92 



SHELL GALLERY. 



The genera Boltenia and Culeolus include species in which the 

 body is attached to a peduncle. 



The large exhibited specimen of Boltenia pachydermatina is 28 

 inches in length, the head being 4 and the stalk 24 inches long. 

 The two four-lobed apertures are along one edge, the branchial 

 being the lower ; the body is marked with long deep furrows, and 

 the stalk with transverse wrinkles. Culeolus perlucidus, from 1600 

 fathoms in the Southern Ocean, is in the form of a small pear- 

 shaped head on a slender stalk, the total length being 4| inches. 

 The branchial orifice forms a transverse slit with raised lips near the 

 stalk, the slit-like atrial orifice being near the rounded end of the 

 body. Gideoliis moseleyi, another slender-stalked form, was obtained 

 from 2425 fathoms in the Central Pacific. 



The little Cyntbiid Styelopsis grossidaria (Fig. 11), popularly 

 known as the " Currant Squirter," occurs in the form of bright red 

 hemispherical blobs on stones and shells ; when undisturbed, the 



Fig. IL 



A. Styelopsis grossularia on shell. B. Tadpoles of same, x 9. 

 a, branchial; b, atrial orifice. (B, after Sir J. Dalyell.) 



branchial and atrial orifices expand and project upwards. The eggs 

 are brilliant red in colour. Sir John Dalyell was the first to discover 

 the tadpole form, which is about yV i^ich long (Fig. 11, B), and to 



