360 Messrs. Brady and Robertson on Dredging 



combined ; these two joints subequal to each other, and shorter 

 than the carpus, which is equal to the propodos ; these last 

 two joints slender and round ; no dactylos, its place supplied 

 by a fasciculus of little spines projecting directly forwards ; 

 with the exception of this terminal fasciculus of spines, the 

 whole limb is entirely glabrous. Second gnathopods not large, 

 subchelate ; carpus and propodos subequal, flattened, posterior 

 margin gently arched and furnished with tufts of spines, palm 

 not defined ; dactylos in the form of a slender, sharp, only 

 slightly curved nail, rather more than half the length of the 

 propodos. Pereiopods subequal, short ; basos not expanded ; 

 propodos longer than carpus, and bent at a right angle to it, 

 with three or four small spines on the front margin ; nail 

 small, acute, not a third of the length of the propodos, and 

 bent at a right angle to it, the whole limb thus taking a 

 strikingly hamate character. Segments of the pleon with the 

 infero-posteal margins well rounded. All the uropods two- 

 branched, their branches one-jointed, flattened, lanceolate, 

 wholly devoid of spines or hairs ; but under a high power of 

 the microscope, the edges are seen to be serrulate. Telson 

 small, squamiform, simple, entire. Maxillipedes having the 

 palp long, slender, and four-jointed, the third joint having the 

 inner margin clothed with thick down. Length scarcely one- 

 fifth of an inch. 



Found by Messrs. G. S. Brady and D. Robertson in a sponge 

 in Birterbuy Bay in 1868. The structure of the last joints of 

 the pereiopods seems peculiarly to fit those limbs for grasping 

 tenaciously the tissues of the sponge in which the animal 

 lives. Atylus gibbosus, which also inhabits sponges, has the 

 pereiopods developed on a somewhat similar plan, the propodos 

 being shorter than the carpus, and the nail bent at right angles 

 to it ; but in this species the carpus is furnished with a tuft 

 of strong spines, which seem to assist in the act of prehen- 

 sion. 



I know of no Amphipod, except the members of the family 

 Hyperiadge, that has the flagella of both antennas in a con- 

 dition so rudimentary as those of Exunguia. 



Corophium crassicorne, Bruzelius = C. Bonelln, B. & W., the 

 female. Both sexes, Ardbear Bay, 4 fathoms. The form 

 described by B. & W. as C. Bonellii is unquestionably the 

 female of this present species, as I have stated in my 

 ' Shetland Report ;' but it is worth calling attention to the 

 fact that here, again, the two sexes occur in company. 



Caprella acanthifera, Leach. Both sexes in Ardbear Bay, 

 4 fathoms. 



