctata, f. 40, Sowerby. — Testa clavato-turbinata, 

 pallide fulva, spiraliter lirata, griseo fulva, st r igis rubes- 

 centibus medio subinterruptis picta ; spira depressa, ad 

 angulum regulariter nodulosa, ultimo anfractu subito in 

 canalem rectum contracto ; apertura intus lirato. — Very 

 closely resembling P. perversa in all characters but the 

 direction of the spiral and the sudden contraction of the 

 body whorl into a long straight canal. 



