474 Records of the Indian Museum. [Vol. XXIV, 



very much produced. The fourth pleopod of the male differs 

 from that of the type-species in having the penultimate joint of the 

 exopod of normal size and not unduly elongated. But the only 

 specimen has a look of immaturity about it, since the lobe on the 

 antenuule lacks the dense tuft of hairs characteristic of adult males. 

 It <s possible therefore that adult males may be found to agree 

 more closely with the type in the form of the fourth pleopods of the 

 male. 



Remarks. — This interesting species is a true Afromysis, differ- 

 ing from the type-species in the different form of the eye, the 

 more produced rostrum, the longer antennular peduncle and 

 shorter antennal scale and in the different form and armature of 

 the telson. 



Genus Prionomysis, nov. 



Antennal scale long and narrow, setose on both margins, 

 terminal joint distinct. 



Terminal joint of the palp of the second maxilla longer than 

 wide, without strong spines on its distal margin. 



First thoracic limb with a masticatory lobe on the second 

 joint of the endopod only ; tarsal joint of the remaining thoracic 

 limbs with two transverse articulations. 



Telson linguiform in shape, cleft at the apex, cleft furnished 

 with a pair of plumose setae but without spines, lateral margins 

 armed throughout their length by spines which increase in length 

 posteriorly and are arranged in a regular saw-like formation on 

 each of the apical lobes. 



Inner uropods with a dense row of spines on the inner margin, 

 extending from the statocyst to the apex ; outer uropods without 

 a distal joint, and without spines. 



Pleopods in the male as in the genus Leftomysis. Female 

 with three pairs of incubatory lamellae. 



Type : — Prionomysis stenolepis, sp. nov. 



Remarks. — This genus is most nearly allied to the genus 

 Leptomysis. It agrees with that genus in the form of the second 

 maxilla, antennal scale and pleopods of the male, but is distin- 

 guished at once by the form of the telson. 



At first I was disposed to refer the species to the genus Af- 

 romysis but the discovery of a second species of the latter, showing 

 the same peculiar form of the palp of the second maxilla as in the 

 type has led me to regard this character as of generic value. 



Prionomysis shows considerable resemblances to the genera 

 Doxomysis and Bathymysis, but again the form of the second 

 maxilla separates it. In Doxomysis and Balhymysis the terminal 

 joint of the palp of the second maxilla is broader than long, 

 expanded distally and armed with stout spines. In both genera, 

 too, the cleft of the telson is armed with spinules, whereas in 

 Prionomysis the cleft is smooth. In Doxomysis the masticatory 

 lobes on the endopod of the first thoracic limb are much more 



