1911 1 Esterly: Copepoda of the San Diego Region 327 



The outer rami of all the feet are 3-jointed and in the first 

 fool each joint has a spine on the outer margin. The outer rami 

 are not spinose on the surfaces, but in the third and fourth feel 

 the second joinl of the inner ramus has groups or rows of heavy 

 spines { pi. 6, fig. 97 I . 



Length: About 4 nun. 



Coloration: Translucent and unpigmented. 



Occurrence: Station 1134, vertical from 285 f., June 20. 1906. 



Genus Scolecithrix Brady. 



Several species of Copepoda are found in the San Diego 

 region which differ in important respects; these forms would be- 

 long to a number of different genera if one were to follow the 

 classification of Sars or of Wolfenden. Bu1 as I stated in another 

 paper (Esterly, 1006. p. 64). it does not seem to me that the 

 separation of the large genus Scolecithrix into other well-defined 

 genera is possible; at least. 1 find it difficult to do so with the 

 San Diego forms. So I shall describe these specimens under the 

 genus Scolecithrix, even if it .should be found desirable later to 

 change the classification. 



Scolecithrix vorax n. sp. 



PI. 27, tigs. 15, 21; pi. 29, fig. 45; pi. 30, fig. 68; pi. 31, figs. 93, 96, 99. 



Adult female. The head is smoothly rounded and the rostrum 

 is bifid, the prongs being stout, long and somewhat divergent ( pi. 

 27, lig. 15). The last segment of the thorax is rounded and the 

 margin is indented above and below the middle (pi. 29, tig. 45 I . 

 The cephalothorax is 5-segmented and six and one-half times as 

 long as the abdomen and furca; the abdomen is 4-segmented, the 

 genital segment being more than twice the length of the others 

 together; the second and third are of equal lengths and the anal 

 is longer than the preceding one (pi. 27, fig. 21 ; pi. 29, tig. 4.")). 



The anterior antennae are 23-jointed and, as carried on tin' 

 body, do not reach back to the first segment of the thorax. The 

 outer ramus of the posterior antenna is one and one-half times 

 as Long as the inner ramus ami the bristles are very long and 

 richly plumose. The anterior maxilliped has eight of the append- 

 ages so characteristic of the genus; but some of them are of a type 



