722 DEEP WATER MOLLVSKS AND BRACHIOPODS—DALL. vol.xvu. 



recurved sliort beak, rather large foramen incomplete below to the 

 extent of about one-fourth its circumference, with a small obsolete 

 deltidial plate on each side ; teeth strong, short, supported each by a 

 strong buttress with a recess behind it, and in old specimens with a 

 smooth deposit of callus on the surface of the valve between the two 

 buttresses; no median septum, the muscular impressions faint, situated 

 in the upper fourth of the valve; brachial valve flatter, orbicular, with 

 a small very low cardinal process produced downward, three times its 

 width, on the surface of the beak between the crural plates, as a low 

 ridge rounded above; crural plates strong, supported by buttresses 

 for half their length, rather close together, supporting a tliin delicate 

 brachidium, longitudinally grooved near and at the recurvation, with 

 a few spinuleson the outer edge, thehaimal border of the bight of the 

 loop showing a small projection opposite the crural process of each 

 side, the brachidium reaching three-fourtlis of the distance froui the 

 cardinal border to the basal margin and over all one-third as wide as 

 the valve; pallial sinuses following much the same course as in M. venosa 

 but straighter, less branched, and of a whitish instead of reddish 

 brown color. Height of shell, 22; width, 10; diameter, 9.5 mm. 



Station 2783, in 122 fathoms mud, bottom temperature 48oF., off the 

 west coast of Patagonia, in latitude 51^2' south; and station 3360, in 

 1672 fathoms, sand, temperature 42oF., in the Gulf of Panama. IsTos. 

 87547 and 122859, U.S.N.M. 



When first examined one of these specimens was erroneously sup- 

 posed to be the young of Terebratula fontaineana, Orbigny, a species 

 which should doubtless be referred to 3fagellania venosa, Solander, as a 

 synonym. Later and more careful study of a second specimen has 

 enabled me to correct my mistake. From the young of M. venosa the 

 incomplete foramen enables it to be discriminated, without examining 

 the interior of the shell. In a general way this species looks very much 

 like an adolescent specimen of Laquens jeffreysii, in general outline, but 

 is flatter. 



MACANDREVIA CEANIELLA. new species. 

 Plate XXX, fig. 1. 



Shell much resembling in size and form the specimen figured by 

 Davidson,* below referred to, but rather more rectangular with a less 

 prominent beak, and a narrower and more slender brachidium. Surface 

 of shell smooth, except for numerous strong concentric lines of growth 

 and prominent punctation. Under a lens a microscopic radial sculp- 

 ture is visible on parts of the shell, resembling the fibrous surface of a 

 worn EhynchonellaT&theY than regular striation. Form of shell rounded, 

 rectangular, with a low beak and large foramen; pedicle valve rather 

 inflated, the side and basal margins slightly excavated, the basal cor- 

 ners rounded but slightly prominent, from which the obscure rectan- 



*See Macandrevia sp., Davidsok, Mou. Rec. Brach., I, pi. xii, fig. 13, 1889. 



