858 



fractibus ud suturam monilifcris, tiimidis^ antice spiraliter bicosta- 

 iis; apcrtura subexpaiisA, ; labio cxtcrno laqucato; canali brcvi. 

 Noiimuiquam occurrit varietas distorta^ nnfractibus medio ])lani?, 

 ad suturam iiiflatis. 



This species is remarkable for its tendency to exaggerate the 

 natural prominence of the whorls at the suture into a sort of 

 swelled chord, leaving the greatest ]jart of several whorls plain. 

 In the specimen figured from Mr. Hanley's collection the mon- 

 strosity has occurred and continued for several whorls, and then 

 the shell has commenced a return to its characteristic sculpture. 

 Hah. Society Islands, //. Cuming. 



86. Certthtui\i eciiinatum (pi. clxxviii. f. 44), Lamlc. Anim. 

 s. vert. CerifJt. no. 11. C. mutatnin, Smnerb/j, Gen, of Shells. 



Ccrith. testa ventricosa, crassa, albidu, lineis ct punctis spadiceis 

 aspcrsa, spiraliter sulcata; anfractibus angulatis, ad angulum tuber- 

 culis aculeatis adscendentibus maguis arraatis, superne subexca- 

 vatis, ultimo magno, seriebus quinque paj)illis magnis obtusis 

 armato ; latere antico subcomplanato ; labio externo laqueato, 

 postice profunde sinuato. 



Tliis is the only species answering to Lamarck's description as 

 having large upturned spines united with the other characters. 

 It ditfers from C. Adavsoni in the upturned spines, in the depres- 

 sion of the upper part of the whorls, and in the comparative 

 smoothness of the surface. Island of Annaa, Society Islands, 



//. a 



37. Cerithium Auansoni (pi. clxxviii. f. 45), Brng. E. Met. 

 t. 1, p. 479; Kien. Mon. Cerith. pi. iv. f. 2. 



Cerith. testa ventricosa, striis crassis ct papillis acutis muricatfi; 

 anfractibus convexiusculis, in medio angulatis, albo-lutesccntibus, 

 niaculis et punctis piceis aspersis ; aperturfi ovata, obliqua, alba ; 

 canali profundo. 



A very ventricose shell, with the whorls divided in the upper 

 part and armed with spines or papilla3. Ilab. Island of Annaa, 

 H. Cibming ; Senegal, //. Adanson. 



38. Cerithium munitum (pi. clxxx. f. 93), NoUs. 



Cerith. testa conica, turrita, alba ; anfractibus subangulatis, 

 pliciferis, spiraliter costatis, ultimo subtrigono, inferne bicarinato, 

 carinis tuberculis munitis ; apertura subtrigona. 



Resembling C. halteatmn, but of a conical form, with two large 



