some new and peculiar Mollusca. 433 



May be cli8tiii<^uished fruin any of the foregoing species by 

 its jK'culiar sculpture. It resembles in shape a very young 

 7aj>es j)ullaii(ra. 



Genus Glomus*, Jeffreys. 



SnKLl. nearly spherical : cflWiVcr^c internal, elongated : teeth 

 minute and set obliquely. 



lias the asj)ect of IW'tunruIus and the hinge of Lfihi ; but 

 the cartilage is diti'erent, and the teeth are not arranged as in 

 either of these genera. 



Glomus nitens'fj JeftV. 



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

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

 and glossy : sculpture, numerous and regular concentric strias, 

 which disappear towards the beaks ; and witii a microscope 

 may sometimes be detected very fine longitudinal stride : colour 

 white, under a pale yellowish-brown epidermis: margins 

 rounded : beaks small, rather prominent, and calyciform : 

 lunule indistinct: ligament wanting : cartilage narvow, hdncc- 

 shapod with the point inwards, dark horn-colour, placed along 

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

 obtuse-angled: hinge-plate sti'ong, 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. 01125. B. 0-1125. 



Station 9, 1750 fms. ' Porcupine ' Exp., 1S69, off the 

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

 557 fms. 



Limopsis tenella f , JefFr. 



Shell obliquely oval, compressed, rather thin, although 

 scarcely semitransparent, somewhat glossy : sculpture, irre- 

 gular concentric lines of growth, and a few slight longitudinal 

 striae 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 : leaks small, prominent, and incurved : cartilage 

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



• A baU of thread. 



t Shiniiiij. I Delicate. 



