NO. 3573 COPEPODS — ^HUMES AND HO 7 



8:1) and the body is larger (1.63 mm) and more slender. In L. 

 rigidus Ummerkutty (1962) the formula for the last segment of the 

 exopod of leg 4 is 111,1,5 and the body is larger (1.25 mm). In L. 

 rotundus Sewell (1949) the free segment of leg 5 is short, swollen, and 

 somewhat produced on the outer margin, with a ratio of about 2:1. 

 In L. tenuicornis Brady (1910) the caudal ramus is about 7:1, the free 

 segment of leg 5 has a small basal expansion, and the body is larger 

 (1.7 mm). In L. vagans Gurney (1927) (based on the male), the body 

 is larger (1.07 mm) and the last segment of the second antenna 

 (Gurney, 1927, p. 466, fig. C) has a ratio of length of the outer margin 

 to width of about 5.6:1, thus being slightly more slender than in L. 

 organicus, where the ratio is about 4.5:1. 



Since we still do not know the taxonomic importance of the vari- 

 ation in many characters observed in Lichomolgus (such as the termi- 

 nal armature of the second antenna, the armature of the exopod of leg 

 4, the exact form of the mandible and leg 5, etc.), we find it impossible 

 in Lichomolgus to say mth which species L. organicus is most closely 

 related. Such a conjecture would seem to be premature in view of the 

 apparent very incomplete knowledge of the species in this genus. 



Lichomolgus conjunctus, new species 



Figures 31-36 



Type material. — ^163 99 and 25 cTcf from a colony of Tuhipora 

 musica (Linnaeus), in 1 m, Pte. Ambarionaomby, Nosy Komba, near 

 Nosy Be, Madagascar, collected June 8, 1964: holotype 9 (USNM 113391) , 

 allotype (USNM 113392), and 89 para types (USNM 113393) (79 99 

 and 10 cfcf ) deposited in the United States National Museum, 45 

 paratypes (40 99 and 5 cfcf ) in the Museum of Comparative Zoology, 

 Harvard University, and the remaining paratypes in the collection 

 of A. G. Hiunes. 



Other specimens. — 'All from Tubipora musica collected in 1964: 

 121 99 and 53 cf cT, in 1 m, Pte. a la Fievre, Nosy Be, Jan. 5; 9 99, in 

 15 cm, Tany Kely, a small island south of Nosy Be, Mar. 29; 8 99, in 

 1 m, Pte. Ambarionaomby, Nosy Komba, Mar. 31; 14 99 and 3 d^cf, 

 in 1 m, Pte. a la Fievre, Apr. 15; and 43 99, in 2 m, Pte. Ambari- 

 onaomby, Sept. 27. 



In the description that follows, morphological features not specifi- 

 cally mentioned may be assumed to be essentially like those in L. 

 organicus. 



Female. — Body (fig. 31) Avith prosome more pointed anteriorly 

 than in L. organicus. Length of body (without ramal setae) 0.80 mm 

 (0.72-0.87 mm) and greatest width 0.38 mm (0.34-0.40 mm), based on 

 10 specimens. Ratio of length to width of prosome 1.53:1. 



