858 



fractibus ad suturam moniliferis, tumidis, antice spiraliter bicosta- 

 tis ; apertura subexpansft ; labio externo laqueato; canali brevi. 

 Nonnunquam occurrit varietas distorta, anfractibus medio plains, 

 ad suturam inflatis. 



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 part 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. 

 Had. Society Islands, II. Cuming. 



36. Cerithium echinatum (pi. clxxviii. f. 44), Lamk. Anim. 

 s. vert. Cerith. no. 11. G. mutatum, Sowerby, Gen. of Shells. 



Cerith. testa ventricosa, crassa, albida, lineis et punctis spadiceis 

 aspersa, spiraliter sulcata; anfractibus aiigulatis, adangulum tuber- 

 culis aculeatis adscendentibus magnis armatis, superne subexca- 

 vatis, ultimo magno, seriebus quinque papillis magnis obtusis 

 armato ; latere antico subcomplanato ; labio externo laqueato, 

 postice profundi sinuato. 



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

 having large upturned spines united with the other characters. 

 It differs from C. Adansoni 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, 



//. c. 



37. Cerithium Adansoni (pi. clxxviii. f. 45), Brug. E. Met. 

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



Cerith. testa ventricosa, striis crassis et papillis acutis muricata; 

 anfractibus convexiusculis, in medio angulatis, albo-lutescentibus, 

 maculis et punctis piceis aspersis ; apertura ovata, obliqua, alba ; 

 canali profundo. 



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

 part and armed with spines or papillse. Hab. Island of Annaa, 

 H. Cuming ; Senegal, H. Adanson. 



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



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

 pliciferis, spiraliter costatis, ultimo subtrigono, inferne bicarinato, 

 carinis tuberculis munitis ; apertura subtrigona. 



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



