1.36 Mr. R. Chirney on the Copepod 



joint carries two large spines reaching forward nearly to the 

 mouth. 



The mouth-parts are overhung by a large anterior lip with 

 a tootheil edge. I have not been able to detect tiie presence 

 of a bilobed posterior lip as shown by Prof. Sars in C. lavis, 

 but there is a delicate Hap or epistome bounding the mouth 

 anteriorly and fringed with short cilia. 



The first four pairs of legs are of approximately the same 

 structure in both sexes, consisting of an external branch of 

 three joints and an inner two-jointed branch as long as the 

 first two joints of the outer branch. The first pair (PI. YI. 

 fig. 4) is the shortest, and the succeeding pairs increase 

 somewhat in length, the fourth being considerably longer 

 than the first pair. The external branches of all legs are 

 alike, except that the third and fourth pair bear an additional 

 seta on the apical joint. The internal branch of the first 

 pair is alike in both sexes. The first joint bears a long seta 

 with a blunt point fringed with cilia, which, in its normal 

 position, is directed forward, reaching nearly to the month. 

 The distal joint bears a spine and a long seta. In the female 

 the iutrrnal branches of the remaining swimming-legs are 

 alike, but differ from the first pair in having the long sensory 

 seta upon the base of the second joint and in having two 

 apical setae (PI. VI. figs. 5, 6). In the male the apical 

 set£e are as in the female, but, in place of the long basal 

 seta ot the second joint, the second and third legs have a 

 })eculiar sharply-pointed spine with a small barl) (PI. VI. 

 fig. 9). The basal seta of the fourth leg is similar to tliat 

 of the female, but longer and vej-y much stouter (PI. V]. 

 fig. 10). 



The fifth pair of legs in both sexes are minute knobs 

 bearing two short spines in the female and four in the male 

 (PI. VI. figs. 7, 8). 



I have not seen any female bearing egg-sacs, but on one 

 occasion a female which had been kept alive for a few days 

 was found to be carrying a single egg attached to the genital 

 segment by a slender stalk. The egg was soon burst and 

 flattened by the movements of the animal under the cover- 

 glass. 



Lenf/th. Female "56 to '65 mm.; male "G mm. 



1 owe the discovery of this species to ]\li\ D. J. Scour- 

 field, who suggested to me that the submerged parts of dead 

 Scirjjus and Typha miglit harbour jieculiar I^utomostraca. 

 The first s])ccimen nu't with was found on July 14, IDID, in 

 a small piece of dead Typha floating in Hickling iiroad, and 

 by scjueezing such decayed stems, 1 have found that it is not 



