60 THE VOYAGE OF H.M.S. CHALLENGEE. 



few (four or five) short broad teeth ; the posterior armed beloiv the middle with six or eight 

 nearly similar teeth ; dorsal margin very slightly arched ; ventral straight, except that 

 near the front at its junction with the anterior border it is produced downwards into a 

 conspicuous angular prominence ; seen from above, the outline is about thrice as long as 

 broad, compressed, with parallel sides and tapering acuminate extremities ; end view 

 ovate, compressed, width scarcely equal to half the length (in the plate, fig. 5, d, the 

 ventral margin is, by an error of the artist, placed uppermost) ; surface of the shell 

 smooth, or finely punctate. Length, l-28th of an inch ("9 mm.). 



Dredged off the Azores; lat. 38° 37' N., long. 28° 30' W., 450 fathoms, sand 

 (Station 75) ; Torres Straits, lat. 11° 35' S., long. 144° 3' E., 155 fathoms, sand (Station 

 185); and in a sounding from 160 fathoms (Station 305). 



A very distinct and well marked species, described first from specimens taken at Halt 

 Bay hi the Straits of Magellan. Only one or two specimens were found in each of the 

 dredgings mentioned above. The specific name angulosa has been already used for a so- 

 called member of this genus by Egger (Ostrac. der Miocan.-Schicht. bei Qrtenburg), but 

 as the form to which Egger applied the name is in all probability a Cytheridea — at any 

 rate not a true Bairdia — there can be no impropriety in allowing the name angulata to 

 stand. 



[PI. XL fig. 5, a-d. a Carapace seen from left side, h from above, c from below, d 

 from front. Magnified 50 diameters.] 



21. Bairdia tiiberctdata, G. S. Brady (PL X. fig. 3, a-d). 



Bairdia rliomhoidea, Brady, Les Fonds de la Mer, torn. i. p. 162, pi. xix. figs. 14, 15. 



Carapace oblong, tumid ; seen from the side, subrhomboidal ; height equal to half the 

 length, and nearly the same throughout ; extremities obliquely rounded and fringed 

 irregularly with small blunt teeth ; dorsal margin very slightly arched ; ventral straight 

 or a little sinuated ; seen from above, the outline is ovate, scarcely twice as long as broad ; 

 with rather irregular margins and rounded extremities ; end view depressed, height 

 less than the width ; shell-surface rather rough, with small closely-set tubercular pro- 

 minences. Length, l-33d of an inch {-77 mm.). 



This species was found only in a dredging from 16 to 25 fathoms, off the Admiralty 

 Islands. 



The specific name rhomhoidea being preoccupied (Kii-kby, Ann. and Mag. Nat. Hist., 

 1858), I have substituted that of tubercidata. The types from which the species was 

 first described, and which agree exactly with those found in the Challenger dredging, were 

 got at Mauritius. 



[PI. X. fig 3, a-d. a Carapace seen from left side, b from above, c from below, d 

 from front. Magnified 40 diameters.] 



i 



