62 



teriorly, so as to appear when viewed from above as if crowded 

 into each other, and the very delicate wrinkling of their superior 

 portion renders the diagnosis clear. 



Cerithium celatum, Couthouy MS. Testa subulato-turrita, 

 dilute rufa : spira anfr. ad 13 vix convexis, longitudinaliter crebre 

 sulcatis, et lineis duabus impressis cinctis, ultimo anfr. ad basim 

 inornato; sutura impressa : apertura rotundata ; columella arcu- 

 ata, rostro brevissimo. Long, f ; lat. \ poll. Hab. Terra del 

 Fuego. 



This species belongs to the same group as C. turritella, which 

 it resembles ; but in its delicate form it still more strongly resem- 

 bles C. sardoum, Cantr. 



Cerithium filosum. Testa parva, elongato-turrita : spira 

 anfr. ad 8 planulatis, sulcis et liris alternantibus requalibus ad 

 4 cinctis, coloribus cinereis et pallide rufis partitis ; sutura 

 impressa : apertura parva, semi-elliptica, antice emarginata ; col- 

 umella vix arcuata ; labro acuto. Long, f , lat. -£ poll. Hab. 

 Puget Sound. 



Only a single specimen of this turritella-like Cerithium has 

 been examined. It is of the same type as C. ccelatum, and is 

 well characterized by its simple revolving lines and grooves, and 

 its coloration. 



Cerithium pusillum. Testa minuta, fulva, turrita, varicosa, 

 longitudinaliter undata, undis ad 10, prope basim evanescentibus : 

 spira acuminata, anfr. 8 convexis, fills tenuibus granulosis 4 cinc- 

 tis, anfractu ultimo multicincto : apertura lata, ovata, obliqua ; 

 rostro brevissimo ; labro varicoso ; columella arcuata. Long. {•, 

 lat. T V poll. Hab. Sandwich Islands. 



A little shell about the size, and with many of the characters 

 of C. Emersonii. It also resembles C. ferrugineum, Say, but is 

 much smaller. 



Cerithium egenum. Testa minuta, lanceolata, albida, ad 

 basim maculis parvis fuscis notata : spira acuminata, anfr. ad 10 

 convexiusculis, filis ad 5 cinctis, quorum centrali et suturali ma- 

 joribus, anfractu ultimo utrinque varicoso : apertura rotund ato- 

 ovalis ; rostro brevissimo ; columella postice callosa. Long, f, 

 lat. £ poll. Hab. Wilson's Island. 



