NO. 3574 COPEPOD CRUSTACEANS — LEWIS 187 



Measurements. — (In mm) 1 female: 



female 



Total length, including egg naasses 3. 75 



Length of cephalo thorax, to maxillae 2. 30 



Length of cephalothorax, to maxillipeds 0. 36 



Width of anterior region of cephalothorax 0. 37 



Width of posterior region of cephalothorax, just anterior to maxillae 0. 94 



Length from anterior to posterior end of maxillae 0. 94 



Width of base of maxillae 0. 80 



Length of trunk 2. 00 



Width of trunk 2. 33 



Description of female. — Body (figs. 70a, 6) separable into 2 parts, 

 vermiform cephalothorax and broad, posteriorly romided trmik. 

 Anterior end of cephalothorax slightly expanded, from dorsal view- 

 point; tapered to narrow, rounded end, in lateral view, ventral sm^- 

 face bearing antennules, antennae, mandibles, maxillules, and 

 maxillipeds. Margin of anterior end of cephalothorax with heavily 

 sclerotized band broken by several mmute swellings associated with 

 minute channels through band, similar to nodules bearing hau'like 

 processes on caligoids. Remaining part of cephalothorax iiTegular 

 (irregularities may be due to preservation), with several superficial, 

 incomplete annuli. Trunk expanded, rounded from dorsal and ven- 

 tral viewpoints, overlapping dorsal posterior end of cephalothorax; 

 lateral and posterior sm'faces covered by egg cases, cases projecting 

 dorsally at flat angle giving semi V-shaped appearance in trans- 

 verse section. No abdomen visible although possibly covered by egg 

 cases; caudal rami not distinct although 2 minute, knoblike projec- 

 tions present between egg cases at posterior end of trunk, projections 

 not visible imless egg cases separated. Outer covering of egg cases 

 appearing thick, with moderately sclerotized band on lateral region. 



Because of the small size of the appendages, with the exception of 

 the second maxillae and maxillipeds, the presence of only a single 

 specimen in the collection and the resultant hesitancy to dissect the 

 appendages, the following description should be used with some 

 caution. 



Antennule (fig. lOd) situated on lateral-median ventral surface of 

 cephalothorax, behind anterior end of body and slightly lateral to 

 mouth cone. Appendage 3-segmented, first segment longer than 

 combined lengths of remaining 2 segments; third segment bearing 4 

 minute, subconical projections. Antenna (fig. 70e) situated between 

 antennule and base of labrum, appearing imiramous; 2-segmented, 

 tipped by clawlike projection. Mouth cone distinct though small, 

 with distinct space between labrum and labium. Labrum appearing 

 pointed distally, with heavily sclerotized band medially; labium with 

 U-shaped opening distally. Mandible (fig. 70e) rodlike, flattened 

 distally, with approximately 6 falciform denticulations along distal 



