HO. 1139. DEEP-WATI'.l! MolA.I'scArEREILL A\D I'.l'SH. 779 



Family LBPTONID^} or BKYCINIDJ-:. 



KELLIA SUBORBICULARIS (Montagu). 



(Plate xciv. tigs. :;, i.) 



siiborbiciilaria II. and A. ADAMS, Genera Recent Moll., II, p. 475: III, ]>1. 

 cxiv, figs. 8 a-c, 1858. JEFFREYS, I5ritish C'onchology, II, p. 225. pi. v, lig. 

 3, 1863; V, p. 179, pi. xxxn, fig. 2, 1869. Gon.n, Rep. on Invert, of Mass.. 

 Binney's eel., p. 83, fig. 394, 1870. TRYOX, Anier. Mar. Condi., p. 171, pi.:::. 1 . 

 figs. 433, 435, 1873. G. O. SAKS, Mollusca Reg. Arctica- Norvcgi.-r. p. 67, pi. 

 19, figs. 14 a-b, 1878. JEFFREYS, Proc. Zool. Soc., London, p. 700. June, 

 1881. SMITH, E. A., Report Voy. Challenger, /oil]. Lamellibranchiata, XIII, 

 p. 201, 1885. DALL, Bull. U. S. Nat. Mns.,No. 37, p. 200. pi. I.XYIII, fig. :,, 1889. 



One fresh specimen, Massachusetts Bay, off Salem, 1877. This 

 species appears to be very rare on the American coast. In its hiuge- 

 characters it seems to agree closely with Born la Philippi, 1836. 



MONTACUTA BIDENTATA (Montagu). 

 (Plates XC1II, tigs. 7, 8; XCIV, fig. 6.) 



J///a bidenlata MONTAGU, Test. Brit., p. 41, pi. xxvi, fig. 5, 1803. 



Jlontacula bideniala FORBES and HAXLEY, Hist. Brit. Moll., II, p. 75, pi. xvm, 

 figs. ti. <>. 



J'f Hi in iid bidi-iiidtu H. and A. AI>AMS. (ionera Krc.-nl Moll., II, p. 478; III, pi. cxv, 

 tigs. 2, 2r(. l^r.s. 



Miit(ictit hidantata JEFFREYS, British ConcLology, II. p. 208, pi. v. fig. 1. 1X63; 

 V, p. 177, pi. xxxi, fig. 8, 1869. <;.<>. SAR>. Mollusca Keg. An-tica- Xorvegia-, 

 p. 69. pi. 19, figs, \la-b, 1878. JEFFREYS. Proc. Xonl. Soc., London, p. 698, 

 June, 1881. VERRILI,, Trans. Conn. Acad., V, p. 571. 1882. BUSH, Trans. 

 Conn. Acad.. VI. p. 479, 1885; Expl. Albatross, Report U. S. Com. Fish and 

 Fisheries for 1883. p. 590, 1885 Not Mont(t<-utn bidmtala Gould. 



Comparatively few specimens have been found in Long Island Sound 

 and at Thimble Island (A. E. Verrill); Provincetown, Massachusetts 

 (S. I. Smith and O. Harger); Vineyard Sound, 1875; Cape Cod Bay, 

 1870; off Block Island. 1SSO: Woods Hole, Massachusetts (Gut of 

 Canso, and Naushon Gutters), 1882-83. From low-water to 15 

 fathoms. Off Cape Hatteras, Xorth Carolina, in 14 to 48 fathoms, 1883 

 and 1S84. 



MONTACUTA BIDENTATA (Montagu), variety TENUIS, new. 



(Plate XC1I. fig. 7.) 



Shell similar to the typical M. Lidentata in form and size, but rela- 

 tively more elongated and more nearly elliptical, with the umbos and 

 beaks somewhat less prominent. The surface is covered with line and 

 pretty regular lines of growth. The teeth in the right valve are strong, 

 nearly equal in length and in the amount of divergence from the dorsal 

 margin. They diverge more strongly and are thicker and more promi- 

 nent, especially at the inner end, than is usual in the true Indent at a. 



Length of a medium size specimen 4.7 mm.; height, 2.0 mm. 



