14 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



These differences are probably not to be construed as evidence 

 against the congeneric position of the two species; comparable dif- 

 ferences in mouthparts exist among the species of the genus Licho- 

 molgus. The points of similarity are so great that we think it pref- 

 erable for the present to regard M. unihastatus and M. psammocorae 

 as members of the same genus. The form of the endopod of leg 4, 

 regarded as especially diagnostic in lichomolgid copepods, supports 

 this point of view. 



The inclusion of M. psammocorae in Monomolgus will necessitate 

 a revision of the original generic diagnosis, especially in relation to 

 the mandible. We are not attempting such a revision at present, 

 however, in the expectation that further studies will clarify the 

 generic concept of Monomolgus. 



Rhynchomolgus, new genus 



Female. — Cephalosome expanded, urosome narrow. Segment of 

 leg 1 fused A\dth head. Urosome 5-segmented. Rostrmn tumid and 

 snoutlike. First antenna 5-segmented. Second antenna 4-segmented 

 with a single terminal claw. Mouthparts lichomolgid. Legs 1 and 2 

 with 2-segmented rami. Leg 3 reduced to two setae. Leg 4 repre- 

 sented by a single seta. Leg 5 consisting of thi'ee setae, without a free 

 segment. 



Male. — Body elongated and rather vermiform. wSegment of leg 

 1 fused with head. Urosome 5-segmented in immatm-e male, 6- 

 segmented in mature male. Caudal ramus reduced and lobate. 

 Rostrum as in female. First antenna 1-segmented. Second antenna 

 indistinctly 3-segmented. Labrum bulbous. Mandibles, paragnaths, 

 and first maxillae absent. Second maxilla a well-developed hook in 

 immature male, a minute spinous process in mature male. Maxilliped 

 1-segmented with clawlike tip in immature male, absent in mature 

 male. Legs 1 and 2 much reduced, with rami of one segment. Leg 3 

 represented by a single seta. Legs 4 and 5 absent. Leg 6 present. 



Other features as in the species described below. 



Living in madreporarian corals. 



Type and only known species: Rhynchomolgus cor alio philus, new 

 species. 



Gender masculine. 



Etymology. — The generic name is a combination of the Greek 

 words pi;7xos= snout, referring to the prominent rostrum, and /X0X70S = 

 sack made of leather. 



