40 ZOOLOGICAL COLLECTIONS MADE DURING [Jan. 4, 



Sax I CAVA, sp. 



Hah. Station 7. 



There are two apparently young specimens of a species of this 

 genus. They may possibly belong to S. antarctica, Philippi, who 

 says(*Archiv fiir Naturgeschichte,' 1845, p. .52) that it is almost 

 impossible to separate the young of the common Greenland species 

 {S. arc tied) from the young of the Patagonian form. As far as 

 the character of the shell can determine the species, I confess that 

 the two little specimens from the Straits of Magellan appear to be 

 merely the immature state of the northern shell. 



Pandora (Kennerlia) braziliensis, Gould. (Plate V. figs. 

 4-4 c.) 



Pandora braziliensis, Gould, Sowerby, Conch. Icon. pi. 2. f 15. 



Shell somewhat ovate, truncate on the hinge side. Lower or left 

 valve diee\>, convex, thickish, whitish, with a shallow depression from 

 the umbo to the anterior part of the ventral margin, parting off about 

 one sixth of the valve into a sort of wing, which has a less length 

 than rest of the valve ; and consequently the ventral margin is in- 

 terrupted and does not form a regular curve. Down the posterior 

 dorsal slope are three slight keels, situated close together and not 

 far from the edge. Sculpture consisting of coarsish concentric lines 

 of growth ; and radiating from the umbo towards the ventral margin 

 a few rather indistinct very slightly elevated ridges may be observed. 

 Interior whitish, pearly, iridescent. Scars small, subcircular, marked 

 with a few transverse concentric layers of growth. Anterior 

 thickening of the hinge-line stout, dentiform, adjoining the front 

 scar, posterior also rather strong and projecting, forming an oblique 

 boundary to the cartilage. The latter is supported or strengthened 

 by a narrow delicate ossicle. Upper, right, or fiat valve sculptured 

 with fine concentric lines of growth and also with arcuate brown radia- 

 ting striae. The anterior part is also parted off, as in the lower valve, 

 by an indistinct depression from the apex to the front part of the 

 ventral margin. Posterior dorsal slope nearly at right angles to the 

 rest of the surface of the valve, forming an acute angle. Interior 

 exhibiting about the central portion a few radiating shallow punc- 

 tured striae. Scars similar to those of the other valve. Teeth two, 

 one very strong, the other thin, narrow, diverging, forming a base for 

 the cartilage. Pearl beautifully iridescent. Width 21^ millims., 

 length 16, thickness 6. 



Hah. Station 2. 



This species is considerably like P. wardiana, A. Adams, from 

 Mantchuria ; but when closely compared together there appear 

 several differences by which they can be distinguished. The form 

 is not precisely similar ; the position of the scars is different ; and the 

 dentition is much stronger in the present species, although a smaller 

 shell. As far as I can ascertain, Gould has not published this name ; 

 but the valve figured in Sowerby's characteristically slovenly mono- 

 graph is labelled in the Cumingian collection P, hraziliensis, 



