AET. 18 SYXOPSIS OF CALAN"OID CRUSTACEA MARSH 49 



the exopod reaches about one-half the length of the second segment. 

 The terminal hook has a rounded dentate process on its inner border 

 at about two-thirds of its length. The left foot has two elongated 

 processes from the second segment of the basipod, one or both repre- 

 senting the endopod. The terminal segment has a stout dentate 

 spine on its outer border and terminates in three pointed processes. 



Length, 1.2 mm. 



Occurrence. — Found in India in brackish water. 



SENECELLIDAE, new family 

 Genus SENECELLA Juday, 1923 



SENECELLA CALANOIDES Juday 



Plate 24 

 Seiiecella calanoides Jttday, 1923, p. 205; 1925, pp. 1-6, pis. 1-3. 



FeTnale. — The head is indistinctly separated from the thorax; it 

 has no rostrum or rostral filaments. The last thoracic segment is 

 rounded and not expanded laterally. The abdomen (pL 24, fig. 7) 

 has four segments. The first segment exceeds in length the other 

 three. The caudal rami are short and have short hairs on both the 

 inner borders and the surface. The first antennae reach the second 

 abdominal segment. The exopod of the second antenna (pi. 24, fig. 3) 

 has seven segments. The first feet have 1-segmented endopods; the 

 second, 2-segmented; and the third and fourth, 3-segmented. The 

 endopod of the first foot has a ciliate shoulder or tuberous promi- 

 nence (pi. 24, fig. 5) at about one-half the length of its outer border. 

 The first basal segment of the fourth feet has, on its inner margin 

 (pi. 24, fig. 2), a blunt spine, which has the appearance of a broken 

 seta. The fifth feet are lacking. 



Length, 2.65 mm to 2.88 mm. 



Male. — The abdomen (pi. 24, fig. 6) is composed of four segments; 

 the furcal rami are very short and have short hairs. Juday states 

 that the male abdomen has five segments and has so figured it. An 

 examination of a number of preparations by the author has failed to 

 show the separation of the fifth segment. The caudal rami are 

 shorter than in the female. 



The right antenna is not geniculate, but is like the left. The 

 mandible, maxillae, and maxilliped are smaller than in the female. 

 The endopod of the first swimming foot is like that of the female. 

 The first basal segment of the fourth foot (pi. 24, fig. 1) in place of 

 the blunt spine found in the female has a cuplike depression in which 

 there is a minute, acute spine. 



On the right fifth foot (pi. 24, fig. 8) the endopod is slender, 

 pointed, and extends beyond the second segment of the exopod. The 



155089 — 33 i. 



