some new and peculiar Mollusca. 433 



May be distinguished from any of the foregoing species by 

 its peculiar sculpture. It resembles in shape a very young 

 Tapes pullastra. 



Genus Glomus*, Jeffreys. 



Shell nearly spherical : cartilage internal, elongated : teeth 

 minute and set obliquely. 



Has the aspect of Pectiinculus and the hinge of Leda ; but 

 the cartilage is different, and the teeth are not arranged as in 

 either of these genera. 



Glomus nitens'f, Jeffr. 



Shell globular (except at the back, where the contour is 

 interrupted by the beak and shoulders), tliin, scmitransparent, 

 and glossy : sculpture^ numerous and regular concentric striee, 

 which disappear towards the beaks ; and with a microscope 

 may sometimes be detected very fine longitudinal strise : colour 

 white, under a pale yellowish-brown epidermis : margins 

 rounded : beaks small, rather prominent, and calyciform : 

 hmule indistinct : ligament wanting : cartilage narrow, lance- 

 shaped with the j)oint inwards, dark horn-colour, placed along 

 the hinge-line within the posterior side : hinge-line short, 

 obtuse-angled : hinge-plate strong, broader on the anterior 

 than on the other side : teeth oblique, 4 or 5 on the anterior 

 side and twice as many on the posterior side ; the former are 

 short and strong, the latter longer and more delicate : inside 

 polished and somewhat iridescent : scars triangular, but in- 

 distinct. L. 0-1125. B. 0-1125. 



Station 9, 1750 fms. ' Porcupine ' Exp., 1869, off the 

 north-western coast of Ireland, 1180-1476 fms. ; North Sea, 

 557 fms. 



Limopsis tenella\j Jeffr. 



Shell obliquely oval, compressed, rather thin, although 

 scarcely scmitransparent, somewhat glossy : sculpture^ irre- 

 gular concentric lines of growth, and a few slight longitudinal 

 strige on the posterior side : colour white : epidermis pale yel- 

 lowish-brown, arranged in numerous but not crowded rows, 

 which radiate from the beaks : margins sloping, rounded on 

 the anterior side and in front, and nearly straight on the poste- 

 rior side : heaJcs small, prominent, and incurved : cartilage 

 minute, dark horn-colour, contained in a triangular pit under- 



* A baU of thread. 



t Shining. \ Delicate. 



