439 



MONOGRAPH OF THE GENUS 

 CANCELLATMA. 



Gen. Char. Molluscum traclielipodum marinum. Testa spiralis, 

 solida, pleriunque cancellata, spira brevi, apertura magna, colu- 

 mella spiraliter plicata. Operculum nullum. 



A marine mollusc belonging to the order of Trachelipoda, 

 having a solid, generally cancellated shell with a short spire, large 

 aperture and spirally plicated aperture. No operculum. 



1. Cancellakia cassidiformis (pi. xcii. f. 15.), Sowerly, 

 Pro. Zool. Soc. 1832. p. 53. 



C. testa crassa, sub-turbinata, spira brevi, apice acuminate, 

 sutura canaliculata ; anfractibus angulatis, ad angulum acute tu- 

 berculatis, spiraliter sulcatis; apertura oblonga antice vix emargi- 

 nata, labio interne expanso; columella triplicata; colore fusco, 

 albo unifasciato. 



Tliick, tui'binated, with a short, sharp spire, the whorls of 

 wliich are angulated, with sharp tubercles at the angle and a 

 groove at the suture. The aperture is long, with the inner lip 

 spread and the outer lip with slightly raised ridges inside. Prom 

 Panama. 



2. Cancellaria Spengleriana (PI. xciii. f. 29.), Beslmyes, 

 Enc. MeU. p. 185. C. Tritonis, Sowerhj, Conch. lUustr. f. 15. 



C. testa sub-ovali, alternatim spii'ahter decussata; spira acu- 

 minata, anfractibus angulatis, costatis ; costis distantibus, crassis, 

 ad angulum acute tuberculatis ; apertura ovali, leevi; columella 

 expansa, obtuse triplicata, granulata; labio externo denticulato 

 postice sub-canalifero, antice paululum emarginato. Colore 

 paUide fulvo, obscure bifasciato, ad angulum fusco. 



This shell is from Cagayan, Isle of Mindanao. It is decussated 

 by spiral Unes crossing thick, distant ribs ; the whorls are strongly 

 angulated near the suture, and the ribs sharply tuberculated at 

 the angle ; the folds on the columella, which is granulated, are 



