360 LITHOTRYA NICOBARICA. 



L. scutis terga anguste obtegentibus : carina crista in- 

 terna tenui in parte superior e positd: rostro conspicuo, 

 squamarum sex subjacentium latitudinem aquante : lateri- 

 bus, superficie interna trianguld, squamarum septem sub- 

 jacentium latitudinem cequantibus. 



Scuta narrowly overlapping the terga : carina with a 

 slight central internal ridge in the upper part : rostrum 

 conspicuous, as wide as six of the subjacent scales : latera, 

 with their internal surfaces triangular, as wide as seven 

 of the subjacent scales. 



. Palpi square at their ends : mandibles with twice as 

 many pectinations between the first and second main 

 teeth, as between the second and third : maxillae slightly 

 notched, with the inferior angle slightly prominent : 

 caudal appendages more than twice as long as the 

 pedicels of the sixth cirrus. 



Timor ; Brit. Mus., (given by Cuvier to Leach) ; Nicobar Islands, accord- 

 ing to Keinhardt. 



Capitulum as in L. dorsalis. The teeth on the promi- 

 nent rims of the valves are small and approximate ; but 

 the specimen was much worn. 



Scuta, triangular, slightly overlapping the terga ; the 

 line of junction between these valves slightly sinuous, the 

 upper part of the tergal margin of the scuta being slightly 

 hollowed out, and the corresponding upper portion of the 

 margin of the terga being slightly protuberant. Inter- 

 nally, there is a considerable depression for the adductor 

 muscle ; and besides the usual knob at the rostral angle, 

 there is a trace of a knob at the baso-tergal angle. 



Terga, as seen internally, irregularly rhomboidal, end- 

 ing downwards in a blunt point, of which the two sides, 

 (neither being sensibly hollowed out,) stand at about an 

 angle of 45° to each other. Scutal margin, with the 

 upper part, (as above remarked,) slightly protuberant : 



Steenstrup for sending me a separate copy of the paper in question, written 

 in Danish. I believe I am right in identifying the specimen here described, 

 from Timor, with the species from the Nicobar Islands, named by Keinhardt, 

 L. Nicobar ica. 



