•28 



defiaing the branchial region superiorly is present only in the posterior part of 

 the carapace, and even there is indistinct. 



The median carina of the 2nd abdominal tergum is absent ; that of the 3rd 

 is hai'dly perceptible; that of the ith present only in the posterior two-thirds. 

 The 6th abdominal somite is as long as the telson. 



The outer antennnlar liagellum is nearly as long as the peduncle. 



The last pair of thoracic legs reach more than a dactylus-length beyond the 

 tip of the antennal scale : in the adult male there is notch in the posterior 

 border of the merns at its proximal end, the notch being bounded by a small 

 tooth (not a spine) beyond which there are no denticles ; nor is there any sub- 

 terminal lobe on the border of the ischium. 



The andricum is built like that of M. nioiioceros, but ends in a pair of 

 simple spouts each of which carries, near its middle, a longish filament. 



Thethelycum is concave like that of .1/. inonocero.s : its median lobe is 

 shaped like a figure of eight, the anterior portion being embraced between pro- 

 cesses of the antepenultimate thoracic sternum, the posterior portion being em- 

 braced by the flat crescent-shaped lateral lobes. 



This species very rarely attains a length of 5 inches. It is represented in 

 our collection by only 18 specimens, registered as follows : — 



: Karaclu. Karaclii Museum. 



b 9 



2738-39 



7 

 1383-85 



9 



4234 



~9~ 



3393 



10 



tiZ^ Penani'. F. Stoliczka. 



9 ° 



Off Gail jam, '23 fathoms. 



Off Amherst (G. of Martaban). 



Museum collectoi'. 



' Investigator." 



4478-80 

 9 



Iiidi!!. No history. 



1^ Madras Purcliased. 



9 



.5. Met.\peneus Lvsianass.\, (de Man). Plate IV., fig. U, lla-c. 



Penxus Lysiauassa, de Man. Jouni. I.inii. Soc. Zoo'l., xxii. 1S8S. p. 29). p'. xix. liv'. 1 : Xobili, Boll. Miis. 

 Torino, 1903, No. 455, p. 4 {iletapen:rus). 



This species comes very close to M. hrevlcorais, from which it is distin- 

 guished by the following characters : — 



The rostrum is shorter, in large individuals hardly reaching to the cornea, 

 ; and even in young individuals barely reaching the middle of the eyes : it forms 



