510 MR. E. 3. MIEES ON CllUSTACEA 



body ; tlieir bases are concealed by a narrow process of the epi- 

 stoma : five joints of the peduncle are visible ; of these, the first and 

 second are very short, the third rather longer, the fourth as long 

 as the three preceding, the fifth as long as the fourth. The first 

 three pairs of legs are short and prehensile ; the coxae of the second 

 and third pairs oblong, rounded at their posterolateral angles, and 

 marked with two oblique impressed lines ; the femora not dilated ; 

 the succeeding joints short, naked ; the dactyli strong, arcuate, 

 and acute. The fourth to seventh pairs of legs are slender and 

 gressorial ; the coxae are acute at the postero-lateral angles, those 

 of the fifth to seventh pair greatly produced backward ; the femora 

 are slender, elongate, not dilated, but slightly keeled on their pos- 

 terior margins ; the succeeding joints slender, with a few stiff 

 hairs at their distal extremities and along their anterior margins. 

 The foliated appendages of the first five postabdominal segments 

 are not ciliated on the margins ; the rami of the appendages of the 

 sixth segment are broad and semitransparent, truncated at the 

 distal extremities, obscurely serrated and ciliated on the posterior 

 and exterior margins, and do not quite reach to the end of the 

 terminal segment ; the inner triangular ; the outer irregularly 

 quadrilateral, with the inner margin straight and parallel to the 

 distal half of the outer margin. Colour yellowish white, with 

 minute brownish-pink spots, which are visible only upon the head 

 and first two segments of the body. Length 1 inch 7g lines. 



Of this species an adult female, from which the above descrip- 

 tion is taken, a smaller individual (length 1 inch 2 lines), and four 

 young, the smallest scarcely exceeding 7 lines, are in the collection. 

 The length of the antennae and form of the terminal segment and 

 of the serrated uropoda suffice to distinguish this species from its 

 congeners. 



Nearly all the specimens of Euplectella in the Collection of the 

 British Museum contain Crustacea which appear to belong to one 

 or other of the species above described, but cannot be determined 

 with certainty without extraction from the sponges — an operation 

 which could not be effected without injury to the specimens. 



In another fine species of Sponge from Zebu (the Meyerina 

 claviformis, described by the late Dr. J. E. Gray from spe- 

 cimens brought home by Dr. A. B. Meyer) are several speci- 

 mens of an Isopod Crustacean quite distinct from the foregoing 

 species. An example of this Sponge having been divided longi- 

 tudinally for the purpose of showing its interior structure, I have 

 been enabled to examine and identify these Isopoda with a species 



