380 MR. G. S. BRADY ON NEW OR IMPERFECTLY 
conspicuous tubercles along the ventral margin, in place of the simple ridge which 
characterizes the present species. C. arachnoidea bears also small tubercles at the 
points of intersection of the surface network, and another row of them just within the 
finely serrated anterior border. 
T have inscribed this species to my friend the Rev. A. M. Norman, whose numerous 
contributions to carcinology and other branches of science are widely known, and to 
whom I am indebted for much valuable help in the study of natural history. 
20. Cyruere scaBra, Von Miinster. (Pl. LXI. fig. 8, a—d.) 
Cythere scabra, Von Miinster (1830), Jahrbuch fiir Mineralogie, p. 63. Bosquet, Entom. Fossil. 
des Terr. Tertiair. de la France, p. 105, pl. 5. fig. 7. (?) Egger, Ostrak. der Miocin-schicht, 
p. 26, t. 4. f. 10. 
Carapace oval, broadest in front. Extremities well rounded. Dorsal and ventral 
margins slightly arched. Dorsal outline ovate. Surface thickly covered with spines, 
which vary considerably in size, and give a rough, bristling appearance to the whole 
shell. 
Length (Atlantic) s';in.(1mm.), (Abrolhos) 3/5 in. (‘78 mm.), (Crete) 45 in. (°57 mm.). 
Hab. Atlantic, 2050 fathoms (Com. Dayman); Abrolhos; Crete (mud) 360 fathoms 
(Capt. Spratt). 
21. CyTHERE PARKERI, n. sp. (Pl. LXII. fig. 1, a—e.) 
Quadrilateral, convex, once and a half as long as broad. All the margins gently 
arched, and terminating in obtuse angles. Dorsal aspect broadly oval ; margins slightly 
serrated: a stout, blunt tooth or tubercle on each valve in the position of the anterior 
hinge. The lateral separated from the ventral surface by a rounded keel or angle. End 
view subpyramidal ; angles rounded ; lower border flat. Surface pitted. 
Length qs in. (571 mm.). 
Hab. Australia. Several specimens. 
I have pleasure in inscribing this species to W. K. Parker, Esq., to whom I am 
indebted for the opportunity of describing many of the species noticed in this paper. 
22. CyruEre compacta, n. sp. (PI. LXII. fig. 3, a—d.) 
Carapace subtriangular, scarcely once and a half as long as broad. Anterior extre- 
mity broad, obliquely rounded; posterior narrow, angular. Ventral margin convex ; 
dorsal margin highest at anterior third, arched, somewhat angular. Dorsal outline 
oval, with truncate extremities. The ventral ridge is most conspicuous behind, where 
it crosses the shell transversely in an irregular line, and is continued along the dorsal 
margin. End view subquadrilateral. Surface marked by strong reticulations enclosing 
large quadrangular pits. 
Length 3g in. (508 mm.). 
Hab. Turk’s Island (shallow water). 
