1 91 4-] S. Kemp : Notes on Crustacea Decapod a. ^^ 



B. Mandible without incisor-process ; last three peraeo- 



pods abnormally slender ... ... ... Ligm- ^=Par- 



D vT Iiippolvte\. 



D. .NO arthrobranchiae at base of peraeopods. 



I. Mandible with palp [carpus of second peraeopods com- 



posed of six to eight segments]. 



A. Mandibular palp three-segmented ; supra-orbital spines 



of carapace ver\- large [incisor-process of mandible 

 present or absent] ... ... ... Alope. 



B. Mandibular palp two-segmented ; supra-orbital spines 



of carapace, if present, not very large [mandible with 

 incisor-process] ... ..." " \.. ... Spiroutoccuis. 



II. Mandible without palp. 



A. Mandible with incisor- process. 



I. Carpus of second peraeopods composed of si.x or 

 seven segments ; ultimate segment of antennular 

 peduncle with movable distal plate ... ... Tlior. 



II. Carpus of second peraeopods composed of only three 

 segments ; ultimate seg-ment of antennular 

 peduncle without movable plate (normal) ... Hippolvfc. 



B. Mandible without incisor-process. 



I. Carpus of second peraeopods composed of three 

 segments. 

 (1- No post-ocular spine on carapace ; carpus and 

 chela of first peraeopods short and stout, 

 dactyli of last three pairs normal. 



1. Form of body stout ; lateral process of basal 



antennular segment anteriorly rounded; 

 third maxillipedc with exopod ; epipods at 

 base of first three or four peraeopods ... Latrcutes. 



2. Form of body very slender ; lateral process of 



basal antennular segment anteriorly point- 

 ed ; third maxillipede without exopod ; no 

 epipods at base of peraeopods ... ... TozeuDta, 



b. A post-ocular spine on carapace : carpus and 

 chela of first peraeopods slender; dactylus of 

 last three pairs composed of a short basal 

 portion bearing a cluster of large teeth [third 

 maxillipede without exopod ; epipods at base 

 of first four peraeopods] ... ... Gelastocuris. 



II. Carpus of second peraeopods composed of many 

 segments. 

 (I. Abdomen bearing argespines dorsally and vent- 

 rally ; carapace with longitudinal lateral cari- 

 nae [exopod of third maxillipede present ?] ... Mimocaris. 

 b. Abdomen without large spines ; carapace without 

 lateral carinae. 



1. Third maxillipede with exopod ; epipods at 



ba.se of first four peraeopods, ultimate seg- 

 ment of antennal peduncle not abnormal in 

 size. 



a. I'pper antennular flagellum unequally bira- 



mous... ... ... ... Lvsiiiafa. 



0- I'pper antennular flagellum uniramous ... Hippolysniata. 



2. Third maxillipede without exopod ; no epipods 



at base of first four peraeopods , ultimate 

 segment of antennal peduncle abnormal in 

 size ... ... ... ... Mergula. 



As the literature dealing with the family is much scattered, I 

 have given, at the end of this paper, a list of the Indo-pacific 

 species with references. 



