HO. 1139. DEi-:r-n:iTi-:if MOLLUSCA\'I<:HI:ILL AXI> arsrr. 847 



The northern specimens (/,. profit ml icola) formerly referred doubt- 

 fully to this species prove to be distinct. The single specimen now 

 iiicluded agrees \vell with a specimen of the fossil form from Europe. 



LIMOPSIS PROFUNDICOLA, new species. 



Plates LXXY, lig. 4; LXXXIII, lig. 4.) 

 l.ini(>i>.iix (inritd, variety (?) VERRILL, Trans. Conn. Acad., VI, p. 440, 1885. 



Comparatively few specimens, at ten stations, between N. lat. 41 7', 

 W. long. <r> 2(>' 30", and X. lat. 30 47', W. long. 73 3 9' 30", in 1,525 to 

 1,859 fathoms, 1884-1886. 



Family MYTILIDJB. 



CRENELLA FRAGILIS Verrill. 

 ( Plate LXXXIII, figs. 1, 2.) 



CreiK-llii fragiiis VERRILL, Trans. Conn. Acad., VI, p. 444, 18S5. I )ALL, Bulk U. S. 

 Nat. Mas., No. 37, p. 40, 1889. 



One valve and a fragment, station 2205, N. lat. :!7 7' 40", W. long. 

 74 35' 40", in 70 fathoms, 1884. 



GLOMID.K, new family. 



lihnnuni VF.RKILL and Busn, Amer. .louru. .Set., Ill, pp. 53, 5H, January, 1S!I7. 



Shell short, roundish at both ends. Hinge-plate with a row of trans- 

 verse teeth each side of the middle. Ligament thick, elongated, 

 attached for most of its length to the inner surface of the posterior 

 hinge-plate and running forward in a narrow groove beneath the 

 beaks, so that its anterior portion is external and its thickened pos- 

 terior portion is partly internal. No pallial sinus. Animal not known. 



This group includes, so far as known, only the genus Glomus Jef- 

 freys, which has been referred by several writers to the Arcida\ and by 

 others to the Ledidae, from both of which it differs widely. Its rela- 

 tions to the ISTnculida- are somewhat uncertain, owing to our ignorance 

 of the soft parts. In the form and position of the ligament it differs 

 entirety from all other genera of Nu.culid.ji? and Ledida 1 . 



A more mature consideration of this group, since the publication of 

 our former article, leads us to consider it as a family distinct from 

 Nuculidse. 



GLOMUS Jeffreys. 



(.rlomus J KFFKEY.J, Annals Mag. Xat. Hist., p. 433, November, 187C>. VERRILL aiid 

 I.rsn, Amer. Join n. Sri., Ill, pp.53, 59, January, 1897. 



Type. Glomus nifaix Jeffreys. 



Shell thin, smooth, snbequilateral, rounded at both ends, with the 

 beaks turned forward. No lunule or escutcheon. Hinge with two 

 series of obliquely transverse teeth ; a small lateral tooth may be present. 



