10 SYSTEMATIC ARRANGEMENT 



Tribe I. Edriophthalma, Gray. 

 Eyes sessile or nearly so, on the outer side of the base of the tentacles. 



A. Hamiglossa, Gray. Teeth in three series 1 * 1 ■ 1, the central 

 broad, fixed ; lateral, versatile. Mantle and shell siphonal. 

 Operculum annular. Shell spiral, pillarless, smooth, or only 

 slightly grooved in front. 



a. Hamiglossa vera. The lateral teeth hamate, curved. Shell 

 external (figs. 1 & 6-9). 



* Foot moderate, contractile into the shell, not cross-grooved in front, 

 and not producing a polished coat on the shell. 



Fam. I. CASSIDULIDiE, Gray. 



Head elongate, conical, produced. Tentacles very small, near the" 

 end of the head. Siphon of mantle and canal of shell elongate, 

 straight. Foot simple in front. Shell spiral ; pillar smooth. 

 Operculum horny, annular, sometimes deficient. 



a. Operculum horny, ovate, acute. 

 1. Cassidultjs. 



Shell pear-shaped ; spire short ; mouth ovate, elongate, large, nar- 

 rowed in front into a broad, straight, open canal ; outer lip simple ; 

 inner lip smooth. Operculum ovate, acute, rather small. 



1. C. Melongena, t. 88. f. 1. Kg. 6.— Teeth of Cassidulus Morio. 



2. C. galeodes, t. 266. f. 1. 



3. C. Cochlidium,t.266.f. 2. 



4. C. Vespertilio. 



5. C. Colosseus. 



6. C. Morio, teeth (fig. 6). 



Head of Cassidulus nodosus 

 rostriform, conical, annulated, 

 with two very small tentacles close together at the base of the tip, 

 with the eyes on their external base. Proboscis small, conical, per- 

 fectly retractile. Lingual membrane very narrow, elongate. Teeth 

 1 • 1 ■ 1 ; central elongate, narrow, with one small central and one very 

 long, conical, lateral denticle ; lateral teeth with a knee, base simple. 

 Operculum ovate, acute, nucleus apical, acute. 



The head of Cassidulus Vespertilio conical, produced. Tentacles 

 very small, nearly close together at the end of the head. Eyes 

 small on the outer side and rather below their base. Proboscis ex- 

 ceedingly long, completely retractile, cylindrical, rigid, ringed. Teeth 

 1 • 1 ■ 1 ; central elongate, rather narrow, with three denticles in 

 front, the central smallest ; lateral hamate, with a strong basal tooth. 



Cassidulus Melongena is found on the mud-banks of Jamaica, and 

 C. patulus on those of Panama ; they are eaten in both localities. 

 — Adams. 



