332 MALACOZOA. GASTEROPODA. SCUTIBRANCHIAT1. 



ultimately bifurcate. It is said to occur in the Mediterra- 

 nean. 



Emarginula curvirostris. Deshayes, Lamk. Svst. vii. 586. 

 Emarginula conica. Blainv. Malac. PL 48. f. 4. 



FAMILY II. CALTPTR^INA. 



Animal conical, not spiral, or only in a slight degree; 

 head broad, depressed; tentacula large, pointed; eyes 

 on small prominences at their outer base ; foot thin, 

 nearly circular ; branchial cavity very large, opening 

 widely before, and containing filamentary branchiae. 

 Shell subconical, not symmetrical, sometimes with the 

 apex spiral. Name from the genus Calyptreea. 



GENUS 1. CAPULUS. 



Animal conical, slightly spiral at the summit ; with 

 the head distinct, the mouth proboscidiform ; the tenta- 

 cula thick, subcylindrical; the eyes on small prominences 

 at their base externally ; the foot large and thin ; the 

 branchial cavity open anteriorly, and furnished with 

 numerous narrow and longitudinal laminse, adhering by 

 a single transverse line to its floor. 



Shell irregular, conical, with the apex more or less 

 inclined or spiral, and placed behind ; the aperture 

 roundish, with the margin simple, and continuous ; the 

 cavity deep, with a muscular impression in the form of 

 a horse-shoe. 



Name from the cap-like form of the shell. Montfort. 



1 . Capulus Hung&ricus. FooVs-cap Capulus. 



Shell conoidal, rather thin, longitudinally sulcato- 

 striate, concentrically rugose, and covered with a pilose 

 epidermis ; the apex recurved, involute, much nearer the 

 posterior end ; the aperture roundish-oval, thin-edged, 

 sinuous. Named from its resemblance to a Hungarian 

 cap. 



A small individual, five-twelfths of an inch in diameter, was 

 found in January, 1843, by one of my pupils, Mr. William 

 Robertson. It is slightly decayed, with the epidermis abraded, 

 the colour dull white externally, yellowish-white within. When 



