REPORT ON THE LAMELLIBRANCHIATA. 325 



Glomus japonicus, n. sp. 



Testa parva, tenuis, rotiuulato-ovata, subsequilateralis, parum nitida, epitlermide 

 tenui flavescente, coucentrice teuuiter striata, iuduta. Margo dorsi anticus prirao 

 leviter arcuatus, dein oblique suljrecte declivis, ventralis late regulariterque arcuatus. 

 Umbones parvi, paulo prominentes, albi, fere mediani; Ligamentum cardinale obliquum, 

 parvum, postice inclinatum. Dentes circiter- septem ante umbones conici, acuti, pos- 

 teriores ad tredecem magis obliqui, minores. Pagina interna nitida, pallida cseruleo-albida. 



This species is longer than high, roundish ovate, rather more pointed in front than 

 behind. It is moderately convex, very thiu and fragile, the slightest inequilateral, the 

 anterior end being a trifle longer than the posterior. It is clothed 

 with a thin pale yellowish epidermis, is glossy only at the umbones, 

 and marked with very fine incremental stria3. The beaks are small, 

 white, the least raised above the dorsal line, and situated the slightest 

 behind the centre. The front dorsal maroin is shortly curved at ^, 

 first, then descends obliquely in a straightish line to the anterior 

 extremity. The posterior margin descends rather more obliquely from the beaks in a 

 gentle curve. The hinge-plate is feeble and bears about seven conical teeth in front of 

 the centre and twelve or fourteen rather smaller and more oblique ones on the hinder 

 side. The ligament is small, and inclines obliquely towards the posterior side from the 

 tip of umljones. The interior is glossy, and of a pale bluish tint. 



Length 5 mm., height 4|, diameter 2\. 



Habitat. — Station 237, off the south-east of Nipon, Japan, in 1875 fathoms. 



Until the discovery of this species, the genus Glomus has only been known as 

 an Atlantic type. This is quite distinct from all the other .species,- being larger and 

 different in form and dentition. 



Limopsis cristata, Jeffreys, var. 



Limopsis cristata, Jeffreys, Ann. and Mag. Ifat. Hist., 1876, vol. xviii. p. 4.34. 

 Limopsis cristata, Jeffreys, Proc. Zool. Soo. Lond., 1879, p. 58.5, pi. xlvi. fig, 8. 



Habitat.— ^t-Aiion 5, February 21, 1873; lat. 24° 20' N., long. 24° 28' W. ; south- 

 west of the Canary Islands ; depth, 2740 fathoms ; bottom, 

 red clay. 



iw^m I 



The single perfect specimen and a few odd dead valves 

 from the above locality do not correspond exactly with the umojms cnsiata, iim^^. - ,-r/w, 

 typical examples oi this species with which 1 have com- 

 pared them. They are rather less oblique in growth, have the anterior side, or that 



