425 



posterior edge subangular above the middle, and very finely serrated. Eyes 

 large and convex, rounded triangular in form, with the anterior edge somewhat 

 insinuated, visual elements very conspicuous, pigment dark brown. Supei-ior 

 antennae nearly attaining half the length of the body, 1st joint of the peduncle 

 rather large, equalling in length the other 2 combined, and produced at the 

 end posteriorly to a spiniform projection, last joint very short and, like the 

 preceding one, edged inside with small calceolae, fiagellum considerably longer 

 tiian the peduncle, and composed of numerous (about 65) short articulations, 

 each having anteriorly a distinct calceola. Inferior antennae somewhat longer 

 than the superior, the last 2 joints of the peduncle nearly of equal length, 

 and provided posteriorly with slender setae, flagellum longer than the peduncle, 

 and composed of about 85 articrrlations carrying, like the 2 outer joints of 

 the peduncle, calceolse anteriorly. Gnathopoda powerfully developed, and 

 nearly of equal size, propodos in both pairs more than twice as long as the 3 

 preceding joints combined, and oblong oval in form, palm slightly arched, 

 and defined posteriorly by a distinct obtuse projection armed with several 

 spines, dactylus elongated and evenly curved. Pereiopoda moderately slender, 

 basal joint of penultimate and antepenultimate pairs rather small, and having 

 the ]iosterior edge produced above the middle to an acute triangular projection; 

 last pair somewhat exceeding half the length of the body, and having the 

 basal joint rather broad in its proximal part, with the posterior edge angular 

 above the middle and produced below to an acuminate corne]-. Last pair of 

 uropoda with the inner ramus somewhat longer than the outer, both narrowly 

 lanceolate in form, and densely edged with spinules. Telson conically tapering 

 distally, and likewise densely edged with small spinules, cleft occupying about 

 Vs of the length of the telson, terminal lobes acuminate. Colour, as noted 

 in a 3'oung specimen collected at Hasvig, Fiumark, ' rather gorgeous, the 

 body being variegated all over with brown, orange, and pure white, 

 gnathopoda tinged with a beautifril carmine. Length of adult female 

 reaching 30 mm. 



Remarks. — This magnificent form was described as early as in the 

 year 1778 by Lepechin as OniscKs acnleafu.s, and subsequently recorded by 

 Owen under another name, viz., Aminldthoi; Edwardsii. Goes restored the older 

 specific name of Lepechin, and referred the species to the genus Amphithonoim 

 of Costa. It is a very distinct species, and easily recognizable both by its 

 large size and by its spiny armature and greatly produced rostrum. The 

 foj-m described by the author at an earlier date, from a solitary specimen, as 

 Tritroins avirosfris,! now find is nothing else than a young one of the present 

 species, in which, by some accident, the rostrum had become deformed in a 

 peculiar manner. 



