MAEINE COPEPODA OF NEW ZEALAND. 35 



Male. — Cephalothorax and abdomen as in the female except that the abdomen is 

 five-jointed ; none of the caudal setae have dilated bases (fig. 23). Eighteenth joint 

 of the right antennule (fig. 21) very faintly serrulated. Fifth foot (fig. 22) of the 

 right side strongly prehensile, basal joint large, subquadrate, and produced into a long 

 curved claw which opposes the three-jointed outer ramus; first joint of the outer 

 ramus about twice as long as broad, second and third not much longer than broad and 

 bearing respectively one and two short marginal spines ; fifth foot of the left side short, 

 simple, three-jointed, last joint forming a short curved unguis. 



Hob. Taken plentifully in the surface-net in the Bay of Islands and Otago Harbour, 

 also at a depth of 6 fathoms in Auckland Harbour. 



Of all the specimens examined not one was found in perfect condition, and all were 

 very brittle and opaque owing to the action of picric acid preservative. The species is 

 very closely allied to the well-known T. longicornis of European seas, but there is no 

 serration of the right male antennule, except on the eighteenth joint ; the widely- 

 dilated tail-seta of the female is characteristic, and the serratures of the spines of the 

 swimming-feet are much fewer and larger than in T. longicornis. 



Genus Centropages Kroyer. 

 1. Centropages discaudatus, sp. nov. (Plate X. figs. 1-7.) 



? Centropages typicus Kroyer, var. aucklandicus Kramer (i), pi. xv. figs. 1-5, p. 217. 



Female. — Antennules very slender, 24-jointed, reaching considerably beyond the 

 posterior end of the cephalothorax. Infero-posteal angle of the cephalothorax produced 

 on each side into a long spine. Abdomen (fig. 6) three-jointed; first joint dilated 

 proximally and bearing on its dorsal margin a slender plumose seta ; second joint 

 longer, much dilated proximally ; third very short, constricted proximally; furcal joints 

 short, not much longer than broad, almost square as seen from above (fig. 7), distally 

 truncated and bearing five rather short terminal setae, three of which are bulbously 

 dilated at the base. Outer branch of the fifth pair of feet (fig. 5) having its second 

 joint produced inwardly into a very stout and long spine. 



Male. — Infero-posteal angles of the cephalothorax spinous, but not so strongly as in 

 the female; abdomen four-jointed, all the joints subcylindrical (fig. 1), furcal joints 

 cylindrical, about twice as long as broad, terminal setae not swollen at the base ; the 

 first abdominal segment short, the following three nearly equal, not very much longer 

 /than broad and altogether devoid of spines. Basal joints of the antennules (fig. 1) 

 almost devoid of marginal processes or teeth; joints from the 13th to the 18th much 

 swollen, the 15th and 16th each bearing a strong marginal spine; the three following 

 joints densely pectinated with fine seta? (figs. 2, 3), which, at the base of the 17th joint, 

 are replaced by a series of small squared tubercles. Outer branch of the fifth pair of 

 feet of the right side (fig. 4) terminating in a chelate joint, the blades of which are 



