40 EEV. T. R. E. STEBBING ON A 



preceding it, an unusual relation which supports the opinion that in this 

 genus the diminished number of Joints is due to a coalescence of the sixth 

 and seventh. 



TACHiEA SPONGILLICOLA, sp. n. (Plate 6.) 



Front of head bisinuate, with small median process. First segment of 

 per£eon with anterior margin not bisinuate; this segment centrally not much 

 longer than any but the seventh. Perseon considerably longer than pleon, 

 of which the first five segments are too-ether shorter than the telsonic 

 segment. This last is as broad as long, apically very broadly rounded in 

 female, partially truncate in male ; margins serrate, four setae and eight spines. 

 Eyes small, dark, widely separated. 



First antennae having a much dilated first joint, slightly longer than broad, 

 the second (or probably true third) joint being shorter and much narrower; 

 the flagellum of seven short joints overlapping base of fifth joint in the 

 second antennae. In these the first three joints are short, the fourth a little 

 shorter but stouter than the fifth ; the flagellum sixteen-jointed, rather longer 

 than the peduncle. 



The mandibles end in a sharp tooth, with another inconspicuous one a little 

 to the rear. The broadest part of the trunk follows the insertion of the palp 

 which is very near the base, the first joint being the broadest, the third the 

 shortest but with the largest number of spines. The surface of the trunk 

 shows fish-scale markings under high magnification. 



The first maxillae have a rounded apex to the inner plate; beyond this the 

 outer plate tapers to its strong single apical tooth. The second maxillae have 

 an undivided apical plate, as broad as long, broadly rounded distally. 



The maxillipeds of the ovigerous female have the vibratory laminae of the 

 first and second joints largely developed, with strong muscles. The lamina 

 of the second joint is distally fringed with long plumose setae, and is 

 prolonged nearly to the end of the four- jointed palp. The first three joints 

 of the palp are each broader than long, only the terminal joint being rather 

 longer than broad; this, as above suggested, probably representing a union 

 of two joints. One maxilliped in our specimen has a small mite with its 

 mouth placed on the first joint of the palp and its body reaching half across 

 the anterior vibratory plate. The maxillipeds of the male by the absence of 

 the vibratory laminae have a very different appearance from those of the 

 female. The palps, however, differ only slightly. In the female the palp's 

 third joint is rather larger than the second; in the male the reverse is true; 

 in both, the terminal joint is the largest in the palp. 



The first guathopods and two succeeding pairs of limbs are closely alike, 

 with the fourth joint short and the fifth still shorter, the sixth robust, more 

 so in the female than in the male, the trunk of the finger considerably longer 

 than its well-defined unguis. The four following pairs of legs are successively 



