NO. 1139. DEEP-WATER MOLLUSCAYEERILJ, J .VI) BUSH. S39 



CYCLOPECTEN LEPTALEUS Verrill. 



(Plato LXXXV, fig. l. 



Pecten hptaltus VERKILL, Trans. Conn. Acad.. V, pp. 232, 2S1, 1882; Kxpl. .lllxi- 

 tross, Report U. S. Coin. Fish and Fisheries lor isx;j, ]t. 577, 1885. DAI. i., 

 Hull. Mus. Comp. /ool., XII, p. 221, 1886. 



1'iinHlaiiutsiinii leptaleun DALL, Bull. U. S. Nat. Mus.. No. 37, p. 34, 1889. 



Ci/<'l<>i>c<-/<'ii lejtlttli'iti VKURILL, Trans. Conn. Acad., X, pp. 85, 92, 1897. 



Mr. Ball lias expressed a doubt as to this species being distinct 

 from I'ecten iinbrifcr Loven, therefore a very much enlarged figure of 

 the shell is here introduced for comparison. 



In addition to the published description, it should be stated that the 

 concentric lines are somewhat thickened and elevated, even where 

 thinnest, and that the beaded character is quite unlike anything found 

 on C. -imbrifer, or allied species. The beads are closely arranged, 

 elliptical in form, and most elevated at the center, the elevation being 

 often greater than the diameter ; the summit is smooth and glassy, so that 

 when viewed from above, under a lens, they often appear to have a cen- 

 tral cavity. The radial lines are comparatively very thin and delicate, 

 and not visible, except when considerably magnified. The beaks are 

 more acute than in C. imbrifer, and the nucleus smaller and smoother. 



Two live specimens, station 2109, oft' Cape Hatteras, J^orth Carolina, 

 in 142 fathoms, 1883. 



CYCLOPECTEN PUSTULOSUS Verrill. 

 (Plate LXXXV. tigs. 5, (i. 10, 11.) 



Pecten pustulosns VERRILL, Amer. Jonrn. Science. V, p. 14, 1873; Trans. Conn. 



Acad., Ill, p. 50, 1871. 

 1'i'cten Itoskynsi var. pustulosus VERRILL, Trans. Conn. Acad., V, }i. 5M, pi. xui, 



ligs. 22, 22a, 1882 (not pi. XLIV, fig. 11). Not Pecten lioxki/n*i G. O. SAHS. 

 Pecten pustidosns VERRILL, Trans. Conn. Acad., VI, p. 2(!1 (p. 281 in part), 1884; 



Kxpl. Albatross, Report U. S. Com. Fish and Fisheries for 1883, p. 557 (in 



part), pi. xxxi, figs. 142a, 6, 1885. 

 Pecten imbrifer DALL, Bull. Mus. Coinp. Zool., XII, p. 220 (in part), (not pi. iv, 



figs. 4,i, 4ft), 1886; Bull. U. S. Nat. Mus., No. 37, p. 34 (in part), pi. IAIV, 



ligs. 142, I, 1889 (not pi. iv, figs. 4a, 4ft). Not Pecten inibrifer LOYKN. 

 Cyclopvcten piistiilosus VF.KRILL Trans. Conn. Acad., X, pp. 70, 83, 92, pi. xix, 



figs. 3, 4, 1897. 



This species has been referred to Propeamusium lioski/nxi by Jef- 

 freys, and to Pecten ( Cydopeeten } imbrifer by Ball. It never has the 

 internal ribs, like the former, which it resembles in sculpture. From 

 the latter, as originally described by Loveu, and redescribed and 

 figured by Or. O. Sars, it differs especially in the character of the orna- 

 mentation of the left valve. The Scandinavian form, according to 

 these authors, has the vesicles much less crowded in each radial row 

 and subconical and mucronate in form; while in ours they are usually 



