NO. 1312. SYNOPSIS OF THE VENERID.F^DALL. 403 



lainellation is soinowhut more prominont, as iisuiilly tlic case in this 

 ^roup; there are also some tine coneentric wrinkles; luiuile small, 

 lanceolate, nearly smooth, impressed; ligament defended on each side 

 by a narrow raised rib; there is no radial sculpture; interior pure 

 white; pallial sinus long, linguiform, upper boundary of it nearly 

 horizontal; internal margins smooth, hinge normal, atiterior lateral 

 strong. Length, 47; height, 36; diameter. 22 nmi. 



Bay of Panama, in 14 fathoms, mud, at station 2S(>1, l)y the I'nited 

 States Fish Commission steamer Alhatros-s. Cat. No. 96388, U.S.N. M. 



CYTHEREA (VENTRICOLA) FORDI Yates. 



Plate XV, tig. 7. 



As the original tigures in tlie Bulletin of the Santa Barl)ara Society 

 of Natural History are accessible to few students, I have added a fig- 

 ure of a well-grown valve from the collection of the United States 

 National Museiim, dredged by me off the north side of Catalina Island 

 in 16 fathoms. Cat. No. 12o7(>4. U.S.N.M. 



CYTHEREA (VENTRICOLA) MAGDALENiE, new species. 

 Plate XV, tig. 6. 



Shell thin, inflated, suborbicular, inequilateral, the beaks near the 

 anterior fourth of the length; color yellowish, with radial series of pale 

 brown painting; lunule cordate, striate, fiattish, pale brown; escutcheon 

 not defined; sculpture of primary distant and secondary adjacent con- 

 centric lamella? which are pedicillate, their expanded summits coalescent 

 and microscopically radially, closely striate; interior white or yellow- 

 ish; inner margins minutely crenate; pallial sinus small, angular; hinge 

 strong, anterior lateral distinct in the young, anterior right and pos- 

 terioi^left cardinals thin, entire, the others thicker and sulcate or bifid. 

 Length, 42 (to 48); height, 38; diameter, 26 mm. 



Dredged bv the United States Fish Commission steamer A/hafross 

 off Magdalena Bay on the west shore of Lower California, at station 

 2989. in 86 fathoms. Cat. No. 109214, U.S.N.M. 



CYTHEREA (FOVEOLATA VAR?) LEPIDOGLYPTA Dall. 

 Plate XV, figs. 4, 5. 



Shell suborlucular, moderately convex, yellowish white, profusely 

 concentricallvlamellose; beaks prominent, anteriorly directed; lamelUe 

 on the beaks somewhat alternated, three or four secondary lamellfe 

 appearing between each pair of primary slightly higher ones, but over 

 the greater part of the disk they are uniform and snndar, with slight y 

 wavy edo-es and the ventral face of each lamella very finely closely 

 transverselv striated, the bottom of the channels between the ribs 



