CALIGID.E. 207 



moderate size. The free segment of the metasoine is longer 

 than usual, the length equalling the breadth. The urosome 

 in the female is composed of two joints; the first (or genital) 

 segment is subquadrate and hirge, as broad as three-fourths 

 of the cephalosome, and its breadth and length subequal ; 

 the second segment is oblong, about one-third of the length 

 of the genital segments ; the uropodal rami are small. 



The antenuules are of unusual length, the second joint 

 being more than five times as long as broad, and much longer 

 than the first joint ; it bears a single spine on the posterior 

 margin. The antennae are sharply hook-formed. The first 

 maxillipeds have the second joint long, and the longer of the 

 two nails equal to half that joint in length. The second 

 maxillipeds (fig. 5) are of moderate size. The furca (fig. b') 

 encloses with its nearly straight arms an arch which is 

 narrowly rounded above. The fourth feet (fig. 8) are three- 

 jointed, the two distal joints equalling the length of the 

 basal, the second jouit bears a well-developed spine at its 

 termination ; the third joint has one lateral and the usual 

 three terminal spines, of which the middle spine is the longest. 

 Length 5' 5 millim. 



The male has the urosome (fig. 7) three-jointed, the first 

 narrow, oblong ; the combined length of the last two joints is 

 about equal to that of the first. 



The chief characteristics of this species are the length of 

 the second joint of the antennules, and the structure of the 

 fourth feet, in which the middle terminal spine being the 

 longest, is, as far as we know, a unique feature. 



Taken forty years ago on Zeus fal>cr (John Doree) at 

 Polperro, by Laughrin, and sent by him to A. M. N. 



SCLENOPHILUS TENTHS, P. J. van Beneden. 



1852. Scitenophilus tennis, P. J. van Beneden, Bull. Acad. .Roy. 

 de Belgique, vol. xix. p. 404, and plate. 



Four specimens taken by Bassett-Smith at Plymouth on 

 the inside of the operculum of Sciccna umbra. 



PSEUDOCALIGUS BREVII'ES (BaSSett-Smith). 



1890. Cnlit/ns lircripciJis, Bassett-Smith, p. 11, pi. iii. fig. 1. 



1901. Pseudncnfii/HS brevipedis. A. Scott, "Some additions to the 



Fauna of Liverpool B;iv," Trans. Liverpool Biol. Soc. vol. xv. 



p. 350, pi. ii. figs. 1-0. 



Plymouth, from the gill-cavity of Mot ell a tricirrata 

 (Bassett-Smitli\ 



