364 MR. G. S. BRADY ON NEW OR IMPERFECTLY 



1. Bairdia bosquetiana, n. sp. (PI. LVII. fig. 5, a-e.) 



Carapace reniform, much compressed. The dorsal margin is arched, highest a Uttle 

 in front of the centre ; ventral margin gently sinuated. Extremities rounded, the pos- 

 terior sHghtly narrowed. Surface smooth, white, with opaque patches, sparingly beset 

 with small papillae. Lucid spots four, rather large and crowded together. Dorsal out- 

 line compressed, oblong-oval, with pointed extremities. 



Length ^ in. (-635 mm.). 



Hab. Atlantic Ocean, 470 fathoms {Commander Dayman's soundings). 



In its lateral aspect this species is strikingly similar to Cytheridea papillosa. The 

 lucid spots are, however, differently arranged, and the structure of the hinge-joint 

 distinctly shows it to belong to the genus Bairdia. 



2. Bairdia amygdaloides, n. sp. (PI. LVII. fig. 6, a-c). 



Carapace broadly ovate, convex, tapering to a point posteriorly, rounded in front. 

 Dorsal margin boldly arched, ventral slightly convex. Seen from below, the outline of 

 the carapace is oval, rather narrowed posteriorly. Surface smooth. 



Length ^ in. ('ZS mm.). 



Hab. Australia, 17 fathoms {Prof. Jukes' s soundings). 



I do not feel quite certain that this may not be a variety or the young of B. fusca 

 or B. ovata. 



3. Bairdia ovata, Bosquet. (PI. LVII. fig. 7, a-c.) 



Cytheridea ovata, Bosquet, Crustacea Fossiles du Limbourg (1853), p. 63, pi. 5. fig. 6, a-d. 



Carapace ovate. Dorsal margin boldly arched ; ventral nearly straight, with a slight 

 median sinuation. Anterior extremity broad, well rounded ; posterior narrow, rounded. 

 Dorsal aspect ovate. Surface white, smooth or slightly hairy. 



Length -^ in. (1 mm.). 



Hab. Abrolhos Bank. 



4. Bairdia fusca, n. sp. (PI. LVII. fig. 9, a-d.) 



Carapace subtriangular, about once and a half as long as broad. Extremities rounded ; 

 the posterior scarcely, or not at all, beaked. The dorsal margin is boldly arched, and 

 very high in the middle ; the ventral is slightly sinuated. Seen from below, the cara- 

 pace is oval, with pointed extremities. Right valve overlapped by the left, as in B. sub- 

 deltoidea. The surface of the valves is finely punctate, and covered, more especially on 

 the posterior half, with long brown setae. Colour brown. Lucid spots well marked 

 (when the valves are denuded), forming a rosette of one central and six encircling 

 spots. 



Length ^ in. (-84 mm.). 



Hab. Australia. 



