NO. 1139. DEEP-WATER MOLLUSC A VERBILL .i\I> BUSH. 837 



CAMPTONECTES GRCENLANDICA (Sowerby) Verrill. 



(Plate LXXXV, fig. 7.) 



Pecti'ii ijranlandicus So WERBY, Thesaurus Conchvliorum, Pt. II, p. 57, pi. xili, fig. 



40, 1842.HAM.KY, KYrrnt Shells, p. 274, 1842 to 1856. JEFFREYS, Ann. and 



Mag. Nat. History, p. 231, 1877. 

 I'ecteii uronliindicus G. O. SARS, Moll. Reg. Arct. Norvog., p. 23, pi. 2, tigs. 4, 



a-c, 1878. 

 Pecleu </ni nitindicus JEFFREYS, Proc. Zoiil. Soc. London, p. 560,1879. VERRILL, 



Chock-list, p. 26, 1879. 



Pectcn griiiiJundicuy VERRILL, Trans. Conn. Acad., V, p. 581, 1X82. 

 Pecti'ii i/r<i ii Ian dii'iis LOCARD, Campagnc du Caudan, Annales de I'Univcrsito de 



Lyon, p. 217, 1896. 

 Camptonectes grcenlandica VERRILL, Trans. Conn. Acad., X, pp. 82, 91, 1897. 



The shell is rounded, inequivalved, very thin, hyaline, nearly smooth, 

 often with a violet iridescence when fresh. The left valve is covered, 

 even from the nucleus, with flue microscopic camptonectes sculpture, iu 

 the form of thin, raised, divergent riblets, more or less irregular and 

 wavy, most visible by translucency. The left valve sometimes has, also, 

 fine radial stria- and delicate lines of growth. The margins are thin and 

 smooth, that of the right valve turns up a little against the other, which 

 is larger, and the valves close very tightly, so that anteriorly there is 

 scarcely any visible gape, even at the byssal notch or at the end of the 

 auricle. The byssal notch is well-marked and the pectinidial teeth are 

 em-all and few. The byssus is probably very slender. The auricles are 

 not oblique and are nearly equal. The hinge-plate is very thin; the 

 single longitudinal ridge is scarcely visible. 



A row of six or seven ocelli can be seen through the shell in alcoholic 

 specimens. 



A few live specimens were dredged by the United States Fish Com- 

 mission at four stations, off Newfoundland Banks, in 130 to 224 fathoms, 

 between N. lat. 47 40', W. long. 47 35' 30", and N. lat. 44 46' 30", 

 W. long. 59 55' 45", 1884-1880. It is also known from the Arctic 

 Ocean and off northern Europe. 



CYCLOPECTEN NANUS Verrill and Bush. 

 (Plate LXXXV, figs. 2-4.) 



Cyclopecten nan-m VERRILL and BUSH, in VEKUILL, Trans. Conn. Acad., X, pp. s.1. 

 92, pi. xvi, figs. 12-12c, 1897. 



Shell small, the breadth and height about equal, the valves nearly 

 equal in size and convexity. Dorsal hinge-margin rather long and 

 straight; auricles relatively large and broad, both ends in the left valve 

 subtruucated or a little convex and forming nearly a right angle with 

 the dorsal margin, and having a small incurved notch, well differen- 

 tiated from the body of the shell. In the right valve the anterior 

 auricle is narrow, somewhat more elongated, obtusely rounded at the 



