NO. 3586 CYCLOPOID COPEPODS — HUMES AND HO 5 



2-segmented. The new species differs from ^Y. dispar, which is hirger 

 (both sexes about 1.4 mm in length), has slender spines on the first two 

 segments of the exopods in legs 1-4, has shorter processes on the region 

 dorsal to the fifth legs, and has a terminal seta on the endopod of leg 3. 

 It seems to be close to A'', comata, with its fifth legs and three processes 

 dorsal to them being similar to those in that species. X. diminuta 

 differs from A", comata, however, in the following features: the firsi 

 segment of the exopods of legs 1-4 has a well-developed outer spine 

 (this spine minute in A", comaia), the second segment of the exopods of 

 legs 1-4 has an outer spine (lacking in A", comata), the endopod of leg 



3 lacks terminal elements (two setae in A", comata) , the endopod of leg 



4 has two terminal setae (only one in A. comata), the terminal spine 

 and seta of the second antenna are very unequal in length (nearly equal 

 in A. comata), the egg sac usually contains five eggs (sometimes six or 

 seven) (in A", comata usually twx^, sometimes one, three, or fom-), and 

 the maxilliped of the male has a form different from that of A", comata. 



Family Lichoniolgidae Kossmann, 1877 



Genus LicJiomolgits Thorell, 1860 

 Lichornolgus rhadinus, new species 



Figures 25-51 



Type material. — 199 99, 227 c^ cf , and 9 copepodids washed from 

 the coral Psammocora contigua (Esper) in a depth of 2 m, south of Am- 

 bariobe, near Nosy Be, Madagascar. Collected Sept. 8, 1963. Holo- 

 type female, allotype, and 160 paratypes (88 99, 72 cf cf ) deposited in 

 the United States National Museum, Washmgton; 85 paratypes (35 99, 

 50 d^ cf) in the Aluseum of Comparative Zoology, Cambridge, and in 

 the Zoologisch Museum, Amstei-dam; and the remaining paratypes in 

 the collection of A. G. Humes. 



Other specimens (all from Psammocora contigua in 1-2 m at Ainbar- 

 iobe, collected during 1963).— 33 99, 18 d^cf, Sept. 6; S3 99, 39 cf cf, 

 Sept. 8; 9 99, Sept. 17; and 3 99, 1 d", Oct. 6. 



Female. — Body (fig. 25) moderately slender. Length (not includ- 

 ing setae on caudal rami) 1.00 mm (0.95-1.04 mm) and greatest 

 width 0.35 mm (0.33-0.36 mm), based on 10 specimens. Ratio of 

 length to width of prosome 1.70:1. Segment of leg 1 separated from 

 head by a dorsal furrow. Epimeral areas of metasomal segments 

 formed as illustrated in figure. 



Segment of leg 5 (fig. 26) 47m x lOSju- Between this segment and 

 genital segment a short ventral intersegmental sclerite. Genital seg- 

 ment about as long as wide, llO/x x 108^, rather abruptly constricted 

 in its posterior fourth. Areas of attachment of egg sacs situated 

 dorsally (only slightly laterally), each area (fig. 27) bearing two small 



