386 



MR. G. S. BRADY'S MONOGRAPH OF 



except that each valve bears near the front a slightly projecting lamina, which articu- 

 lates with that of the opposite side (fig. 30). Terminal claw of the first foot considerably 

 longer than the united length of the three preceding joints ; pectinated spine of the 

 second foot much longer than the rest, and fiexuous. Outer claw of the postabdominal 

 ramus longer and stronger than the inner. Eye indistinct. The second pair of jaws, in 

 the male, very strong, subchelate, unequal ; the larger terminal claw of the right side 

 very broad and triangular ; that of the left side elongated, slender, and much curved. 

 The terminal joint of each jaw bears also a smaller, obtuse and moveable claw, in oppo- 

 sition to the larger one ; this smaller claw is, on the left side, armed with two unequal 

 setae, the longer springing from the base at the inner side, the shorter from near the 

 middle of the outer margin. The copulative organs are of irregular shape, having 

 two slender hooked processes, and two more-robust segments, which are also hooked 

 at the extremity. 



Length in., height -gij in. 



Hab. Chiefly on a soft muddy bottom in depths of 2-60 fathoms. Shetland^, Hebrides [Mr. Jeffreys*) ; 

 Skye, Lamlash, Tobermoiy {Rev. A. M. Norman) ; Cumbrae, Peterhead {Mr. D. Robertson) ; Aber- 

 deenshire coast (ilfr. Dawson) ; Plymouth, 5 and 60 fath. {Mr. C. Spence Bate) ; Stranraer, in oyster- 

 ooze; Galway Bay, Birterbuy Bay, Channel Islands, and Northumberland coast {G. S.B.). 



This is, as the foregoing list of localities sufficiently shows, a very widely distributed 

 species, having been found at all extremities of the British seas, and also in Norway, 

 where, however, it seems to be rare. The peculiar colour, texture, and shape of the 

 shell at once distinguish it from all other species. P. acupunctata is, indeed, very 

 similar in colour, but differs decidedly in shape, and is, besides, an excessively rare 

 species. 



The specific name mytiloides, under which this species was originally described by 

 Mr. Norman, was afterwards withdrawn, on account of the name having been pre- 

 occupied by Reuss. But as the animal can no longer be referred to the genus Cy- 

 there, I have thought it right to restore the original name on the ground of priority. 



2. PoNTOCYPBis ACUPUNCTATA, Brady. (Plate XXV. figs. 53-56.) 

 Pontocypris acupunctata, Brady, Brit. Assoc. Report, 1866, p. 209. 



Lateral view oblong, subreniform, or bean-shaped, highest in the middle ; height equal 

 to half the length. Anterior extremity rounded, posterior obtusely pointed. Dorsal 

 margin arched, sloping more steeply behind than in front ; ventral deeply sinuated at 

 the anterior third. Outline, as seen from above, compressed, oval, widest about the 

 middle ; width equal to one-third of the length ; pointed in front, rounded behind. End 

 view oval. The surface of the shell, under a low power of the microscope, appears to be 

 very finely punctate ; but a higher power shows that each mark is really an exceedingly 

 short hair. Colour purplish brown. Animal unknown. 



Length ^ in., height in. ^ v-^, ^^^^ ^ 

 Hab. The Minch, 45-60 fath. {Mr. Jeffreys) ; in shell-sand, Roundstone {Br. Alcock). 



* The authority of several collectors might often be given for the same locality ; but, for the sake of brevity, I 

 have, in most cases, inserted one name only. 



